Physical aging and unusual environments

Does permanent polarity specify the replacement interval of a finished filter?

Permanent describes the property of the material, and it is not a service life for a finished product.

NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The polarity is a positive electric charge at rest. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request. The Terms of Use state that, as of their effective date, the Water, Textiles, Food packaging, and Medical devices chapters describe Research Applications, and that they do not describe finished products currently available from C-POLAR for those uses.

The filter has service limits, and they are printed on it. The label states when to replace it: at the pressure drop or the replacement interval printed on it, whichever comes first. The label also instructs: “Do not wash, vacuum, brush, blow out or reuse this filter.” The label states: “Results in a building depend on the system, the airflow, and how well the filter fits its track.” NanoFlashing™ is a technology; the name, rating and sale of a product that carries it are set by that product's maker and seller.

Source: C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/; C-POLAR — Terms of Use, section 4, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.1 to 2.3; NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

Does the aging evidence establish destruction after storage?

The ageing record the company can cite on organisms is a contact test on fabric after accelerated ageing, and its laboratory reported no significant deterioration; it is not a storage test on a finished filter, and the Validation page lists 2 years of storage among the conditions tested.

The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” Two numbered reports the company can cite cover ageing. Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021, tested a spunlace nonwoven against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with reference to BS EN ISO 20743:2013 (transfer method), after accelerated ageing to ASTM F1980-16 for 64 days at 60 °C, and reported: “No significant deterioration of antimicrobial activity was observed after accelerated aging”. It is a contact test on fabric, not an air-filter or airborne result. The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021, measured bacterial filtration efficiency on a spunlace nonwoven by a method modified from ASTM F2101:2019, after accelerated ageing to ASTM F1980-16 equivalent to five years at room temperature. Bacterial filtration efficiency is a measure of what the medium holds back, and it says nothing about what happens to what it holds. It is a result for that nonwoven, not for a finished filter. On the Validation page the viruses are SARS-CoV-2, human coronavirus 229E, Coxsackievirus B6, bovine coronavirus, pseudo-type SARS-CoV-2, influenza A H3N2 and Phi6 bacteriophage; the bacteria are Staphylococcus aureus, Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa and Enterococcus faecalis; the fungi are Aspergillus fumigatus, Aspergillus brasiliensis, Aspergillus niger and Candida albicans.

The company's position on what the filter does to what it captures is this. The filter is intended to destroy the viruses, bacteria and fungal spores it captures. It destroys them on direct contact with the positive electric charge, by physical means, and only while the organism is captured by the positive electric charge.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., section 2.6; Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021; The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

What evidence supports any implication that the effect lasts for the lifetime of a finished product?

Permanent describes the property of the material, and it is not a service life for a finished product.

The Validation page states that ASHRAE 52.2 Appendix J tests electrostatic filters after their temporary charge is removed, and that NanoFlashing™ maintains MERV 15A performance under ASHRAE testing; it lists the conditions tested, among them a used filter for 1 year, after 2 years of storage and after 60C for 64 days. Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021, tested a spunlace nonwoven against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with reference to BS EN ISO 20743:2013 (transfer method), after accelerated ageing to ASTM F1980-16 for 64 days at 60 °C, and reported: “No significant deterioration of antimicrobial activity was observed after accelerated aging”. It is a contact test on fabric, not an air-filter or airborne result. LMS Technologies, Report 6847, 5 November 2024, rated a 24 × 24 × 30 in. pocket filter MERV 15A under ASHRAE 52.2-2017 with Appendix J; the rating belongs to that construction and is not a service life. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The polarity is a positive electric charge at rest. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request. The Terms of Use state that, as of their effective date, the Water, Textiles, Food packaging, and Medical devices chapters describe Research Applications, and that they do not describe finished products currently available from C-POLAR for those uses.

The filter has service limits, and they are printed on it. The label states when to replace it: at the pressure drop or the replacement interval printed on it, whichever comes first. The label also instructs: “Do not wash, vacuum, brush, blow out or reuse this filter.” The label states: “Results in a building depend on the system, the airflow, and how well the filter fits its track.”

Source: C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/; C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 4, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.1 to 2.3; NanoFlashing™ Air Filter label; LMS Technologies, Report 6847, 5 November 2024; Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

What storage and handling limits apply before the product is installed?

The label directs that the filter is stored flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture, with no loads stacked on the media, and that a filter whose media is torn, crushed, wet or visibly damaged is not installed.

The label instructs: “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The company publishes no temperature or humidity range for a particular installation; those limits are set by the partner who makes the finished filter.

Source: NanoFlashing™ Air Filter label; C-POLAR — Validation (https://cpolar.tech/validation/).

Reviewed on 21 September 2026.

What would an ordinary buyer understand permanent to mean about performance, maintenance and replacement, and what supports that understanding?

Permanent describes the property of the material, and it is not a service life for a finished product.

NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The polarity is a positive electric charge at rest. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request. The NanoFlashing™ page states: “Conventional electrostatic charges fade in service, dragging performance down with them.” It also states: “NanoFlashing™ does not fade.” The Validation page states: “Industry standards ASHRAE 52.2 Appendix J and ISO 16890 test electrostatic filters after their temporary charge is removed, showing how they perform without it.” It also states: “NanoFlashing™ maintains MERV 15A performance under ASHRAE testing”, and its pathogen section lists, among the conditions tested, “Used filter for 1 year”, “After 2 years of storage” and “After 60C for 64 days”. The Terms of Use state that, as of their effective date, the Water, Textiles, Food packaging, and Medical devices chapters describe Research Applications, and that they do not describe finished products currently available from C-POLAR for those uses.

The filter has service limits, and they are printed on it. The label states when to replace it: at the pressure drop or the replacement interval printed on it, whichever comes first. The label also instructs: “Do not wash, vacuum, brush, blow out or reuse this filter.” The label states: “Results in a building depend on the system, the airflow, and how well the filter fits its track.” NanoFlashing™ is a technology; the name, rating and sale of a product that carries it are set by that product's maker and seller.

Source: C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/; C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 4, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.1 to 2.3; NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

How would a user know that the product no longer meets a supported service condition or needs replacement?

The replacement point is printed on the product: a stated pressure drop or a stated interval, whichever comes first.

The NanoFlashing™ Air Filter label directs replacement when the pressure drop reaches the value printed on the product, or at the interval printed on it, whichever comes first, and directs that the system not be run with no filter in the track. It also directs that the filter not be washed, vacuumed, brushed, blown out or reused. A filter left in service past that point is outside the instructions it was supplied with. NanoFlashing™ is a technology; the name, rating and sale of a product that carries it are set by that product's maker and seller.

Source: NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

Does repeated condensation affect the treated material differently from steady high humidity?

The company publishes no result for condensation or for high humidity, and the label keeps the filter out of wet conditions.

The label states: “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” and “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” Its storage direction is: “Store flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. Do not stack loads on the media.”

Source: NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

Can freeze-thaw cycles damage a water-contact version of the material?

C-POLAR publishes no freeze-thaw result for a water-contact material.

Water is a research application.

The Terms of Use state that, as of their effective date, the Water, Textiles, Food packaging, and Medical devices chapters describe Research Applications, and that they do not describe finished products currently available from C-POLAR for those uses. They also state that a test of a material, component, sample, or prototype does not establish the safety, efficacy, suitability, durability, compatibility, manufacturability, scalability, or performance of a finished product. A housing, a cartridge and the pressure and temperature they are rated for belong to the manufacturer of that product.

Source: C-POLAR — Terms of Use, section 4, https://cpolar.tech/terms/.

Reviewed on 21 September 2026.

Does prolonged dry heat change the supporting fibres before it changes the treatment?

C-POLAR publishes no result that separates a change in the fibres from a change in the charge under dry heat; the heat condition the Validation page lists is after 60C for 64 days.

The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. Two numbered reports the company can cite cover ageing. Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021, tested a spunlace nonwoven against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with reference to BS EN ISO 20743:2013 (transfer method), after accelerated ageing to ASTM F1980-16 for 64 days at 60 °C, and reported: “No significant deterioration of antimicrobial activity was observed after accelerated aging”. It is a contact test on fabric, not an air-filter or airborne result. The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021, measured bacterial filtration efficiency on a spunlace nonwoven by a method modified from ASTM F2101:2019, after accelerated ageing to ASTM F1980-16 equivalent to five years at room temperature; bacterial filtration efficiency is a measure of capture, not of destruction. The Terms of Use state: “A reported result describes only what the identified test found.” A result covers the article, the conditions and the endpoint the report names, and nothing beyond them.

A cycle, a combination or an exposure that a named test did not run is not covered by it. The Terms of Use also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021; The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does sunlight affect exposed material differently from material inside a housing?

C-POLAR publishes no result for sunlight exposure.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Can prolonged contact with salt air alter the material or its frame?

C-POLAR publishes no result for salt air on the material or its frame.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Does repeated flexing change performance even when the sheet looks intact?

C-POLAR publishes no result for repeated flexing, and the label directs that the filter and its frame are not bent or folded.

The label states that the filter and its frame must not be cut, folded, trimmed, bent, punctured or altered, and that a filter whose media is torn, crushed, wet or visibly damaged must not be installed. General enquiries go to [email protected].

Source: NanoFlashing™ Air Filter label; C-POLAR — Terms of Use, https://cpolar.tech/terms/.

Reviewed on 21 September 2026.

Can compression during storage permanently reduce permeability?

C-POLAR publishes no result for compression in storage, and the label directs: “Do not stack loads on the media.”

The label for the NanoFlashing™ Air Filter sets the operating conditions: dry air only, at or below the rated airflow and maximum face velocity, with replacement at a stated pressure drop or after a stated interval, whichever comes first. The label instructs: “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” and “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” For storage it instructs that the filter is kept flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The company publishes no temperature or humidity range for a particular installation; those limits are set by the partner who makes the finished filter.

Source: NanoFlashing™ Air Filter label; C-POLAR — Validation (https://cpolar.tech/validation/).

Reviewed on 21 September 2026.

Does contact with common packaging foam alter the surface property?

C-POLAR publishes no result for contact with packaging foam.

The label for the NanoFlashing™ Air Filter sets the operating conditions: dry air only, at or below the rated airflow and maximum face velocity, with replacement at a stated pressure drop or after a stated interval, whichever comes first. The label instructs: “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” and “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” For storage it instructs that the filter is kept flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The company publishes no temperature or humidity range for a particular installation; those limits are set by the partner who makes the finished filter.

Source: NanoFlashing™ Air Filter label; C-POLAR — Validation (https://cpolar.tech/validation/).

Reviewed on 21 September 2026.

Can oils from handling transfer to the treatment and change its function?

C-POLAR publishes no result for oils transferred by handling.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Does vibration cause treatment loss independently of fibre breakage?

C-POLAR publishes no result for vibration.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Can static-discharge events change the material's measured properties?

C-POLAR publishes no result for static-discharge events.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Is shelf aging accelerated by repeated opening of the storage package?

C-POLAR publishes no result for a storage package opened again and again; the storage condition the Validation page lists is after 2 years of storage.

The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. Two numbered reports the company can cite cover ageing. Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021, tested a spunlace nonwoven against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with reference to BS EN ISO 20743:2013 (transfer method), after accelerated ageing to ASTM F1980-16 for 64 days at 60 °C, and reported: “No significant deterioration of antimicrobial activity was observed after accelerated aging”. It is a contact test on fabric, not an air-filter or airborne result. The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021, measured bacterial filtration efficiency on a spunlace nonwoven by a method modified from ASTM F2101:2019, after accelerated ageing to ASTM F1980-16 equivalent to five years at room temperature; bacterial filtration efficiency is a measure of capture, not of destruction. The Terms of Use state: “A reported result describes only what the identified test found.” A result covers the article, the conditions and the endpoint the report names, and nothing beyond them.

A cycle, a combination or an exposure that a named test did not run is not covered by it. The Terms of Use also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021; The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does a wet material recover its original performance after drying?

The company publishes no result for a filter dried after wetting, and the label directs that a filter whose media is wet is not installed.

The label states: “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” and “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” Its storage direction is: “Store flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. Do not stack loads on the media.”

Source: NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

Can an uninstalled filter be damaged by storage near solvents?

C-POLAR publishes no result for storage near solvents.

The label for the NanoFlashing™ Air Filter sets the operating conditions: dry air only, at or below the rated airflow and maximum face velocity, with replacement at a stated pressure drop or after a stated interval, whichever comes first. The label instructs: “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” and “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” For storage it instructs that the filter is kept flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The company publishes no temperature or humidity range for a particular installation; those limits are set by the partner who makes the finished filter.

Source: NanoFlashing™ Air Filter label; C-POLAR — Validation (https://cpolar.tech/validation/).

Reviewed on 21 September 2026.

Are temperature-cycle effects different from exposure at a constant temperature?

C-POLAR publishes no temperature-cycle result; the heat condition the Validation page lists is after 60C for 64 days.

The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. Two numbered reports the company can cite cover ageing. Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021, tested a spunlace nonwoven against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with reference to BS EN ISO 20743:2013 (transfer method), after accelerated ageing to ASTM F1980-16 for 64 days at 60 °C, and reported: “No significant deterioration of antimicrobial activity was observed after accelerated aging”. It is a contact test on fabric, not an air-filter or airborne result. The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021, measured bacterial filtration efficiency on a spunlace nonwoven by a method modified from ASTM F2101:2019, after accelerated ageing to ASTM F1980-16 equivalent to five years at room temperature; bacterial filtration efficiency is a measure of capture, not of destruction. The Terms of Use state: “A reported result describes only what the identified test found.” A result covers the article, the conditions and the endpoint the report names, and nothing beyond them.

A cycle, a combination or an exposure that a named test did not run is not covered by it. The Terms of Use also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Hong Kong Metropolitan University, Test Report IRITS202112110001, 11 December 2021; The Open University of Hong Kong, Test Report IRITS2020007030001R1, 7 June 2021. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does treatment on a cut edge behave differently from treatment within the sheet?

C-POLAR publishes no result for a cut edge, and the label directs that the filter and its frame are not cut, trimmed or altered.

The label states that the filter and its frame must not be cut, folded, trimmed, bent, punctured or altered, and that a filter whose media is torn, crushed, wet or visibly damaged must not be installed. General enquiries go to [email protected].

Source: NanoFlashing™ Air Filter label; C-POLAR — Terms of Use, https://cpolar.tech/terms/.

Reviewed on 21 September 2026.

Can layers stick together after long storage under pressure?

C-POLAR publishes no result for long storage under pressure, and the label directs: “Do not stack loads on the media.”

The label for the NanoFlashing™ Air Filter sets the operating conditions: dry air only, at or below the rated airflow and maximum face velocity, with replacement at a stated pressure drop or after a stated interval, whichever comes first. The label instructs: “Use in dry air only. Do not use in ducts carrying liquid water, steam or oil mist, or anywhere the media may become wet.” and “Do not install a filter whose media is torn, crushed, wet or visibly damaged.” For storage it instructs that the filter is kept flat or on edge in the original packaging, indoors and dry, away from direct sunlight and moisture. The conditions tested, listed on the Validation page, are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The company publishes no temperature or humidity range for a particular installation; those limits are set by the partner who makes the finished filter.

Source: NanoFlashing™ Air Filter label; C-POLAR — Validation (https://cpolar.tech/validation/).

Reviewed on 21 September 2026.

Does a visibly discoloured sample necessarily have altered performance?

C-POLAR publishes no result that links a colour change to performance.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Can apparently unchanged material fail a functional test after environmental stress?

C-POLAR publishes no result that links how the material looks after environmental stress to how it performs.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

How is cumulative exposure considered when several mild stresses occur together?

C-POLAR publishes no result for several stresses acting together.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Does the durability evidence cover repeated shipping between warehouses?

C-POLAR publishes no result for repeated shipping between warehouses.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request. NanoFlashing™ is a technology; the name, rating and sale of a product that carries it are set by that product's maker and seller.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.

Is a material rated for outdoor exposure or only protected indoor installation?

C-POLAR publishes no outdoor rating for the material.

The conditions listed on the Validation page are heavy dust loaded, fast air flow, used filter for 1 year, after 60 washes, after 2 years of storage, and after 60C for 64 days. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., sections 2.2 and 2.3.

Reviewed on 21 September 2026.