Does the aging evidence establish destruction after storage?

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.