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

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.