AMA's visible light (400-700nm) testing method designates protection capabilities via in-house generated Visible Light Protection Factor (VIS-PF) calculated from spectrometric measurements performed over the 400-700nm spectral range.
Finally, a test method has been developed for evaluating the Infrared Protection Factor (IRPF) of topical skin care/sun care products. AMA notes that infrared radiation has long been considered harmless, however it has recently been identified as a major contributor to photodamage and photoaging.
The in-vitro method is patterned after current ISO & FDA regulatory standards. A final in vitro and/or in vivo report will be issued at the conclusion of the study, signed and dated by all relevant staff scientists. The report will designate IR protection capabilities via an in-house generated factor and interpolated to percentage protection as a function of transmission values obtained during spectroradiometric measurements of the test material. In-vitro testing designates infrared protection capabilities via in-house generated factor and interpolated to percentage protection as a function of transmission values obtained during spectroradiometric measurements. AMA can perform spectroradiometric measurements over the range of 700-1440nm (IRA) as well as over the range of 700-2500nm (IR).
In contrast, AMA's in-vivo testing addresses immediate visible biological response of skin exposed to IR radiation (before any permanent damage may occur). The visible response (erythema) is acquired and evaluated using Matched Scientific Photo Analysis (PhotoGrammetrix).
More info: AMA Laboratories, Tel: 845-634-4330; Website: www.amalabs.com.