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Section: Testing > Sun Protection

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The Best Sunscreen? The One People Will Use.

This guest advisor commentary comes from regular Cosmetics & Toiletries contributor and photochemistry expert Craig Bonda, president of Inception Partners, LLC, and technical consultant to the sunscreen industry.

Testing Sun Protection Factor on Skin

There are various test methods set by global governing bodies for SPF protection, but this article will discuss the five time-point internationally approved ISO 24444 method.

UV Transmission Assessment: Influence of Temperature on Substrate Surface

This work evaluates the impact of temperature on test substrate surfaces during the application, spreading and drying steps of the in vitro method to measure ultraviolet (UV) transmission. The authors work in a range between 20°C and 35°C, and demonstrate that controlling temperature is a key test parameter that should be strictly controlled to ensure reliability.

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Combing Through Sun and Pollutant Effects on Hair

Trefor A Evans, Ph.D., institute fellow at TRI Princeton and long-time C&T scientific advisor, offers his insights on the latest developments in hair science and what they mean to the cosmetic formulator.

Influence of Pressure During Spreading on UV Transmission Results

This work evaluates the impact of applied pressure during sample spreading on the in vitro measurement of UV transmission. The authors work in a range of pressures between 50–200 g and demonstrate that pressure control is a key parameter that should be strictly controlled to ensure the reliability of test results.

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Influence of Pressure During Spreading on UV Transmission Results

This work evaluates the impact of applied pressure during sample spreading on the in vitro measurement of UV transmission. The authors work in a range of pressures between 50–200 g and demonstrate that pressure control is a key parameter that should be strictly controlled to ensure the reliability of test results.

UV Transmission Assessment: Influence of Temperature on Substrate Surface

This work evaluates the impact of temperature on test substrate surfaces during the application, spreading and drying steps of the in vitro method to measure ultraviolet (UV) transmission. The authors work in a range of temperatures, between 20°C to 35°C, and demonstrate that controlling temperature is a key parameter and should be strictly controlled to ensure reliability.

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Photostability Leads the Way: Formulating Safer Sunscreens

The need to prevent skin from UV damage is well-understood but the most effective way to achieve this is not. Here, a novel photostabilizer is presented in a test pump sunscreen spray formula as part of a total photoprotection strategy.

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Guiding Sunscreen Traffic Across the Globe

Sunscreens are classified and regulated differently around the world. For instance, the United States considers sunscreens as OTC products, while Canada has a two-part classification system; other places classify sunscreens as cosmetics. Labeling and registering differ worldwide as well. In some cases, labels require certain Drug Facts or safety registration numbers, among others. This article reviews these differences.

Determination of the In Vitro SPF

A ring test at six European test centers showed that SPF evaluations with good reproducibility and comparability could be obtained by an in vitro protocol measuring either transmittance or erythema-effective irradiance of product samples applied on PMMA plates.

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SPF Testing: Who's Got Their 'Backs?'

"Isn’t it time for governments and industry to standardize an in vitro SPF test to replace human testing?" Karl Laden, Ph.D., of Alpa Cosmetics, asks in this brief commentary. What do you think?

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Effective Sunscreens for Everyone Under the Sun

Today, we take the effectiveness of sunscreen products for granted. As the industry knows, this performance is not simply a happy coincidence. Here, we review the steps in the sun care R&D process and consider where questions may arise.

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SPF Debate Puts Derms to the Test

Is the word we're spreading about sunscreen efficacy wrong? A new paper in the Journal of the American Medical Association thinks so. It holds that SPF values above 30 do make a difference.

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Future Testing, Safety and Formulating Headline the Sunscreen Symposium

"I am convinced the earth-shattering event [in sunscreens] will eventually become the greater awareness for the big difference between SPFindoor and SPFoutdoor," writes Uli Osterwalder, regarding new findings at this year's Sunscreen Symposium.

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Sunscreen Data Requests, Misperceptions and the Public Health Crisis

"The FDA is not saying 40% of sunscreens (or whatever) do not meet its rules for safety and effectiveness—not to the extent the EWG is suggesting." But the FDA also is muddying the waters, according to PASS Coalition adviser Michael Werner.

Wise Words From the Bench with Gavin Greenoak

After 25 years in the industry, Gavin Greenoak, managing and scientific director of the Australian Photobiology Testing Facility Pty., Ltd. (APTF), continues to strive for a better understanding of the interaction of light and the human body. Greenoak’s career began in cancer research, which has afforded him unique insight of skin biology and the effects of sun exposure.

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Here Comes the Sun Protection: ISO Test Methods

Our knowledge of the sun and its effects on skin has increased over the years, including the damaging effects of UVA and UVB light. Testing methods for UVA and UVB rays differ; the following is a review of the testing protocols of the European Union and United Kingdom. (Click through to the Digital Edition)

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Improving the UV Exposure of Sunscreen During In vitro Testing

In any sun protection evaluation method, an irradiation step is required to determine the photostability of the UV filters in a product. The aim of this study was to identify key parameters involved to improve this UV exposure. Here, the authors consider temperature at the substrate surface, air flow influence and beam uniformity during UV exposition.

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