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SPF
New in SPF (page 1 of 2)
Mar 01, 2012 | 04:37 PM CST
New method to Reproduce In vitro Cosmetic Product Photostability Findings
By: Marc Pissavini, PhD, Adeline Baud, Stéphanie M…
The present article describes a reproducible method for determining the photostability of sunscreen products. This method is based in part on the in vitro determination of the UVA protection factor as proposed by Colipa for the irradiation aspect, and on the spectroscopy of a sunscreen in dilute solution for the absorbance measurement aspect.
Jan 26, 2012 | 02:37 PM CST
Science Exposed—What Should the Minimum Recommended SPF Be to Avoid Sunburn?
By: Brian Diffey, PhD DSc, Newcastle University, U…
“Science Exposed” is a new column aimed at digging into industry controversies to strip them down to the scientific facts. Here, sun protection expert Brian Diffey, PhD DSc, critiques the current SPF test method.
Aug 16, 2011 | 05:55 PM CDT
Comparatively Speaking: SPF and Calculated SPF
By: Anthony J. O'Lenick Jr., Siltech LLC; and Denn…
In order to prepare the industry for the upcoming Sunscreen Symposium, organized by the Florida chapter of the Society of Cosmetic Chemists, industry expert Tony O’Lenick asks Dennis Lott to explain the difference between SPF and calculated SPF. This is the first of two columns on sun protection.
Mar 02, 2011 | 03:58 PM CST
Interpretation of SPF In vivo Results: Analysis and Statistical Explanation
By: Marc Pissavini and Olivier Doucet, Coty-Lancas…
Methods for determining SPF in vivo are based on a biological response by human skin. To overcome intrinsic variation in these methods, large numbers of volunteers and statistics are required; however, these concepts are often poorly understood or worse, misinterpreted. This article discusses how these values should be interpreted and explains what they mean to formulators.
Mar 02, 2011 | 03:53 PM CST
Adapting SPF Testing Methods for Mineral Sunscreen Density
By: Paul G. McCormick, University of Western Austr…
A sunscreen layer’s thickness is critical to its SPF. However, current regulations specify a mass application rate for testing, rather than a volumetric application rate. This significantly underrates the SPF values of mineral sunscreens due to their higher densities since, compared with their relative organic counterparts, thinner films are being tested, as will be shown here.
Aug 28, 2009 | 04:05 PM CDT
Characterizing Roughness: A New Substrate to Measure SPF
By: M. Pissavini, S. Marguerie, A. Dehais, L. Ferr…
Here, the authors describe a variable that affects the results of SPF testing in vitro—the roughness parameter—and investigate this variable using standard and molded poly(methyl methacrylate) (PMMA) substrates. They conclude that use of a molded substrate, along with the described control chart, improves the reproducibility of in vitro SPF test results.
Jul 01, 2009 | 10:58 AM CDT
Cutest Offers UVA Sunscreen Testing
Cutest Systems Ltd has installed a Labsphere UV-2000S sunscreen analyzer at the companies laboratories in Cardiff, Wales.
Apr 08, 2008 | 01:43 PM CDT
Analytical Device Raises the Bar on UVA-PF
A new UV transmittance analyzer has been designed to exceed Colipa's UVA protection factor (UVA-PF) requirements to support the development of higher protection factor sunscreens.
Feb 05, 2008 | 08:13 AM CST
Research Pathways to Photostable Sunscreens
By: Craig Bonda, The HallStar Company
This article provides a visual depiction of pathways that UV filters undergo when exposed to solar radiation; such pathways often lead to photo-instability. A fluorescence technique is described that has led the author to identify compounds that preserve photostability in a novel manner— by quenching the UV filter’s singlet excited state.
Oct 01, 2007 | 05:03 PM CDT
In Vitro and In Vivo Offered for Sunscreen Testing
Laboratoire Dermscan and HelioScreen Labs are combining their skills to offer a complete new in vitro / in vivo service in the field of sunscreen testing.