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Collaborative development of a sun protection factor test method: a proposed European Standard. COLIPA Task Force

J Ferguson¹, M Brown, D Alert

¹Boots Contract Manufacturing, Nottingham, UK.

International Journal of Cosmetic Science

|February 28, 2009

Summary

Standardizing sun protection factor (SPF) testing is crucial for uniform product labeling. The new COLIPA SPF Test Method, developed by industry experts, ensures consistent and reliable SPF measurements across Europe.

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Area of Science:

Cosmetic Science
Dermatology
Analytical Chemistry

Background:

Standardization of sun protection factor (SPF) determination is essential for consistent product labeling.
The COLIPA Task Force 'Sun Protection Measurement' (SPM) was formed in 1990 to address this need.
Existing SPF testing methods required critical appraisal and improvement.

Purpose of the Study:

To develop and validate a standardized SPF test method for sun products.
To improve the reliability and objectivity of SPF measurements.
To facilitate uniform SPF labeling in Europe and globally.

Main Methods:

Critical review of existing SPF testing protocols.
Development of a new recommended test protocol by participating laboratories.
Validation through two multicentred ring tests involving cosmetic formulations and physical filters.
Incorporation of objective assessment options, such as colorimetry, for erythemal threshold determination.

Main Results:

The developed COLIPA SPF Test Method was confirmed through ring tests.
Variations in cosmetic product SPF were proportional to the SPF value.
An excellent correlation (r = 0.99) was observed between visual and colorimetric SPF assessments.
Acceptable value ranges for standard products (SPF 4-20) were established.

Conclusions:

The COLIPA SPF test method is fully defined and experimentally supported.
Implementation of this method will harmonize SPF testing across Europe.
This standardization aids the global effort for consistent sun product testing.