ABSTRACT
Introduction 779
The International SPF Test Method 782
The UV Light Source 784
Volunteer Selection 790
Product Application Procedure 791
Use of Standard Products 792
UV Exposure Procedure 793
Minimum Erythemal Dose Definition and Determination 794
SPF Calculation and Statistical Acceptance/Rejection Criteria 795
Comparison of the International SPF Test
Method and the US FDA SPF Method 798
SPF Labeling Guidelines 798
Water Resistance Testing and UV-A Measurement 803
Acknowledgments 805
References 805
INTRODUCTION
Sun products have been a way of life for many years with some leading brands
dating back as far as the 1940s, 1930s, or even the 1920s. However, products
from this era provided somewhat limited sunburn protection and were rarely
labeled with any reliable measure of their protective efficacy.