ASTM D 6603 is a consumer format recommended for visible hangtag and care labeling of sun protective clothing and textiles. A manufacturer may publish a test result to a maximum of UPF 50+.
The ASTM D 6603 standard provides the format for visible hangtags and care labels on sun-protective clothing and textiles. Manufacturers can report test results indicating UPF values of 50 or higher, adhering to this guideline.