American Society for Testing and Materials (ASTM). Current edition approved Feb. 1, 2008. Published March 2008. Originally approved in 2002. Last previous edition approved in 2007 as F 2212 – 02 (2007). 14 p. This guide for characterizing collagen-containing biomaterials is intended to provide characteristics, properties, and test methods for use by producers, manufacturers, and researchers to more clearly identify the specific collagen materials used. With greater than 20 types of collagen and the different properties of each, a single document would be cumbersome.