ASTM standards - are developed and approved by experts of the American international standardization organization, which prepares and publishes international standards for all fields of activities and services - product production, process control, service delivery or material delivery.
The American Society for Testing and Materials was originally founded as a society for testing materials and products in 1898, and later became one of the most important publishers of standards worldwide.

ASTM standards can be downloaded in .PDF format or ordered in print. Most of these American Standards are also available in a Redline PDF version, this version compares the changes between the previous (i.e. already withdrawn) and the current (valid) edition of the standard.