Astm: Norma

A group of engineers and scientists formed the (ASTM). Their first standard was for steel rails. Over the next century, the organization dropped "American" from its name to become ASTM International , reflecting its global reach. Today, it is headquartered in West Conshohocken, Pennsylvania, and serves over 140 countries.

These provide general information or recommendations without a strict pass/fail criterion. norma astm