Comment Gypsum? (Score 1) 98
Asbestos naturally occurs alongside gypsum. A federal law was made that any gypsum containing less than 1% asbestos can be labeled "asbestos free." For a long time, this was called "The Grace Rule," as lobbyists from Grace Construction sponsored the legislation. I can no longer find that phrase online, but I did find that in Osha standard 1926.1101(b) Definitions: it says "Asbestos-containing material (ACM), means any material containing more than one percent asbestos." So, it's worth thinking about the mass of all the drywall out there, and the notion that 0.9% of it could be asbestos, and the label would never mention that.