If you’re working with (like TPO or PVC), you’ve probably heard of UL 2431 . This is the crucial Underwriters Laboratories standard for "Factory Applied Roof Adhesive and Adhesive Systems for Flashing and Seaming."
For three months, Julian had been refurbishing the old industrial generator he’d salvaged from a bankrupt steel mill. It was a beast of a machine, capable of powering a small neighborhood, but it was missing one critical component: the sealant specs for the chemical storage tank. The original schematics had been lost to water damage, and without the specific chemical resistance rating, the whole project was a very expensive bomb waiting to go off. ul 2431 pdf download free