The ASTM has made their product category rules (PCR) document Clay Brick, Clay Brick Pavers, and Structural Clay Tile available for for public comment through March 4, 2016 on their website.

"With the proliferation of green measurement systems and labels, there is a growing need to understand the true impact of a product on the environment. Environmental product declarations (EPD) provide quantifiable environmental data to compare products that fulfill the same function. In order to create comparable EPD, they must follow the same rules and guidelines called product category rules (PCR)."

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