Meets ASTM C 1028 Sustainable & Innovative Products — SpecCeramics Applauds The Shift Towards Lower Impact Products And Practices Which May Include: Use Of Abundant All Natural Ingredients & Post-Industrial Recycled Materials; Recycling And Re-Use Of Water During Production; Non-Toxic Manufacturing; Energy Conservation, Recycling Programs & Environmentally Safe Packaging. Made With Up To 20% Recycled Content In Some Colors (See Brochure For Details).