GLAVEL transforms municipal waste glass into a sub-slab insulation material and high-grade aggregate.

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To produce Glavel, processed recycled glass shards are ground into a powder and mixed with a foaming agent. This mixture is deposited on a mesh that slowly passes through a furnace. The powdered glass is heated to a temperature of 1650°F, which causes the glass powder to foam into a mass of 9.4 lbs./cf – 150kg/m3. It then cools and hardens into foam glass. The final product has a closed cell structure and has a compressive strength above 40PSI. As the foam glass tumbles off the conveyor it breaks up into smaller pieces and the result is foam glass gravel.