Thastyron is a mixture of plastic foam and cementitious binder that is composed of eighty-five percent recycled post consumer polystyrene waste that is molded into blocks and panels.
Rastra is sustainable in its production because no energy is used in the curing process, and only one to three kilowatt hour (kWh) are required to make each >10sqft block.
[1] Rastra blocks come in different sizes, and can be easily cut with woodworking tools to form the desired shape.
BASF, a German chemical conglomerate, originally created this product, but found no successful applications.
[1] As a thermal barrier, Rastra has a four-hour fire rating with no flame spread and no smoke development.