Rastra is an insulated concrete form system made of a mixture of recycled foam plastic and cementitious binder called Thastyron. It has been sold over 9 million units worldwide over 45 years. Rastra walls are structurally strong, provide energy savings and sound insulation, and are resistant to fire, moisture, pests and mold. Rastra was developed in Europe over 45 years ago and is produced under strict quality control standards.