Provides low cost bi-directional partial radiant heat protection and insulation not available with ceramics. Features Accepted by the GSA and AHJ's across the country as a safe and value added alternative to traditional unsafe wired glass and expensive ceramics. Meets the highest human impact safety requirements. Approved for 20 minute applications without limitations. Regularly specified for use in exterior applications and perfect for property line requirements. Acoustical value of 33 STC and available in specialty architectural make-ups. 10 year warranty. USA manufactured for fast delivery and competitive pricing.