Features Maximum fire and impact safety with hose stream and full radiant heat protection. Largest tested and approved sizes up to 4,876 sq.in. in standard 1-1/2" profile. Tint-free and optically clear. Perfect for property line requirements. Acoustical value of 44 STC. Available in custom architectural make-ups, such as laminated glass and energy-saving insulated units with NFRC certifications when used with GPX Architectural Series Framing. 5 year warranty. USA manufactured for fast delivery and competitive pricing.