Be Cool Solutions Polycarbonate Panel, Twin Layer 4mm Sheet, 5 Pack - 2' (W) X 4' (L) - Cold-Flexible, Clear, Strong Impact and Shatterproof - All-Weather Outdoor Garden and Greenhouse Covering

ThermaGlas 4mm twinwall clear polycarbonate are perfect for use as replacement panels for hobby greenhouses. These ThermaGlas polycarbonate panels offer 99.5% UV protection. The light weight and shatterproof multiwall design coupled with integrated UV resistant co-extruded layer yields long service periods backed up by a 10 year limited warranty. The cellular multi-layer structure reduces heating costs in winter while minimizing excessive heat in summer. A special coating on the bottom side eliminates condensation dripping. Blocks ultraviolet rays that burn plants and living tissues, and transmits only beneficial radiation. 4mm Thickness for double wall. 82% light transmission. Superb thermal insulation saves energy. 10 year limited warranty against UV degradation. Impact resistance virtually unbreakable. Approx. Weight: .16 lbs per sq. ft. Low flammability (available with CC1 rating). R-Factor: 1.49; U-Factor: 0.67.