Clear Patterned Solar GlassThickness:  3.2mm, 4.0mmApplications: Cover glass for solar thermal collectors / solar water heaters                Roofs and walls of Greenhouse projects●MIGO Clear Patterned Solar Glass, also called normal iron patterned glass or clear textured solar glass, refers to 3.2mm or 4.0mm Normal-iron Mistlite Tempered Glass. It is featured with a prismatic pattern on one side and a matt pattern on the other side.●MIGO Clear Patterned Solar Glass is fully tempered as per EN12150. Toughening  (tempering) treatment makes the glass four to five times stronger and safer than original glass.  TECHNICAL SPECIFICATIONSLight Transmittance3.2mm (1/8"): 90%;  4.0mm ( 5/32"): 88%Thickness tolerance   ±0.2mmDimension tolerance           ±1.0mmDiagonal difference            ≤0.1-0.2%Iron content (Fe2O3)                  3.2mm (1/8"): 498ppm;  4.0mm ( 5/32"): 594ppmOverall Bow/warp             ﹤0.2%Local warp                   ≤ 0.3mm / 300mmFragmentation Test   ≥79 particles within 50x50mmMECHANICAL & THERMAL CHARACTERISTICSScratch hardness 4~5 Poisson's Ratio 0.2 Density 2.5×10³ kg/m³ Tensile Strength 42N/mm2 Pressure resistance 700-900N/mm² Four Point Bending Test ≥146.7N/mm² Coefficient of thermal conduction ≤ 1.36 W/(m*K)