Technical Data Grade 21 - Silicone Coated Glass Fabrics Grade Nominal Thickness mm Nominal Weight g/m² Operating Temp C Nominal Tensile Strength N/cm Standard Width m Remarks 21 Grades 21-17 0.17 300 220 1.0 21-17R 0.17 300 250 1.0 RED 21-22 0.22 270 220 1.0 21-22R 0.22 270 250 1.0 RED 21-25 0.25 400 220 1,1.5 21-25R 0.25 400 250 1,1.5 RED 21-34 0.34 500 220 1,1.5 21-34R 0.34 500 250 1,1.5 RED 21-35 0.35 560 220 1,1.5 21-35R 0.35 560 250 1,1.5 RED 21-56 0.56 220 1,1.5 21-56R 0.56 250 1,1.5 RED Back