... Density (OZ/ft², g/m²) Standard Width (inch) M10 13 Silane Polyester < 0.20 1.0/300 38, 50, 60 M15 ... 13 Silane Polyester < 0.20 1.5/450 38, 50, 60 M20 ... 13 Silane Polyester < 0.20 2.0/600 38, 50, 60 M30 ... 13 Silane Polyester < 0.20 3.0/900 38, 50, 60 Special ...