Physical Properties Minimum Standards Metric Units Imperial Units Thickness Nominal 3.2mm 0.125 inch Tolerance ±0.3mm ±0.012 inch Density 1000 kg/m3 62 lbs/ft3 Internal Bond 1.2 N/mm2 174 psi Modulus of Rupture 40 N/mm2 174 psi Moisture Content 7% ±2 7% ±2 Thickness Swell (24 Hours) 25% max 25% max Water Absorption (24 Hours) 35% max 35% max