... anti-moisture, noise-resistant and heat insulation. Melamine Sponge 1, factory direct sell, professional manufacturer2, soft, ... by demand4,shapes by demand5,size by demand6,density by demand7, colors by demand.8, ... (Imperial) Test MethodDensity (Core) 29 kg/m3 (1.8 lb/ft3) ASTM D1622Compressive Strength 186 ... Strength 241 kPa (35.0 psi) ASTM D1623Open Cell Content 8.0% ASTM D2856Water Absorption 1.2 ...