... for dust-free room, ceiling boards; ad industry: halftone printing, computer lettering, ad scutcheon, exhibition board, remark board; industrial application: ... surface density, g/cm3 0.5-0.8, tensile strength, MPa 12-20, bending strength, MPa 12-18, elastic modulus in bending, ... 45-50 water absorption, % ≥1.5, Vicat softening point, °C 73-76 fire-retardant performance, self-extinguishing period is less ...