... resist damp, mildew and water, as well as quakeproof. 5. PVC expansion boards are made of weatherable components, then the ... elongation at break, % 15-20, Shore Hardness, D type, 45-50 water absorption, % ≥1.5, Vicat softening point, °C 73-76 fire-retardant ... performance, self-extinguishing period is less than 5 seconds PVC expansion ...