... ) Waterproof: Doesn't swell or deform in water 3) Volume weight: 0.85 - 1.27g/cm3 4) Strength: Bendable and impact ... layers such as wood, PVC, melamine, brick, stone, aluminium foil, etc.5) Weight is heavy, strenuous to carry, damage rate is high5 ... ) The board is crisp and heavy, damage rate is high5) Weight is low, easy to carry, damage rate is low6) Strength ...