... board bonded between two sheets of high-impact polystyrene or white card paper. It is also flatness, light-weight, rigid and ... durable, water proof, moisture proof, good heat preservation, sound insulation and so on. ... protection.Specification:NameGradeWidth And Length(mm)Thickness±1(mm)ColorPearl boardA≤1220,limitless5,10Whitespecialinkjet boardAspecialcard board ARed, Yellow ...