... flat and smooth,not easy to deformation,stable performance Uniform material quality,dense lamellar structure,the surface flat and ... 5)AdvantageUniform material quality,dense lamellar structure,the surface flat and smooth,not easy to deformation,stable performance,the edge ... non-radiation and good air permeability.Good thermal insulation performance,not aging and strong adhension.6)GradeAAA, AA,7 ...