... Antiknock characteristic 15. Certificate : ISO 9001:2000&CE 16. New light heat-preserving,siliceous 17. Brick Raw Material: Sand or ... concrete (polystyrene concrete) as core materials. It is a new wall with the function of safety and environmental protection, solid, light, ... the panels can easily cut, drilled, screwed when installing with fast speed due lightweight and precast.For more information on ...