... pollution and no radiation. It can be reduced.2,Light weightAbout 36kg/-1/9th in weight of the traditional brick ... lightweight partition board is made of natural plant fiber , coal ash, cement , magnesium oxide and so on. It is a ... fire-proofing, sound-proofing, water-proofing, environmental protection, hignintensity,light quality,sound insulation,heat preservation and easy installation. Our product ...