Cimic negative ion board is a new kind of decorate material, and it is made from plaster powder without sulphur, material of fiber calcium and silicon, a kind of expanded vermiculite which can can release a great deal of beneficial negative ion, thus, our board can improve the immunity and develop the intelligence, relieve and cure kinds of chronic disease..It could be applied to domestic and leisure location such as 1220*2440*5/6/9 27.5kg/30kg/45.5kg per piece 603*603*5/6/9 600*1200*14