... anti-ageing 5,reduce maintenance costs as a new type of green product, its appearance is concise and easy,using ... cement, quartz sand, gravel, compound system of the block,the chemical fiber accumulation of acupuncture molding, felt, and then put themat ... , adapt toclimate, durability strong, not because solvents and the functions of water andsoften or expansion, to acid and alkali strong stability ...