1.biggest factoty 2.competitive price 3.Heat, sound insulation 4.passed CE, SGS,excellent quality Rockwool As one of the biggest suppliers on this business in China, in our own factory, we produce high quality rockwool products with CE and SGS Certificates. Our factory can produce many shapes of rockwool products: Cold insulation rock wool, Sound absorbing rock wool, Ceiling rock wool, Sprung ...