It is made of fine basalt melted with an amount of resin and then solidified . The advantages are fire proof , low heat and sound insulation and high  chemical , construction and ship-marking, and ideal , economic for heat insulation . water_proof products has non-water affinity of above 98%. Beause of no F and CI, it does no harm to equipment. The products include board, blanket, outer-tube and belt.

Standard GB/T11835-96 DL/L766-2001