... .6-2.5mm or 3-8mmProperties1. Molecular sieve for powder crystal, metallic luster, hardness is 3 ~ 5, relative density is ... a lot of specific surface area, 300 ~ 1000m2 / g, inside the crystal surface height polarization, for pyrethroids adsorbent, also is kind of ... solid acid, the surface has high acid concentration and acid intensity, can cause ...