... vermiculite is crooked mineral as leech,it's formed,grown,weathered function or hot liquid alteration. Specifications1.Raw ... and unexpanded 2.Asbestos free 3.Silze:0.3-1mm,20-40mesh,40-60mesh 4.Origin:Tianjin,China 1.Silver Vermiculite ... , burning-avoidness, etc2.Silver vermiculite grades (size) Unexpanded silver Vermiculite grade(size) Vermiculite gradeVermiculite sizeExpansion ratioMicron 0.3- ...