The 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 features:Heat-resistant, corrosion-resistant, well-ventilation, water preservation, poisonless, odorless, low hardness, burning-avoidness, etc2.Silver ...