... -4mm,4-6mm 4.Use:Refractory material,construction crude silver vermiculite 1.Features Fireproof, heat insulating, sound and ... -toxic, odorless, non-abrasive, etc.. 2.Size Golden/Silver Vermiculite1-3mm,2-4mm,3-8mm,4-8mm,10-20mesh ... Size/specifications can be customized. 3.Physical& Chemical AnalysisChemical Composition: CompositionSiO2MgOAl2O3Fe2O3CaOK2OPercentage37-4311-239-175-181-25.5-7 Physical ...