... ,2-4mm,4-6mm 4.Use:Refractory material,construction crude silver vermiculite 1.Features Fireproof, heat insulating, sound and moisture absorbing ... weight, non-toxic, odorless, non-abrasive, etc.. 2.Size Golden/Silver Vermiculite1-3mm,2-4mm,3-8mm,4-8mm,10-20mesh ...