... for Insulation - high & low temperature,Seed germination, Rooting cuttings etc.SpecificationSize1-3mmBulk Density150-190kg/m3AppearanceWell-proprtioned golden yellowVermiculite is the ... times: 6-9); expanded vermivulite (including 0.3-1mm, 1-3mm, 2-4mm, 3-6mm etc.), vermiculite board and so on. If there ... best service. Looking forward to your inquiries. vermiculite (0.3-1mm, 1-3mm, 2-4mm, 3-6mm etc.)