silica powder specification details : 1.Application: Electrode Grade (Superfine)ï¼?Aviationï¼?Refractory. Fill ; Can be modified ; 2. Mesh: 200~2500M;(Ordinary Specifications ) 3. Whiteness: > 90 ( At your option ) silica powder size: Other requirement of chemical composition and size are available. Silica Powder Packaging & Shipping: 1.Packing : 25kg/bag ,then 1000kg/bag . 20-25mt/1x20 container . we can pack it customize. 2. Delivery : ordinary goods delivery . About Production standard and manage system: 1.production SJ/T 10675-2002. 2.ISO9001:2008 3.ISO14001:2004