Borax Diboron Trioxide ( B2O3) % e 30 Granularity: 2� 4mm % e 90% Name: Borax Sodium tetraborate, pentahydrate Molecular Formula: Na2B4O7� 5H2O CAS NO.: 1303-96-4 Molecular Weight: 291.37 Appearance: White pellet. Odorless, taste salty. It will loss all the crystal water at 380 . Soluble in water, glycerol, slightly soluble in alcohol and the aqueous solution is alkalescence. It can slow weathering in the air. Melting into a colorless glassy material. Borax has bactericidal effect, but oral intake will harmful to people. Usage: It used for fertilizer.