This GC derivatization reagent, also known as HMDS, presents as a colorless to almost colorless liquid. It is known to be miscible with ether and benzene. Keep in a cool, dark and well-ventilated place. Store under inert gas and protect from moisture, as this substance is moisture sensitive. 1,1,1,3,3,3-Hexamethyldisilazane is incompatible with oxidizing agents and strong acids. This highly flammable liquid and vapor is harmful if swallowed and toxic in contact with skin or if inhaled. It causes severe skin burns and eye damage and is harmful to aquatic life with long lasting effects. This substance causes damage to the nervous system and may cause respiratory irritation, drowsiness or dizziness.