[{"from": "human", "value": "What can you tell me about this molecule? [F]"}, {"from": "gpt", "value": "The molecule appears as a colorless fuming liquid boiling at 67 \u00b0F. Shipped as a liquid confined under its own vapor pressure. Corrosive to metals and tissue. Very short contact with fumes or small quantities of the liquid can cause severe, painful burns. Vapors are heavier than air. Density 8.2 lb / gal. Used as a catalyst and raw material in chemical manufacture.   Rate of onset: Immediate & Delayed  Persistence: Minutes to hours  Odor threshold: 0.4 ppm  Source/use/other hazard: Aluminum and other metal industries; insecticide manufacturing-corrosive liq."}]