Home › Chemicals › Hydrofluoric Acid CAS 7664-39-3: Hydrofluoric Acid (HF) Identity CAS Number 7664-39-3 Molecular Formula HF IUPAC Name hydrofluoric acid Molecular Weight 20.01 g/mol SMILES FSynonyms hydrogen fluoride, fluoric acid, HF
2D Structure
Physical Properties Density 1.15 g/mL at 25°C Boiling Point 19.5°C Melting Point -83.6°C Flash Point None°C Vapor Pressure 78.0 kPa at 20°C Refractive Index nD = 1.158 Dielectric Constant ε = 84.0
Safety & GHS Classification GHS05 GHS06 Health Hazard
H300: Fatal if swallowed H310: Fatal in contact with skin H314: Causes severe skin burns and eye damage H330: Fatal if inhaled H361: Suspected of damaging fertility or the unborn child Storage: EXTREME HAZARD — store in PTFE or HDPE containers only. Never store in glass (HF dissolves silica). Calcium gluconate gel must be immediately available. Even dilute HF penetrates skin and attacks bone — seek immediate medical attention for any exposure. Use in fume hood with full PPE.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Excellent NBR Good EPDM Excellent Silicone Good FKM Excellent
Metals Material Rating Stainless 316 Poor Aluminum Poor Copper Poor Brass Poor
Applications Glass etching and frosting Semiconductor wafer cleaning (buffered oxide etch) Petroleum alkylation catalyst Stainless steel pickling Uranium processing Fluorocarbon production Ceramic and metal surface treatment External References: PubChem
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