Home › Chemicals › Phosphoric Acid CAS 7664-38-2: Phosphoric Acid (H3PO4) Identity CAS Number 7664-38-2 Molecular Formula H3PO4 IUPAC Name phosphoric acid Molecular Weight 98.0 g/mol SMILES OP(=O)(O)OSynonyms orthophosphic acid, triphosphic acid, H3PO4
2D Structure
Physical Properties Density 1.885 g/mL at 25°C Boiling Point 158.0°C Melting Point 42.4°C Flash Point None°C Vapor Pressure 0.0003 kPa at 20°C Refractive Index nD = 1.435 Dielectric Constant ε = 22.0
Safety & GHS Classification GHS05 Irritant
H314: Causes severe skin burns and eye damage H302: Harmful if swallowed Storage: Store in acid-resistant containers. Hygroscopic — keep tightly sealed. Keep away from bases and strong oxidizers. Less corrosive than mineral acids but still requires PPE.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Good NBR Fair EPDM Good Silicone Good FKM Good
Metals Material Rating Stainless 316 Excellent Aluminum Fair Copper Good Brass Good
Applications Fertilizer production (phosphates) Food additive (E338 — acidulant in cola drinks) Rust removal and metal passivation Dental etchant Water treatment (scale inhibitor) Pharmaceutical buffer solution Semiconductor etching External References: PubChem
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