Phosphoric Acid
- Acids
- CAS 7664-38-2
- IUPAC: phosphoric acid
Corrosive at concentrations above 10% (H314 — skin burns and eye damage). In consumer-diluted wheel cleaner formulas (typically 2–8%), corrosivity is reduced. Signal word DANGER at concentrate; WARNING at diluted consumer-use concentrations.
Phosphoric acid is the active acidic agent in most rust converters and many wheel cleaners. At concentrations above 10%, it is corrosive and requires appropriate PPE (H314). In consumer-diluted wheel cleaner formulas (typically 2–8%), corrosivity is reduced but H302 and H290 still apply at concentrate handling stage.
## Regulatory status
- Not listed under California Prop 65
- Not restricted under EU REACH
- Widely used in food-grade applications (E338) at high purity grades
Health & environment profile
- VOC
- no
- Prop 65 listed
- no
- Asthmagen
- no
- EPA Safer Choice
- no
- Aquatic toxicity
- no
- Biodegradable
- yes
- Bioaccumulative
- no
- Persistent
- no
- Ozone depleting
- no
- Microplastic
- no
- PFAS
- no
- Env. score
- 4/5
No products on file contain this (yet)
Health summaries are editorial — we synthesize from SDSs, peer-reviewed sources, and regulatory listings. Not medical advice.