murphyPhosphoric Acid
AKA: 7664-38-2, ORTHOPHOSPHORIC ACID, O-Phosphoric acid, Wc-reiniger, Acidum phosphoricum, Sonac, Phosphorsaeure, Evits, Acide phosphorique
Synthetic
Acid
Clean
OriginPhosphoric acid is produced from phosphate rock, a mineral containing calcium phosphate deposits, or synthesized from elemental phosphorus. It is manufactured through the sulfuric acid process, where sulfuric acid reacts with phosphate rock to extract phosphoric acid.
Phosphoric Acid is a colorless, odorless phosphorus-containing inorganic acid. Phosphoric acid is a sequestering agent which binds many divalent cations, including Fe++, Cu++, Ca++, and Mg++. Phosphoric acid is used in dentistry and orthodontics as an etching solution, to clean and roughen the surfaces of teeth where dental appliances or fillings will be placed. In addition, phosphoric acid is a constituent in bone and teeth, and plays a role in many metabolic processes.
Solubility Miscible (NIOSH, 2024)
Formula
H3O4P
Mol. Weight
98.00
CAS #
7664-38-2
Form
Liquid
State
Phosphoric acid appears as a clear colorless liquid or transparent crystalline solid. The pure solid melts at 42.35 °C and has a density of 1.834 g / cm3. Liquid is usually an 85% aqueous solution. Sh
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Buffering
Stabilizes pH
Antioxidant Protection
Locks In Moisture
Fights Bacteria
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing (CIR 710)
Mixed Skin Irritation Results
15 studies / 11 irritating / 1 mixed / 3 not irritating / reactions mild to corrosive (CIR 710)
Mixed Eye Irritation Results
6 studies / 5 irritating / 1 not irritating / reactions slight to corrosive (CIR 710)
Concentration Guide
Leave-on0.000004–1.2%
Rinse-off0.00005–9%
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR