• Oxidizing Chemical
  • Ammonium Nitrate
  • Hydrogen Peroxide
  • Nitric Acid

Home > Products > Acids > Phosphoric Acid

Phosphoric Acid

Other Names: Orthophosphoric Acid

Molecular Formula: H3PO4

UN No.: 1805

HS No.: 2809201900

CAS No.:  7664-38-2 

EINECS No.: 231-633-2  

Hazard Class: 8

Purity:  85% 

Appearance:  Colorless liquid 


Physical and Chemical Properties:

Appearance : Colorless transparent syrupy liquid, odorless.

Formula :H3PO4

Boiling Point : 158 deg C

Melting Point : 21 deg C

Vapour Pressure : N/A

Specific Gravity : 1.60 (water = 1)

Flash point :N/A

ph : <1()

Solubility in water : Sol. g/l (25 deg C)

Flammability Limits (as percentage volume in air)

Phosphoric acid, also known as orthophosphoric acid or phosphoric(V) acid, is a weak acid with the chemical formula H3PO4. It is normally encountered as a colorless, syrup of 85% concentration in water. The pure compound is a colorless solid.Phosphoric acid is commonly encountered in chemical laboratories as an 85% aqueous solution, which is a colourless, odourless, and non-volatile syrupy liquid. Although phosphoric acid does not meet the strict definition of a strong acid, the 85% solution can still severely irritate the skin and damage the eyes.

Grade Standard: Food Grade

Appearance/Transparent Colorless Sticky liquid
Assay as(H3PO4)%≥85.0
Arsenic as AsMg/kg≤0.5
Fluoride as FMg/kg≤10
Heavy metals as PbMg/kg≤5
Reductive Matter as H3PO4Mg/kg≤120


PackageDrum No.Net Weight per Drum Net Weight per 20'FCL
IBC Drum161600 KG25.6MT
330KG Drum80330 KG26.4MT
35KG Drum74035 KG25.9 MT


The dominant use of phosphoric acid is for fertilizers, consuming approximately 90% of production.Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas and jams, providing a tangy or sour taste. Soft drinks containing phosphoric acid, which would include Coca-Cola, are sometimes called phosphate sodas or phosphates. Phosphoric acid in soft drinks has the potential to cause dental erosion. Phosphoric acid also has the potential to contribute to the formation of kidney stones, especially in those who have had kidney stones previously.

Specific applications of phosphoric acid include:

●In anti-rust treatment by phosphate conversion coating or passivation

●As an external standard for phosphorus-31 nuclear magnetic resonance.

●In phosphoric acid fuel cells.

●In activated carbon production.

●In compound semiconductor processing, to etch Indium gallium arsenide selectively with respect to indium phosphide.

●In microfabrication to etch silicon nitride selectively with respect to silicon dioxide.

●As a pH adjuster in cosmetics and skin-care products.

●As a sanitizing agent in the dairy, food, and brewing industries.


Workers must be trained in handling phosphoric acid. Avoid breathing mist. Prevent contact with eyes, skin or clothing. Store 85% solution above 21 deg C, 81.5% solution above 7 deg C, 80% solution above 4 deg C and 75% solution above –20 deg C to prevent crystallization. Keep container tightly closed. Keep away from direct sunlight, alkalis, sulphides, cyanides and metal powders. Store in corrosion-proof ventilated area. Keep soda ash or lime in area for emergency use.


Accept inspection of any impartial third party,such as SGS,BV,ISO,CE,etc.

About Us

11 years’ experience on hazard chemical exporting,with annual production  tons.


---Timely Response Rate

---Technical Support

---Strong Packages Ensure Transport Safety

---Long-term and Stable Supply with different package size Available(Container,ISO,Tank,Bulk)

---High Purity