Phosphoric Acid (H3PO4)

This is our most popular Phosphoric Acid (H3PO4) – Phosphoric Acid 85% (General Use)

Phosphoric Acid 85% (General Use)

From: £48.78

From: £48.78


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  • Custom packaging
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  • Different grades available

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Looking for Phosphoric Acid for General Use?

  • We supply phosphoric acid for general use in 2.5L and 25L containers, as well as 200L drums
  • Discounts available for bulk orders over 4 items
  • Full MSDS is also available to download from our website


Chemical and Physical Properties of Phosphoric Acid

  • Name: Phosphoric acid
  • Alternative names: Orthophosphoric acid
  • Molecular formula: H3PO4
  • Molecular weight: 97.996 g/mol
  • Appearance: Hygroscopic colourless crystals, forming a viscous solution in water
  • Odour and taste: Odourless but with an acid taste
  • Boiling point: 407°C (415°F)
  • Melting point: 42.4°C (108°F)
  • Solubility: Soluble in water, alcohol, and ether
  • Decomposition: Converts to pyrophosphoric acid (H4P2O7) when heated to over 200°C
  • Corrosivity: Corrosive to ferrous metals and alloys
  • Acidity: pH around 1.5 in aqueous solution (0.1N)


Common Uses of Phosphoric Acid

  • Manufacture of fertilisers (over 70%)
  • Manufacture of agricultural feeds
  • Water treatment
  • Used in soaps and detergents
  • Used in the food industry, including pet food and beverages
  • Used in cosmetic and personal hygiene products, in particular toothpastes
  • Manufacture of fire control products
  • Antifreeze
  • Used in the textile industry
  • Used as a catalyst
  • Used in the drilling industry
  • Rust removal


How Safe is Phosphoric Acid?

As an acid, phosphoric acid can be dangerous if not handled in a safe manner.

  • It’s not combustible but releases toxic fumes in a fire
  • If in contact with skin, it may cause chemical burns and blisters. It’s also an irritant to the eyes.
  • If inhaled or ingested, it causes a burning sensation in the throat and difficulties breathing. It can also result in abdominal pain and collapse.


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MSDS Files

The following files are available to download:

Product IDProductpost_statusBulkDownload SDS File
3569Phosphoric Acid 85% (General Use)publish1284 - 1284 - SDS10918.pdf

Our most popular product is displayed above. Other variants of this product are displayed below.

Where Can I Buy Phosphoric Acid in UK?

Phosphoric acid available to buy from trusted UK suppliers, ReAgent. Shop online today where we sell phosphoric acid in a variety of pack sizes, from 2.5L containers to 200L drums and 1000L IBCs.

With discounts available on bulk orders, a promise of 24 hour shipment, and a 100% quality guarantee on all products, buying phosphoric acid has never been easier. Visit our online shop today or contact us to speak with a member of our expert team.

What is Phosphoric Acid?

Phosphoric acid, also known as orthophosphoric acid, is a colourless and viscous liquid mineral acid. It is also entirely odourless. In its pure form, phosphoric acid is a crystalline solid, although it is rarely distributed in this form. Highly concentrated phosphoric acid is classed as a corrosive. However, it is easily diluted and is classed as non-toxic when mixed with water.

The alternative term, orthophosphoric acid, is sometimes used in order to distinguish it from related phosphoric acids known as polyphosphoric acids.

What is Phosphoric Acid Used For?

Phosphoric acid has many uses both in a laboratory and in real world situations. It has proven medicinal uses in dentistry and orthodontics, and it is also commonly found in soda products as an additive. Phosphoric acid is also used in:

  • Anodizing solutions
  • Electrolytes for phosphoric acid fuel cells
  • Removal of rust by conversion of iron oxide into ferric phosphate
  • In food preparation, where it is numbered as additive E338
  • A flux as an aid to soldering
  • Plant fertilisers
  • Anti-nausea medication
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