Phosphotungstic Acid 69% ACS

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Price: £24.95

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Stock Availability

On Shelf - Approx. UK delivery date: Thursday the 05th February 2026*

In bulk stock - ships within 10 - 12 Working Days (Excluding weekends and public holidays)

4 to 6 weeks approx. (Not guaranteed)

UK Shipping

Unfortunately, we are not currently accepting orders for Northern Ireland, Jersey and Guernsey.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed

Applications

Laboratory Chemical
Negative Stain for viruses
Component of Biological Stains

General

Phosphotungstic acid is used in histology as a component for staining of cell specimens, often together with haematoxylin as PTAH. It binds to fibrin, collagen, and fibres of connective tissues, and replaces the anions of dyes from these materials, selectively decoloring them.Phosphotungstic acid is electron dense, opaque for electrons. It is a common negative stain for viruses, nerves, polysaccharides, and other biological tissue materials for imaging by a transmission electron microscope.

Specification

Minimum Assay 69%
Molecular Formula H3PO4 x (WO3)12 x H2O
Molecular Weight 2880.05 g/mol
Melting Point ~95 °C
Insoluble Matter: Complies
Chloride (Cl): <0.30%
Nitrate (NO3): <0.10%
Sulphate (SO4): <0.020%
Ammonia (NH3): <0.2%
Iron (Fe): <0.002%
Heavy Metals (as Pb): <0.005%
Copper (Cu): <0.00012%
Potassium (K): <0.0048%

Hazards

Hazard Phrases: Causes severe skin burns and eye damage.

Prec Phrases: Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER or doctor/physician.

corrosive CLP Image