Phosphotungstic Acid 69% ACS (Tungstophosphoric acid )


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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.

  • Laboratory Chemical
  • Negative Stain for viruses
  • Component of Biological Stains

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%

Hazard Class: 8

Packing Group: 2

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.

Cas No: 12501-23-4
Einecs No: 215-682-7


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