Calcium pyrophosphate (Ca₂O₇P₂) is a chemical compound that can be formed by the reaction of pyrophosphoric acid

Pyrophosphoric acid

Pyrophosphoric acid, also known under the name diphosphoric acid, is colorless, odorless, hygroscopic and is soluble in water, diethyl ether, and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric...

 and a calcium base or by strongly heating calcium phosphate

Calcium phosphate

Calcium phosphate is the name given to a family of minerals containing calcium ions together with orthophosphates , metaphosphates or pyrophosphates and occasionally hydrogen or hydroxide ions ....

 or calcium ammonium phosphate.

It is commonly used as a mild abrasive agent in toothpastes.

Deposition of CPPD in articular joints causes an arthritis condition called pseudogout.

See also

• Calcium pyrophosphate deposition disease
  Calcium pyrophosphate deposition disease
  Calcium pyrophosphate dihydrate disease is a rheumatologic disorder with varied symptoms arising due to the accumulation of crystals of calcium pyrophosphate dihydrate in the connective tissues. It is more commonly known by alternative names that specify certain clinical or radiographic findings,...