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CALCIUM PYROPHOSPHATE CAS# 7790-76-3

Flexible Preparation Methods
Can be produced by both solid-state reaction and aqueous precipitation, allowing adaptable manufacturing processes for different application needs.

Controllable Crystal Phases
Exhibits distinct α and β crystal forms at different temperatures, enabling phase control for specific performance requirements.

Stable Chemical Properties
Insoluble in water but soluble in dilute acids, providing good stability during storage and reliable behavior in various formulations.

Thermal Decomposition Capability
Decomposes at high temperature into useful phosphate compounds, making it suitable as a precursor in high-temperature and chemical processing applications.

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Product Details

Calcium Pyrophosphate CAS#7790-76-3

Calcium Pyrophosphate (Ca₂P₂O₇, MW 254.14 g/mol) can be prepared by heating dibasic orthophosphate or by precipitating a soluble calcium salt with pyrophosphoric acid. The solid-state method forms an amorphous product at 240–500 °C, while different crystal phases appear at higher temperatures: β-phase above 750 °C and α-phase between 1140–1350 °C.

The aqueous method produces the dihydrate form, Ca₂P₂O₇·2H₂O, a white powder that is insoluble in water but soluble in dilute acids. When heated to 1353 °C, the anhydrous compound decomposes into metaphosphate and calcium oxide.

Calcium Pyrophosphate is dimorphic, and the high-temperature α-phase can revert to the β-phase at about 950 °C during reheating.

CALCIUM PYROPHOSPHATE CAS# 7790-76-3

CALCIUM PYROPHOSPHATE Chemical Properties

Melting point	1230 °C
density	3.09 g/mL at 25 °C(lit.)
solubility	H2O: insoluble(lit.)
form	Powder
Specific Gravity	3.09
color	White
Odor	at 100.00?%. odorless
Water Solubility	Soluble in hydrochloric acid and nitric acid. Insoluble in water.
Cosmetics Ingredients Functions	ABRASIVE
	ORAL CARE
	LIGHT STABILIZER
LogP	-3.420 (est)
CAS DataBase Reference	7790-76-3(CAS DataBase Reference)
EPA Substance Registry System	Diphosphoric acid, calcium salt (1:2) (7790-76-3)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	26-36
WGK Germany	3
TSCA	TSCA listed
HS Code	28353100
Hazardous Substances Data	7790-76-3(Hazardous Substances Data)

Product Application of Calcium Pyrophosphate CAS#7790-76-3

Calcium Pyrophosphate is applied in the manufacture of phosphoric acid and fertilizers. It functions as the acidic component in baking leavening systems and is also used in processed cheese products. In addition, this compound has been utilized in cell gene transfection and in the development of contrast agents.

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CALCIUM PYROPHOSPHATE CAS# 7790-76-3