Calcium pyrophosphate

CAS Number
7790-76-3
EC Number
232-221-5
Abbreviation
CPP

What is Calcium pyrophosphate?

Calcium pyrophosphate (CAS 7790-76-3), also known as dicalcium diphosphate and abbreviated as CPP, is an inorganic calcium salt.

Where is Calcium pyrophosphate used?

  • Oral care: polishing and abrasive agent in toothpaste formulations
  • Food: acidity regulator and leavening component in processed foods, baked goods, and dry mixes
  • Pharmaceutical solid dosage forms: calcium supplement excipient and diluent in tablet manufacturing
  • Personal care: specialty powders and cleansing products requiring mild mechanical action
  • It functions as an acidity regulator, buffering agent, and mild abrasive.

Good to know: Provides controlled enamel cleaning without excessive surface wear. Particularly useful where pH stability during processing is critical.

Commercial specifications

  • White, fine powder in varying particle sizes
  • Bulk quantities in multi-kilogram bags or supersacks
  • Smaller packaging for laboratory and development-scale procurement

Other Names (Synonyms)

diphosphoric acid, calcium salt (2:1)|Dicalcium diphosphate (acidity regulator)|Ca2P2O7|Dicalcium pyrophosphate|Diphosphoric acid, calcium salt (1:2)|Calcium phosphate (Ca2P2O7)|Diphosphoric acid, calcium salt|Pyrophosphoric acid, calcium salt (1:2)|CPP

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What are the physical properties of Calcium pyrophosphate?

Melting Point 1353 °C
Density 3.09 g/cm³
Appearance white powder
Color White
Odor Odorless
Form Powder
Water Solubility Soluble in hydrochloric acid and nitric acid. Insoluble in water.
Log P -3.420 (est)

How is Calcium pyrophosphate classified and handled safely? Learn More

Warning
GHS07· Irritant

Hazard Statements

H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation

Precautionary Statements

P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.

Which trade and regulatory codes apply to Calcium pyrophosphate?

HS Code 28353100
Storage Class 11 - Combustible Solids
WGK (Germany) 3
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