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Phosphates and phosphorus salts

Calcium pyrophosphate (Ca2P2O7)

Also known as Calcium pyrophosphate, Dicalcium pyrophosphate, Diphosphoric acid, calcium salt

CAS 7790-76-3Formula Ca2O7P2Molar mass 254.10 g/molEC 232-221-5
GHS signal word: Warning. Pictograms: Harmful or irritant 28 suppliers listed
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Calcium pyrophosphate (Ca2P2O7) chemical structure, Ca2O7P2, CAS 7790-76-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Polymorphous crystals or powder
Melting point
1,353 °C
Density
3.09
Solubility
Sol in dil hydrochloric and nitric acids, practically insol in water
HS code
283539
Category
Phosphates and phosphorus salts
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Calcium pyrophosphate (Ca2P2O7)?

Plain description, key identifiers and synonyms

Calcium diphosphate is a calcium phosphate. It contains a diphosphate(4-).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dicalcium, phosphonato phosphate
CAS number
7790-76-3 CAS number cross-checkedOther or deprecated CAS: 10086-45-0, 1264298-55-6, 35405-51-7
EC number
232-221-5
Molecular formula
Ca2O7P2
UNII
X69NU20D19
MDL number
MFCD00015983
INCI name
CALCIUM CERIUM PHOSPHATE, CALCIUM PYROPHOSPHATE
InChIKey
JUNWLZAGQLJVLR-UHFFFAOYSA-J
InChI
InChI=1S/2Ca.H4O7P2/c;;1-8(2,3)7-9(4,5)6/h;;(H2,1,2,3)(H2,4,5,6)/q2*+2;/p-4
SMILES (canonical and isomeric)
[O-]P(=O)([O-])OP(=O)([O-])[O-].[Ca+2].[Ca+2]

Synonyms

  • Calcium pyrophosphate
  • Dicalcium pyrophosphate
  • Diphosphoric acid, calcium salt
  • Diphosphoric acid, calcium salt (1:2)
  • Calcium phosphate (Ca2P2O7)
  • Pyrophosphoric acid, calcium salt (1:2)
  • Diphosphate, Calcium
  • Pyrophosphate, Calcium
  • Pyrophosphate Dihydrate, Calcium
  • Monohydrate Calcium Pyrophosphate
  • Pyrophosphate, Monohydrate Calcium
  • Calcium diphosphate
  • dicalcium, phosphonato phosphate
  • Dicalcium diphosphate
  • Calciumpyrophosphate
  • Ca2P2O7
  • Calcium phosphate, amorphous
  • Calcium phosphate (pyro)
  • calcium phosphon
  • Ca2O7P2
  • Diphosphoric acid, dicalcium
  • dicalcium (phosphonatooxy)phosphonate
  • Calcium pyrophosphate (99.95%-Ca)
  • CALCIUM PYROPHOSPHATE, Ca2P2O7
  • Calcium pyrophosphate, tetrabasic (form i)
Show all 26 synonyms
  • Calcium pyrophosphate, tetrabasic (form ii)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Polymorphous crystals or powderexp.
Melting point
1,353 °Cexp.
Density
3.09exp.
Solubility
Sol in dil hydrochloric and nitric acids, practically insol in waterexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
254.10 g/molcalc.
Exact mass
253.8371 Dacalc.
LogP (octanol/water)
-4.1calc.
Topological polar surface area
135.6 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
7calc.
Rotatable bonds
2calc.
Heavy atoms
11calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Calcium pyrophosphate (Ca2P2O7) suppliers

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Where suppliers are based

28 suppliers in 8 countries

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Calcium pyrophosphate (Ca2P2O7) price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Abrasive, fertilizer, feed supplement, in dentifrices, ceramic ware, china, glass, phosphors.

Mild abrasive for metal polishing, nutrient and dietary supplement.

Used primarily as dental abrasives in fluoride-containing toothpastes.

Industrial uses: Abrasives.

Use classes: Food additives, Cosmetics.

Cosmetic ingredient, INCI name CALCIUM PYROPHOSPHATE(abrasive, oral care)

Functional uses

  • Abrasive
  • Flavouring and nutrient
  • Stabilizing agent

Cosmetic functions

  • Abrasive
  • Light stabilizer
  • Oral care

How it is made

By ignition of CaHPO4: St Pierre, J Am Chem SOC 77, 2197 (1955).

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • Food additive

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Calcium pyrophosphate (Ca2P2O7) is traded under.

HS 2835.39Indicative HS code

Polyphosphates, other

World exports in 2024
$983M
+0.1% vs 2023, imports $980M
2019 to 2024
Top exporters
  1. China35.2%
  2. Germany19.2%
  3. United States9.7%
Top importers
  1. United States10.2%
  2. United Kingdom6.1%
  3. France * partner reported4.5%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Calcium pyrophosphate (Ca2P2O7) is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Calcium pyrophosphate (Ca2P2O7), based on the data on this page

What is Calcium pyrophosphate (Ca2P2O7)?

Calcium diphosphate is a calcium phosphate. It contains a diphosphate(4-).

What is the CAS number of Calcium pyrophosphate (Ca2P2O7)?

The CAS registry number of Calcium pyrophosphate (Ca2P2O7) is 7790-76-3. Other or deprecated CAS numbers: 10086-45-0, 1264298-55-6, 35405-51-7.

What is the molecular formula and weight of Calcium pyrophosphate (Ca2P2O7)?

The molecular formula of Calcium pyrophosphate (Ca2P2O7) is Ca2O7P2 and its molar mass is 254.10 g/mol.

What is Calcium pyrophosphate (Ca2P2O7) used for?

Abrasive, fertilizer, feed supplement, in dentifrices, ceramic ware, china, glass, phosphors. Mild abrasive for metal polishing, nutrient and dietary supplement. Used primarily as dental abrasives in fluoride-containing toothpastes. Industrial uses: Abrasives. Use classes: Food additives, Cosmetics.

Is Calcium pyrophosphate (Ca2P2O7) hazardous?

Calcium pyrophosphate (Ca2P2O7) carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Calcium pyrophosphate (Ca2P2O7)?

Calcium pyrophosphate (Ca2P2O7) is usually classified under HS code 283539 (Polyphosphates, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Calcium pyrophosphate (Ca2P2O7)?

CompoundList lists 28 suppliers of Calcium pyrophosphate (Ca2P2O7) in China, United States, Japan, India and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Calcium pyrophosphate (Ca2P2O7) in India?

2 suppliers in India list Calcium pyrophosphate (Ca2P2O7) on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Calcium pyrophosphate (Ca2P2O7)?

Suppliers quote Calcium pyrophosphate (Ca2P2O7) on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Calcium pyrophosphate (Ca2P2O7)

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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