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Phosphates and phosphorus salts

Phosphorus pentoxide

Also known as Phosphorus(V) oxide, diphosphonate, Phosphorus (V) pentoxide

CAS 1314-56-3Formula O5P2Molar mass 141.94 g/mol
70 suppliers listed
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Phosphorus pentoxide chemical structure, O5P2, CAS 1314-56-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
1314-56-3
Formula
O5P2
Molar mass
141.94 g/mol
HS code
280910
Category
Phosphates and phosphorus salts

What is Phosphorus pentoxide?

Plain description, key identifiers and synonyms

Diphosphonate(2-) is a divalent inorganic anion obtained by removal of both protons from diphosphonic acid. It is a phosphorus oxoanion and a divalent inorganic anion. It is a conjugate base of a diphosphonate(1-).

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
1314-56-3Other or deprecated CAS: 337913-25-4, 72906-42-4
Molecular formula
O5P2
MDL number
MFCD00011440
INCI name
PHOSPHORUS PENTOXIDE
InChIKey
YWEUIGNSBFLMFL-UHFFFAOYSA-N
InChI
InChI=1S/O5P2/c1-6(2)5-7(3)4
SMILES (canonical and isomeric)
O=P(=O)OP(=O)=O

Synonyms

  • Phosphorus(V) oxide
  • diphosphonate
  • Phosphorus (V) pentoxide
  • diphosphonate(2-)
  • Phosphorus oxide (P2O5)
  • Diphosphorpentaoxid
  • Phosphorus (V) oxide
  • P2H2O5(2-)
  • mu-oxido-bis(hydridodioxidophosphate)(2-)
  • [O2P(H)OP(H)(O)2](2-)

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
141.94 g/molcalc.
Exact mass
141.9221 Dacalc.
LogP (octanol/water)
1.18calc.
Topological polar surface area
77.51 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
2calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Phosphorus pentoxide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 70 suppliers
30 of 30 offers

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Where suppliers are based

70 suppliers in 14 countries

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Phosphorus pentoxide price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Cosmetic ingredient, INCI name PHOSPHORUS PENTOXIDE(buffering, chelating)

Functional uses

  • Catalyst
  • Chelating agent
  • Flame retardant
  • pH regulating agent

Cosmetic functions

  • Buffering
  • Chelating

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

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 Phosphorus pentoxide is traded under.

HS 2809.10Indicative HS code

Diphosphorus pentaoxide

World exports in 2024
$48.1M
+10.1% vs 2023, imports $52.2M
2019 to 2024
Top exporters
  1. China64.6%
  2. Netherlands12.1%
  3. France * partner reported10.0%
Top importers
  1. Germany20.2%
  2. Spain16.7%
  3. United States13.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Phosphorus pentoxide, based on the data on this page

What is Phosphorus pentoxide?

Diphosphonate(2-) is a divalent inorganic anion obtained by removal of both protons from diphosphonic acid. It is a phosphorus oxoanion and a divalent inorganic anion. It is a conjugate base of a diphosphonate(1-).

What is the CAS number of Phosphorus pentoxide?

The CAS registry number of Phosphorus pentoxide is 1314-56-3. Other or deprecated CAS numbers: 337913-25-4, 72906-42-4.

What is the molecular formula and weight of Phosphorus pentoxide?

The molecular formula of Phosphorus pentoxide is O5P2 and its molar mass is 141.94 g/mol.

What is Phosphorus pentoxide used for?

Known uses and roles of Phosphorus pentoxide include builders and chelants in home care and cleaning, buffering, chelating, catalyst, chelating agent and 2 more.

Is Phosphorus pentoxide hazardous?

No GHS hazard classification for Phosphorus pentoxide is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Phosphorus pentoxide?

Phosphorus pentoxide is usually classified under HS code 280910 (Diphosphorus pentaoxide). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Phosphorus pentoxide?

CompoundList lists 70 suppliers of Phosphorus pentoxide in United States, China, Germany, India and 10 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Phosphorus pentoxide in India?

4 suppliers in India list Phosphorus pentoxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Phosphorus pentoxide?

Suppliers quote Phosphorus pentoxide 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 Phosphorus pentoxide

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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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