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Phosphorus pentoxide

Outline Risk category Hazardous characteristics Reference quality standards Reaction with water Toxicity Water absorption Chemical Properties Uses Production method Category Toxicity grading Acute toxicity Flammability hazard characteristics Storage Characteristics Extinguishing agent Occupational standards
Phosphorus pentoxide
Phosphorus pentoxide structure
Chemical Name:
Phosphorus pentoxide
P2-O5;NA 1807;SICAPENT;GRANULATED;SICAPENT(R);Phosphoricoxide;EATON'S REAGENT;PHOSPHORUS OXIDE;Phosphoric oxide;Phosphorpentoxid
Molecular Formula:
Formula Weight:
MOL File:

Phosphorus pentoxide Properties

Melting point:
340 °C(lit.)
Boiling point:
122 °C (1 mmHg)
2.3 g/mL at 25 °C(lit.)
vapor density 
4.9 (vs air)
vapor pressure 
1 mm Hg ( 384 °C)
refractive index 
Flash point:
storage temp. 
Store at RT.
Soluble in sulfuric acid. Insoluble in acetone and ammonia.
Very Deliquescing Powder
Specific Gravity
1 (5g/l, H2O, 20℃)
Water Solubility 
Soluble in sulfuric acid. Insoluble in acetone and ammonia. Decomposes in water.
Moisture Sensitive
340-360 ºC
Stability Stable, but reacts violently with water, alcohols, metals, sodium, potassium, ammonia, oxidizing agents, HF, peroxides, magnesium, strong bases.
CAS DataBase Reference
1314-56-3(CAS DataBase Reference)
NIST Chemistry Reference
Diphosphorus pentoxide(1314-56-3)
EPA Substance Registry System
Phosphorus oxide (P2O5)(1314-56-3)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  C
Risk Statements  35
Safety Statements  22-26-45
RIDADR  UN 1807 8/PG 2
WGK Germany  1
RTECS  TH3945000
HS Code  2809 10 00
HazardClass  8
PackingGroup  II
Hazardous Substances Data 1314-56-3(Hazardous Substances Data)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
Precautionary statements:
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P310 Immediately call a POISON CENTER or doctor/physician.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Phosphorus pentoxide price More Price(33)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 214701 Phosphorus pentoxide ReagentPlus , 99% 1314-56-3 1kg $126 2018-11-13 Buy
Sigma-Aldrich 214701 Phosphorus pentoxide ReagentPlus , 99% 1314-56-3 6x1kg $498 2018-11-13 Buy
Alfa Aesar 010524 Phosphorus(V) oxide, ACS, 98% min 1314-56-3 *4x500g $284 2018-11-16 Buy
Alfa Aesar 010524 Phosphorus(V) oxide, ACS, 98% min 1314-56-3 50g $32 2018-11-16 Buy
Strem Chemicals 93-1548 Phosphorus(V) oxide, 98+% (ACS) 1314-56-3 500g $119 2018-11-13 Buy

Phosphorus pentoxide Chemical Properties,Uses,Production


Also known as phosphoric anhydride, phosphorus pentoxide is phosphorus oxides generated by combustion of white phosphorus, yellow or red phosphorus in dry air, soft white powder or colorless monoclinic crystal at room temperature, easily deliquescence, melting point is 580~585 ℃, relative density is 2.39, sublimation is 347 ℃. When heated under pressure to 563 ℃, crystalline substance translates to amorphous glass (melt). It is insoluble in acetone, ammonia, soluble in sulfuric acid. It is easy to absorb moisture in the air, easy to absorb moisture, and have a strong dehydration, can even dehydrate concentrated sulfuric acid to produce sulfur trioxide, is a potent desiccant, reacts violently with water and emits heat and white smoke. Per mole of phosphorus pentoxide releases 68 kilocalories, usually generate metaphosphate with cold water, and generate mainly phosphoric acid with hot water. According to the amount of water added, it can generate different pentavalent phosphorus oxyacid, such as metaphosphoric acid, pyrophosphoric acid, orthophosphoric acid, etc. It is used to make high purity phosphoric acid, as well as gas and liquid desiccant, organic synthetic dehydrating agent.

Risk category

Class 8.1 acidic corrosive product

Hazardous characteristics

Non-combustible. But encountering water and organic materials such as wood, cotton or straw, it reacts violently to release heat, may cause a fire. Contacting Water, it can emit a lot of smoke and heat. The case of the moisture, it corrodes most metals slightly. A strong local irritation, vapor with dust can severely irritate the eyes, mucous membranes, skin and respiratory system, and corrode the skin, mucous membranes. Even the dust concentration of 1mg/m3, it is unbearable.
The above information is edited by the chemicalbook of Yan Yanyong.

Reference quality standards

Item Index
Chemically pure analytically pure specific level
Content (phosphorus pentoxide) ≥99% ≥99.5% ≥99.5%
Active R value 1.2 1.7 2.0
Reducing substances (in terms P2O3) ≤0.02% ≤0.01% ≤0.005%
Clarity test Pass Pass Pass
Water insoluble matter ≤0.02% ≤0.01% ≤0.01%
Total nitrogen (N) ≤0.002% ≤0.001% ≤0.001%
Heavy Metals (in Pb) ≤0.002% ≤0.001% ≤0.001%
Iron content (Fe) ≤0.002% ≤0.001% ≤0.001%
Arsenic content (As) ≤0.01% ≤0.005% ≤0.0025%

Reaction with water

It reacts with cold water to produce extremely toxic metaphosphate: P2O5 + H2O = 2HPO3
and reacts with hot water to produce ontoxic orthophosphate: P2O5 + 3H2O = (heating) 2H3PO4, an exothermic reaction, the phenomenon is not very intense.


Phosphorus pentoxide smoke irritates mucous membranes, has irritation and burning effects for skin (tissue dehydration).
Maximum allowable concentration is 1mg/rn3.
Production equipment and pipelines should be closed, and maintain good ventilation. Production workers should wear labor protective equipments and wear protective respirator, when there are phosphorus pentoxide vapor and smoke , should wear protective masks. Pay attention to protect the skin, do not import, or meet the eye. If accidentally touches the skin, immediately wash with clean water.

Water absorption

There is a strong water imbibition, and easily deliquescent in the air, corrosive to the skin. The maximum allowable concentration in the workplace is 1mg/m3. The drying efficiency of Phosphorus pentoxide is 1 cubic meter 0.00001 grams of water vapor content at 298K, namely dried by phosphorus pentoxide, water left per cubic meter of air is up to 0.00001 gram, phosphorus pentoxide can make sulfuric acid, nitric acid dehydration. When the amount of phosphorus pentoxide and water substance is 1: 6, phosphorus pentoxide can convert to orthophosphoric acid.

Chemical Properties

White monoclinic crystal or powder. Dissolved in water to produce phosphoric acid and release a lot of heat, dissolved in sulfuric acid. Insoluble in acetone and ammonia.


Used as a drying agent, dehydrating agent, sugar refining agent, and used for the preparation of phosphoric acid, phosphorous compounds and aerosol, etc. Used as a semiconductor silicon doped source, dehydration drying agent, organic synthetic condensing agent and surfactant, it is also used for preparation of high purity phosphoric acid.
It is used as raw material for the production of high purity phosphoric acid, phosphates and phosphate, also used for the preparation of phosphorus pentoxide sol and H-based aerosol. It can be used as a desiccant of gases and liquids, dehydrating agent for organic synthesis, antistatic agents of synthetic fiber and sugar refining agent. It is also used in the manufacture of optical glass, UV transparent glass, insulating glass, microcrystalline glass and opaque glass, etc, so as to improve the dispersion coefficient and UV light through ability of the glass. Also used in the production of pharmaceuticals, pesticides, surfactants.
It is used as the semiconductor dopant, and raw material for the preparation of high purity phosphoric acid.
It is used as desiccant and dehydrating agent, condensing agent in organic synthesis. High purity grade phosphorus pentoxide can be used as dopant for drawing optical fiber preform, N type dopant for the manufacture of integrated circuits, used for the synthesis of optical crystal.

Production method

Reagent grade phosphorus pentoxide is as raw material, purified by burning sublimation in sufficiently dry oxygen gas stream, trapping sublimate by the condenser, to obtain high-purity phosphorus pentoxide products.
Yellow phosphorus is heated and melted by oxidation method, transfered to the oxidation furnace for oxidation combustion reaction with dry air (via dehydration of concentrated sulfuric acid), phosphorus pentoxide produced is sublimated by heat, cold in the top of burners and falls into interior settling chamber at the bottom, to prepare pentoxide products.
Exhaust escapes from the oxidation furnace to a cyclone to recover phosphorus pentoxide dust. Recycling and the settling chamber finished product are together packaged as a finished product. P4 + 5O2 → 2P2O5


Corrosive materials

Toxicity grading

Highly toxic

Acute toxicity

Inhalation-rat LC50: 1217 mg/m3/1 hour, Inhalation-Mouse LC50: 271 mg/m3/1 hour

Flammability hazard characteristics

Contacting water to produce Smoke.

Storage Characteristics

Treasury ventilation low-temperature drying, stored separately from oxidants

Extinguishing agent

Dry sand, Dry soil, ban on water

Occupational standards

TWA 1 mg/cubic meter, STEL 2 mg/cubic meter

Chemical Properties

White solid

Chemical Properties

Phosphorus pentoxide is a white crystalline solid.


It is used as a dehydrating agent, in organic synthesis, and in hydrocarbon analysis.


Drying and dehydrating agent. Condensing agent in organic synthesis.

General Description

A white amorphous powder. Corrosive to metals and tissue and moderately toxic.

Air & Water Reactions

Readily absorbs moisture from the air forming a syrup of meta-, pyro-, and orthophosphoric acids. Reacts violently with water releasing considerable heat [Oldbury Chemicals, p. 9].

Reactivity Profile

Phosphorus pentoxide reacts violently and exothermically with water. The heat can ignite surrounding or admixed combustible materials. Undergoes hazardous or violent reactions with metal hydroxides and oxides, formic acid, hydrogen fluoride and hydrofluoric acid, iodides, metals (in particular potassium and sodium), oxidizing agents (bromine pentafluoride, chlorine trifluoride, perchloric acid, oxygen difluoride, hydrogen peroxide), ammonia, and proparygl alcohol. [Bretherick, 5th ed., 1995, p. 1781; EPA, 1998]. A violent explosion occurs if a solution of perchloric acid in chloroform is poured over phosphorus pentaoxide [EPA, 1998].

Health Hazard

Powder and fumes in the air are irritating to eyes and the respiratory tract. Particles in contact with eye react vigorously and even a small amount may cause permanent burns. Contact with the skin will cause severe burns. Ingestion will damage the gastrointestinal tract. Corrosive to skin, mucous membranes and eyes.

Health Hazard

Because of its dehydrating action, phosphorus pentoxide is a highly corrosive substance. It is an irritant to the eyes, skin, and mucous membranes.
Inhalation of its vapors caused chronic pulmonary edema, injury to lungs, and hemorrhage in test animals. The LC50 values varied significantly with the species.
LC50 value, inhalation (rats): 127 mg/m3/h .

Fire Hazard

Reacts violently with water to evolve heat. Flammable poisonous gases may accumulate in tanks and hopper cars. Phosphorus pentoxide reacts violently with the following: ammonia, hydrofluoric acid, oxygen difluoride, potassium, sodium, propargyl alcohol, calcium oxide, sodium hydroxide and chlorine trifluoride. A violent explosion occurs if a solution of perchloric acid in chloroform is poured over phosphorus pentoxide. Avoid formic acid, hydrogen fluoride, inorganic bases, metals, oxidants, water. Readily absorbs moisture from air to form meta-, pryo-, or orthophosphoric acid.

Agricultural Uses

Phosphoric anhydride is another name for phosphorus pentoxide (P2O5). Anhydrides react with water to give acids. For example, sulphur trioxide reacts with water to give sulphuric acid, or acetic anhydride reacts with water to give acetic acid. Similarly, phosphorus pentoxide has great affinity for water and dissolves in it to give phosphoric acid, and therefore, is known as phosphoric anhydride.

Agricultural Uses

Phosphorus pentoxide (P2O5) or phosphoric anhydride is a white, highly deliquescent solid which sublimes at 300°C and reacts violently with water to give orthophosphoric acid. It is prepared by burning elemental phosphorus in excess oxygen, and then purified by sublimation. The compound is used as a drying and dehydrating agent; for example, the amides are converted into nitriles, and sulphuric acid is converted to sulphur trioxide (SO3). The fertilizer phosphorus is specified as the weight percentage of phosphorus pentoxide.

Safety Profile

Poison by inhalation. A corrosive irritant to the eyes, shin, and mucous membranes. With the appropriate conditions it undergoes hazardous reactions with formic acid, hydrogen fluoride, inorganic bases, iodides, metals, methyl hydroperoxide, oxidants (e.g., bromine, pentafluoride, chlorine trifluoride, perchloric acid, oxygen Difluoride, hydrogen peroxide), 3-propynol, water. When heated to decomposition it emits toxic fumes of POx.

Potential Exposure

This material is used as an intermediate in organic synthesis, catalyst, condensing agent; dehydrating agent; in the preparation of acrylate esters, surfactants, sugar refining; medicine, fire extinguishing; and special glasses.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious, administer water, or milk. Do not induce vomiting. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures. Rush to a health care facility


UN1807 Phosphorus pentoxide, Hazard class: 8; Labels: 8-Corrosive material.

Purification Methods

It has been sublimed at 250o under vacuum into glass ampoules. It fumes in moist air and reacts violently with water. It is an excellent drying agent for use in desiccators. HARMFUL VAPOURS and attacks skin. [Manley J Chem Soc 121 331 1922, Klements in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 541 1963.]


Reacts violently and exothermically with water, forming ignition level heat and highly corrosive phosphoric acid. Keep away from the combination of moisture and combustible materials. Phosphorus pentoxide reacts violently with the following: perchloric acid; ammonia, hydrofluoric acid; oxidizers, hydrogen fluoride; formic acid, oxygen difluoride, potassium, sodium, propargyl alcohol; calcium oxide; inorganic bases; sodium hydroxide and chlorine trifluoride. Attacks many metals in presence of water. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, alcohols, ammonia. Undergoes hazardous or violent reactions with metal hydroxides and oxides, formic acid, hydrogen fluoride and hydrofluoric acid, iodides, metals (in particular potassium and sodium), ammonia, and proparygl alcohol.

Waste Disposal

Decompose with water, forming phosphoric and hydrochloric acids. The acids may then be neutralized and diluted slowly to solution of soda ash and slaked lime with stirring then flush to sewer with large volumes of water.

Phosphorus pentoxide Preparation Products And Raw materials

Raw materials

Preparation Products

Phosphorus pentoxide Suppliers

Global( 256)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Chemson Industrial (Shanghai) Co., Ltd.
86-21-65180813 CHINA 121 58
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22043 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20786 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32651 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1662 55
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24118 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20243 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 4525 58
career henan chemical co
+86-371-86658258 CHINA 19997 58
ALB Technology Limited 702-983-3769
702-983-3769 United States 2998 55

View Lastest Price from Phosphorus pentoxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-19 Phosphorus pentoxide
US $1.00 / kg 1kg 98% 500kg career henan chemical co
2018-04-24 phosphorus pentoxide
US $1.90 / KG 180KG 98% 1000tons Chemson Industrial (Shanghai) Co., Ltd.

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