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Sulfur and phosphorus compounds

Dimethyl phosphate

Also known as Dimethyl hydrogen phosphate, Dimethylphosphate, O,O-Dimethyl phosphate

CAS 813-78-5Formula C2H7O4PMolar mass 126.05 g/molEC 212-389-6
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 12 suppliers listed
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Dimethyl phosphate chemical structure, C2H7O4P, CAS 813-78-5
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Boiling point
172.2 to 176.1
Density
1.335 at 77 °F - Denser than water, will sink
Flash point
>93.3
Solubility
Greater than or equal to 100 mg/mL at 70 °F
HS code
291990
Category
Sulfur and phosphorus compounds
UN number
UN 3265
Illustrative photo, 200 litre blue HDPE drums of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Dimethyl phosphate?

Plain description, key identifiers and synonyms

Dimethylphosphate is a dialkyl phosphate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dimethyl hydrogen phosphate
CAS number
813-78-5 CAS number cross-checkedOther or deprecated CAS: 53396-59-1
EC number
212-389-6
Molecular formula
C2H7O4P
UNII
HI4K2C9UEI
MDL number
MFCD00014887
InChIKey
KKUKTXOBAWVSHC-UHFFFAOYSA-N
InChI
InChI=1S/C2H7O4P/c1-5-7(3,4)6-2/h1-2H3,(H,3,4)
SMILES (canonical and isomeric)
COP(=O)(O)OC

Synonyms

  • Dimethyl hydrogen phosphate
  • Dimethylphosphate
  • O,O-Dimethyl phosphate
  • Phosphoric acid, dimethyl ester
  • O,O-Dimethyl hydrogen phosphate
  • dimethoxyphosphinic acid
  • Methyl phosphate ((MeO)2(HO)PO)
  • Dimethylhydrogenphosphate
  • dimethyl phosphate, AldrichCPR
  • Phosphoric acid dimethyl ester
  • Dimethylphosphate, Phosphoric acid, dimethyl ester,
  • dimethyl phosphoric acid
  • 4-01-00-01259 (Beilstein Handbook Reference)
  • Dimethyl Phosphate (Olaparib Impurity)
  • Dimethyl phosphate, Phosphoric acid dimethyl ester
  • KFG

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

Physical form
Liquidexp.
Boiling point
172.2 to 176.1exp.
Density
1.335 at 77 °F - Denser than water, will sinkexp.
Flash point
>93.3exp.
Solubility
Greater than or equal to 100 mg/mL at 70 °Fexp.

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
126.05 g/molcalc.
Exact mass
126.0082 Dacalc.
LogP (octanol/water)
0.38calc.
Topological polar surface area
55.76 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302 + H312Harmful if swallowed. Harmful in contact with skin.
  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H314Causes severe skin burns and eye damage.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
Precautionary statements (22)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3265

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

Dimethyl phosphate suppliers

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

All 12 suppliers
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Where suppliers are based

12 suppliers in 3 countries

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Dimethyl phosphate 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

Industrial uses: Surfactant (surface active agent).

Consumer uses: Surfactant (surface active agent).

Use classes: Pesticide transformation products.

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Dimethyl phosphate is traded under.

HS 2919.90Indicative HS code

Phosphoric, and their salts, including lactophosphates, their halogenated, sulphonated, nitrated…

World exports in 2024
$940M
−0.7% vs 2023, imports $863M
2019 to 2024
Top exporters
  1. China55.6%
  2. Germany10.6%
  3. Italy6.2%
Top importers
  1. United States15.8%
  2. South Korea10.1%
  3. Germany6.4%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Dimethyl phosphate, based on the data on this page

What is Dimethyl phosphate?

Dimethylphosphate is a dialkyl phosphate.

What is the CAS number of Dimethyl phosphate?

The CAS registry number of Dimethyl phosphate is 813-78-5. Other or deprecated CAS numbers: 53396-59-1.

What is the molecular formula and weight of Dimethyl phosphate?

The molecular formula of Dimethyl phosphate is C2H7O4P and its molar mass is 126.05 g/mol.

What is Dimethyl phosphate used for?

Industrial uses: Surfactant (surface active agent). Consumer uses: Surfactant (surface active agent). Use classes: Pesticide transformation products.

Is Dimethyl phosphate hazardous?

Dimethyl phosphate carries the GHS signal word "Danger". Main hazards: harmful if swallowed. harmful in contact with skin, harmful if swallowed, harmful in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dimethyl phosphate?

Dimethyl phosphate is usually classified under HS code 291990 (Phosphoric esters and their salts, including lactophosphates, their halogenated…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Dimethyl phosphate?

CompoundList lists 12 suppliers of Dimethyl phosphate in United States, China and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Dimethyl phosphate?

Suppliers quote Dimethyl phosphate 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 Dimethyl phosphate

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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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