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Lubricants and lubricant additives

Methylphosphonic acid

Also known as Methanephosphonic acid, Phosphonic acid, methyl-, Methyl phosphonic acid

CAS 993-13-5Formula CH5O3PMolar mass 96.02 g/molEC 213-607-2
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant Controlled, licensed buyers only
Request as a licensed buyer Safety data
Methylphosphonic acid chemical structure, CH5O3P, CAS 993-13-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White solid
Melting point
108.5 °C
Boiling point
Decomposes
Solubility
In water, >20,000 mg/l (no temperature reported)
HS code
293144
Category
Lubricants and lubricant additives

What is Methylphosphonic acid?

Plain description, key identifiers and synonyms

Methylphosphonic acid is a one-carbon compound that is phosphonic acid in which the hydrogen attached to the phosphorus is substituted by a methyl group. It is a member of phosphonic acids and a one-carbon compound. It is functionally related to a phosphonic acid. It is a conjugate acid of a methylphosphonate(1-).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
methylphosphonic acid
CAS number
993-13-5 CAS number cross-checked
EC number
213-607-2
Molecular formula
CH5O3P
UNII
329W4YM10Z
MDL number
MFCD00002137
InChIKey
YACKEPLHDIMKIO-UHFFFAOYSA-N
InChI
InChI=1S/CH5O3P/c1-5(2,3)4/h1H3,(H2,2,3,4)
SMILES (canonical and isomeric)
CP(=O)(O)O

Synonyms

  • Methanephosphonic acid
  • Phosphonic acid, methyl-
  • Methyl phosphonic acid
  • p-methylphosphonic acid
  • Phosphonic acid, P-methyl-
  • Phosphonomethyl group
  • Methylphosphonicacid
  • VXA
  • Methylphosphonic acid, 98%
  • Dihydrogen methylphosphonate
  • Methylphosphonic acid, 99.0-101.0% (T)
  • Methylphosphonic acid Solution in Water, 100ug/mL

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
White solidexp.
Melting point
108.5 °Cexp.
Boiling point
Decomposesexp.
Solubility
In water, >20,000 mg/l (no temperature reported)exp.

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
96.02 g/molcalc.
Exact mass
95.9976 Dacalc.
LogP (octanol/water)
-0.21calc.
Topological polar surface area
57.53 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
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

  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
Precautionary statements (17)
  • P260Do not breathe 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.
  • 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 + 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.
  • P363Wash contaminated clothing before reuse.
  • 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

Methylphosphonic acid suppliers

Controlled substance, listings of documented suppliers only, in the documented ranking

Chemical Weapons Convention Schedule 2

Methylphosphonic acid is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: OPCW Chemical Weapons Convention Schedule 2, HS 2022 subheading 2931.44 (methylphosphonic acid)

Our policy on controlled substances
No documented supplier lists it yet

Licensed buyers can post a request for Methylphosphonic acid with their licence. Our compliance team reviews it before suppliers see it.

Request as a licensed buyer

Methylphosphonic acid 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

Organic synthesis.

Used in the production of lubricant additives and for treating textiles.

Chemical warfare simulant.

Industrial uses: Flame retardant.

Use classes: Pesticide transformation products.

Regulatory status

Inventories, regulations and trade controls that list this substance

Chemical Weapons Convention Schedule 2

Methylphosphonic acid is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: OPCW Chemical Weapons Convention Schedule 2, HS 2022 subheading 2931.44 (methylphosphonic acid)

Our policy on controlled substances

Controls

  • Chemical Weapons Convention Schedule 2

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Added by a premanufacture notice

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Methylphosphonic acid is traded under.

HS 2931.44Exact HS code

Non-halogenated organo-phosphorous derivatives: methylphosphonic acid

World exports in 2024
$1.86M
−12.8% vs 2023, imports $2.15M
2022 to 2024
Top exporters
  1. Germany38.6%
  2. United States30.7%
  3. Netherlands24.9%
Top importers
  1. Canada25.5%
  2. Chile20.5%
  3. Germany8.1%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Methylphosphonic acid is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Methylphosphonic acid, based on the data on this page

What is Methylphosphonic acid?

Methylphosphonic acid is a one-carbon compound that is phosphonic acid in which the hydrogen attached to the phosphorus is substituted by a methyl group. It is a member of phosphonic acids and a one-carbon compound. It is functionally related to a phosphonic acid. It is a conjugate acid of a methylphosphonate(1-).

What is the CAS number of Methylphosphonic acid?

The CAS registry number of Methylphosphonic acid is 993-13-5.

What is the molecular formula and weight of Methylphosphonic acid?

The molecular formula of Methylphosphonic acid is CH5O3P and its molar mass is 96.02 g/mol.

What is Methylphosphonic acid used for?

Organic synthesis. Used in the production of lubricant additives and for treating textiles. Chemical warfare simulant. Industrial uses: Flame retardant. Use classes: Pesticide transformation products.

Is Methylphosphonic acid hazardous?

Methylphosphonic acid carries the GHS signal word "Danger". Main hazards: harmful if swallowed, causes severe skin burns and eye damage, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Methylphosphonic acid?

Methylphosphonic acid is usually classified under HS code 293144 (Methylphosphonic acid). This is indicative, confirm it with your customs broker before shipping.

Can I buy Methylphosphonic acid on CompoundList?

Methylphosphonic acid is a controlled substance. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed by our compliance team before suppliers see it.

Guides for buyers

Practical guides that help when you source, ship or handle Methylphosphonic acid

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Upload your licence with the request. Our compliance team reviews it before the documented suppliers see it.
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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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