Trimethyl Phosphate

Description

Trimethyl Phosphate · CAS 512-56-1 · C3H9O4P. UNII Z1E45TMW1Z. Boiling Point: 387 °F at 760 mmHg (NTP, 1992); Boiling Point: 197.2 °C; Boiling Point: 197.2 °C @760 [mm Hg].

Identification

CAS Registry Number	512-56-1
PubChem CID	10541
Molecular formula	C3H9O4P
IUPAC name	trimethyl phosphate
UNII (FDA)	Z1E45TMW1Z

Computed Descriptors

Molecular Weight	140.07
XLogP3	-0.5
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	3
Exact Mass	140.02384576
Monoisotopic Mass	140.02384576
Topological Polar Surface Area	44.8
Heavy Atom Count	8
Formal Charge	0

Physical & Chemical Properties

Boiling Point	387 °F at 760 mmHg (NTP, 1992)
Boiling Point	197.2 °C
Boiling Point	197.2 °C @760 [mm Hg]
Melting Point	-51 °F (NTP, 1992)
Melting Point	-46 °C
Flash Point	107 °C
Flash Point	150 °C (302 °F) (Closed cup)
Solubility	In water, 5.0X10+5 mg/L at 25 °C
Density	1.2144 g/cu cm at 20 °C
Density	1.97 @ 19.5°C

Physical description & handling notes

• Trimethyl phosphate appears as a pale straw colored liquid. Inhalation may irritate respiratory tract. Vapor or liquid may irritate skin or eyes. Ingestion may irritate the mucous membranes of the gastrointestinal tract.
• Liquid
• Clear liquid; [Hawley]
• COLOURLESS LIQUID.
• Colorless liquid
• Pleasant smelling

Regulatory Status

GHS notification summary	35.1% (121 / 345)

GHS Hazard Classification

GHS notification summary	35.1% (121 / 345)
Reported hazard statements	H302 (58.6%), H315 (60%), H319 (53.6%), H340 (53.9%), H351 (47.2%), H360, H320, H361

Documented Uses

• Used as a gasoline additive, methylating agent, flame-resistant solvent for paints and polymers, catalyst in polymers and resins, and to make polymethyl polyphosphates; [HSDB]
• Painting (Solvents) [Category: Paint]
• Plastic Composites Manufacturing [Category: Industry]
• For controlling spark plug fouling, surface ignition and rumble in gasoline engines.
• Gasoline additive at 0.25 g/gal for controlling surface ignition and spark plug fouling; methylating agent, chemical intermediate in the production of polymethyl polyphosphates; flame retardant solvent for paints and polymers; catalyst in the preparation of polymers and resins.
• Not Known or Reasonably Ascertainable

Synonyms

TRIMETHYL PHOSPHATE; 512-56-1; Trimethylphosphate; Trimethyl orthophosphate; Phosphoric acid, trimethyl ester; TMPO; Phosphoric acid trimethyl ester; Trimethoxyphosphine oxide; O,O,O-Trimethyl phosphate; Trimethylfosfat; NCI-C03781; DTXSID1021403; Z1E45TMW1Z; NSC-58985; DTXCID101403; CHEBI:46324

Frequently Asked Questions

What are the CAS number and molecular formula of Trimethyl Phosphate?

CAS 512-56-1; molecular formula C3H9O4P; molecular weight — g/mol.

What other names is Trimethyl Phosphate known by?

TRIMETHYL PHOSPHATE, 512-56-1, Trimethylphosphate, Trimethyl orthophosphate, Phosphoric acid, trimethyl ester, TMPO.

Is Trimethyl Phosphate classified as hazardous?

35.1% of GHS notifications report no hazard classification (121 of 345).

What are the key physical properties of Trimethyl Phosphate?

Boiling Point: 387 °F at 760 mmHg (NTP, 1992); Boiling Point: 197.2 °C; Boiling Point: 197.2 °C @760 [mm Hg]; Melting Point: -51 °F (NTP, 1992).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.