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Trimethyl borate

Trimethyl borate
Trimethyl borate structure
Chemical Name:
Trimethyl borate
C3H9BO3;B(OCH3)3;trimethyl;borestero;Borester O;METHYL BORATE;TriMethyl borat;Trimethoxyboron;Trimthyl borate;BORON METHOXIDE
Molecular Formula:
Formula Weight:
MOL File:

Trimethyl borate Properties

Melting point:
-34 °C
Boiling point:
68-69 °C(lit.)
0.932 g/mL at 20 °C(lit.)
vapor density 
3.59 (vs air)
refractive index 
n20/D 1.358(lit.)
Flash point:
8 °F
storage temp. 
Flammables area
Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol.
Water Solubility 
Moisture Sensitive
Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable.
CAS DataBase Reference
121-43-7(CAS DataBase Reference)
NIST Chemistry Reference
Boric acid, trimethyl ester(121-43-7)
EPA Substance Registry System
Boric acid (H3BO3), trimethyl ester(121-43-7)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H225-H312-H319-H360FD-H370-H335-H336-H360-H372-H226-H300-H330
Precautionary statements  P301+P310a-P304+P340-P320-P330-P501a-P201-P210-P260-P302+P352+P312-P308+P311-P337+P313-P202-P233-P240-P241+P242+P243-P264-P270-P271-P280-P303+P361+P353-P304+P340+P312-P305+P351+P338+P337+P313-P307+P311-P370+P378-P403+P233-P405-P501-P261-P302+P352+P312+P362+P364-P241
Hazard Codes  Xn,F,T
Risk Statements  11-21-23/25-36/37/38-10-36-61-60
Safety Statements  16-27-36/37/39-45-25-23-2-26-53
RIDADR  UN 2416 3/PG 2
WGK Germany  3
RTECS  ED5600000
HazardClass  3
PackingGroup  II
HS Code  29209085
Toxicity LD50 orally in rats: 6.14 ml/kg (Smyth)

NFPA 704

Diamond Hazard Value Description
Flammability   3 Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions . Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). (e.g. gasoline, acetone)
Instability   1 Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene)

(NFPA, 2010)

Trimethyl borate price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 443999 Trimethyl borate purified by redistillation, ≥99.5% 121-43-7 100ml $58.1 2018-11-13 Buy
Sigma-Aldrich 443999 Trimethyl borate purified by redistillation, ≥99.5% 121-43-7 1l $286 2018-11-13 Buy
TCI Chemical B0226 Trimethyl Borate (63-65% in Methanol) 121-43-7 25mL $16 2018-11-22 Buy
TCI Chemical B0226 Trimethyl Borate (63-65% in Methanol) 121-43-7 500mL $35 2018-11-22 Buy
Alfa Aesar B20215 Trimethyl borate, 99% 121-43-7 250ml $23.3 2018-11-13 Buy

Trimethyl borate Chemical Properties,Uses,Production

Chemical Properties

Water-white liquid. Miscible with ether, methanol, hexane, tetrahydrofuran; decomposes in presence of water.


As solvent for waxes, resins, oils; catalyst in the manufacture of ketones; analysis of paint and varnish ingredients; as neutron detector gas in the presence of a scintillation counter; as a promoter of diborane reactions.


ChEBI: A member of the class of borate esters obtained by the formal condensation of three equivalents of methanol with boric acid.

General Description

A water-white liquid. Denser than water. Flash point 80°F. Vapors heavier than air. Used as a solvent and fungicide for fruit.

Air & Water Reactions

Highly flammable. Rapidly decomposes in water.

Reactivity Profile

Borates, such as Trimethyl borate, behave similarly to esters in that they react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction of esters with caustic solutions. Flammable hydrogen is generated by mixing esters/borates with alkali metals and hydrides.

Health Hazard

May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Safety Profile

Moderately toxic by ingestion, skin contact, and intraperitoneal routes. An eye irritant. A very dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderately explosive when exposed to flame. Will react with water or steam to produce toxic and flammable vapors. To fight fire, use dry chemical, CO2, spray, foam. When heated to decomposition it emits acrid smoke and irritating fumes. See also ESTERS and BORON COMPOUNDS.

Purification Methods

Carefully fractionate the borate through a gauze-packed column. Re-distil and collect it in weighed glass vials and seal them. Keep it away from moisture. It undergoes alkyl exchange with alcohols and forms azeotropes, e.g. with MeOH the azeotrope consists of 70% (MeO)3B and 30% MeOH with b 52-54o/760mm, d 0.87. [Charnley et al. J Chem Soc 2288 1952, Gerrard & Lappert Chem Ind (London) 53 1952, Schlesinger et al. J Am Chem Soc 75 213 1953.] It has also been dried with Na and then distilled. [Beilstein 1 IV 1269.]

Trimethyl borate Preparation Products And Raw materials

Raw materials

Preparation Products

Trimethyl borate Suppliers

Global( 252)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21676 58
Shanghai Bojing Chemical Co.,Ltd.
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Henan Tianfu Chemical Co.,Ltd.
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+86-021-57951555 CHINA 1365 55
Mainchem Co., Ltd.
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86-0551-65418684 18949823763
86-0551-65418684 China 1861 55
Hebei Chisure Biotechnology Co., Ltd.
0311 66567340 CHINA 1017 58
career henan chemical co
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+86 18953170293
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View Lastest Price from Trimethyl borate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-05 Trimethyl borate
US $10.00 / KG 1KG 99% 10 mt Hebei Guanlang Biotechnology Co., Ltd.
2018-12-17 Trimethyl borate
US $8.00 / kg 1kg 99% 10MT career henan chemical co
2018-12-17 Trimethyl borate
US $1.00 / kg 1kg 99% 200kg career henan chemical co

Trimethyl borate Spectrum

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