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Trimethyl borate CAS#121-43-7

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Chemical Name：Trimethyl borate

CAS No.:121-43-7

Molecular Formula：C3H9BO3

Molecular weight:103.91

Sample: Available

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Product Details

Products Description of Trimethyl borate CAS#121-43-7

Moisture-sensitive liquid, fuming in the air. Melting point -29.3℃, boiling point 68-69℃, forms azeotropic mixture with methanol, azeotropic point 55℃, relative density (20/4) 0.920, refractive index (nD25) 1.3543 (1.3548). Very flammable, flash point -1℃. Miscible with ether, methanol, tetrahydrofuran, isopropylamine and hexane. Stable in anhydrous state, decomposes into methanol and boric acid in water.

Trimethyl borate Chemical Properties

Melting point	-34 °C (lit.)
Boiling point	68-69 °C (lit.)
density	0.932 g/mL at 20 °C (lit.)
vapor density	3.59 (vs air)
refractive index	n20/D 1.358(lit.)
Fp	8 °F
storage temp.	Store at <= 20°C.
solubility	Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol.
form	Liquid
Specific Gravity	0.915
color	Colorless
Water Solubility	reacts
Sensitive	Moisture Sensitive
Hydrolytic Sensitivity	7: reacts slowly with moisture/water
Merck	14,9712
BRN	1697939
Dielectric constant	8.2（20℃）
Exposure limits	ACGIH: TWA 200 ppm; STEL 250 ppm (Skin) OSHA: TWA 200 ppm(260 mg/m3) NIOSH: IDLH 6000 ppm; TWA 200 ppm(260 mg/m3); STEL 250 ppm(325 mg/m3)
Stability:	Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable.
InChIKey	WRECIMRULFAWHA-UHFFFAOYSA-N
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)

Safety Information

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
F	21
TSCA	Yes
HazardClass	3
PackingGroup	II
HS Code	29209085
Hazardous Substances Data	121-43-7(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 6.14 ml/kg (Smyth)

Product Application of Trimethyl borate CAS#121-43-7

Intermediate of potassium (sodium) borohydride. Vulcanizing agent, wood preservative, catalyst, gelling agent, heat stabilizer, hydrogen flame extinguishing agent, also used for flame retardant treatment of cotton and preparation of active silica, and as a reagent for gas chromatography analysis of carbohydrate derivatives.

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