Trimethyl borate

99.999% (trace metal basis)

Boric acid trimethyl ester, Methyl borate
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level

vapor density

3.59 (vs air)


99.999% (trace metal basis)

refractive index

n20/D 1.346 (lit.)


68-69 °C (lit.)


−34 °C (lit.)


0.932 g/mL at 20 °C (lit.)

SMILES string




InChI key


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4×25, 100 mL in Sure/Seal™
The 25 mL Sure/Seal bottle is recommended as a single-use bottle. Repeated punctures will likely result in decreased performance of product.

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Signal Word


Target Organs


Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 2416 3 / PGII

WGK Germany


Flash Point(F)

12.2 °F - (own results)

Flash Point(C)

-11 °C - (own results)

R Meder et al.
Solid state nuclear magnetic resonance, 15(1), 69-72 (2000-07-21)
Boron-11 nuclear magnetic resonance imaging and spectroscopy have been used to characterise the nature and distribution of boron compounds after preservative treatment of radiata pine wood with trimethylborate (TMB). One day after treatment, 11B magnetic resonance imaging microscopy showed significant...
Jayalakshmi Somuramasami et al.
Journal of the American Society for Mass Spectrometry, 22(6), 1040-1051 (2011-09-29)
Several lignin model compounds were examined to test whether gas-phase ion-molecule reactions of trimethylborate (TMB) in a FTICR can be used to differentiate the ortho-, meta-, and para-isomers of protonated aromatic compounds, such as those formed during degradation of lignin....
Scott Gronert et al.
Journal of the American Society for Mass Spectrometry, 13(9), 1088-1098 (2002-09-27)
Using a quadrupole ion trap mass spectrometer, trimethyl borate was allowed to react with dihydrogen phosphate, deprotonated O-phosphoserine, and a set of hydrogen bonded complexes involving dihydrogen phosphate and neutral acids (phosphoric acid, acetic acid, serine, and O-phosphoserine). The reactions...
Ryan J Eismin et al.
Journal of the American Society for Mass Spectrometry, 23(1), 12-22 (2011-10-18)
A mass spectrometric method has been delineated for the identification of the epoxide functionalities in unknown monofunctional analytes. This method utilizes gas-phase ion/molecule reactions of protonated analytes with neutral trimethyl borate (TMB) followed by collision-activated dissociation (CAD) in an ion...
Steven C Habicht et al.
Analytical chemistry, 80(9), 3416-3421 (2008-03-28)
A mass spectrometric method has been developed for the identification of the carboxylic acid functional group in analytes evaporated and ionized by electrospray ionization (ESI). This method is based on gas-phase ion-molecule reactions of ammoniated ([M + NH4]+) and sodiated...

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