Trimethylborane (TMB) is a toxic, pyrophoric gas with the formula B(CH3)3 (which can also be written as Me3B, with Me representing methyl). Its melting point is -161.5°C and its boiling point is -20.2°C. Vapour pressure is given by log P = 6.1385+1.75 log T - 1393.3/T - 0.007735 T. T is temperature in Kelvin. CAS number is 593-90-8. Molecular weight is 55.914. The heat of vapourisation is 25.6 kJ/mol.

CAS：593-90-8
中文别名：
英文别名：Borane,trimethyl;Trimethylborate;trimethyl boron;Borane, trimethyl-;trimethylborine;trimethyl-borane;trimethyl boronate;
分子式：C3H9B
分子量：55.9146
精确质量：56.0797
Psa：0.0
Logp：1.3706

EINECS号：209-816-3

外观与性状：无色气体
密度：0.559 g/cm3
沸点：20ºC at 760 mmHg
熔点：-161.5ºC
折射率：1.311

危险类别码：R11
危险品运输编码：UN 3160
危险类别：2.3
危险品标志：F; C
危险性防范说明：P280; P305 + P351 + P338; P310; P410 + P403
危险性描述：H280; H314
信号词：Danger
危险标志：GHS04, GHS05