Tertiary butyl mercaptan, also known as tert-butyl mercaptan, TBM, or t-butyl mercaptan, is an organosulfur compound with the chemical formula C4H10S widely recognized for its extremely strong odor. This clear to light yellow liquid is commonly used as an odorant in natural gas and liquefied petroleum gas systems so leaks can be detected at very low concentrations. TBM is also used as a chemical intermediate in specialty sulfur compound production and in certain rubber processing applications. When evaluating compatibility, O-rings, rubber seals, gaskets, and plastic components should be carefully selected because sulfur compounds can affect some rubber materials. Proper handling, storage away from ignition sources, ventilation, and protective equipment are essential for safe industrial use.

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