1-Octanethiol

1-Octanethiol (CAS 111-88-6) is a straight-chain aliphatic thiol also known as n-Octylthiol, Octylthiol, and Mercaptan C8, marketed under the trade name NOM. It carries no assigned E-code and is classified under HS code 29309070 for customs purposes.

In polymer manufacturing, 1-Octanethiol acts as a chain-transfer agent during free-radical polymerization, regulating molecular weight by terminating and restarting growing polymer chains. In lubricant formulations, the thiol group bonds to metal surfaces, forming a protective boundary layer that reduces friction and wear under high-load conditions.

1-Octanethiol is supplied as a colourless liquid and is subject to REACH registration requirements within the European Economic Area. It is available for procurement in standard industrial packaging grades suited to plastics, lubricant, and pharmaceutical manufacturing applications. Buyers should confirm purity specifications and SDS documentation prior to order.