4-Morpholinecarbodithioic acid, 4-morpholinyl ester

4-Morpholinecarbodithioic acid, 4-morpholinyl ester (CAS 13752-51-7) is a dithiocarbamate-based rubber accelerator commercially known as OTOS or Cure-Rite 18. It carries EC number 237-335-9 and the molecular formula C9H16N2O2S2. No E-code designation applies to this substance.

In rubber vulcanization, OTOS functions as a secondary accelerator that activates sulfur cross-linking networks, reducing cure time and improving crosslink density in natural and synthetic rubber compounds. It is used in tire manufacturing and technical rubber goods where controlled scorch safety and consistent cure plateau are required alongside a primary thiazole or sulfenamide accelerator.

This compound is subject to REACH registration requirements for EU supply. It is available for procurement in standard industrial packaging, with grade selection dependent on application and processing conditions. Buyers should confirm supplier documentation for SDS compliance and substance identity under REACH before placing orders.