ASTM D 5051 - 06 (Reapproved 2012) Standard Test Method for Rubber Compounding Materials - Benzothiazyl Disulfide (MBTS)-Assay

Current edition approved May 1, 2012. Published July 2012. Originally approved in 1990. Last previous edition approved in 2006 as D5051 – 06. — 3 p.
This test method covers the determination of assay of benzothiazyl disulfide (MBTS). It is based on a titration of free iodine liberated upon reduction of MBTS, with potassium iodide (KI) in acid medium.
The assay is determined as mass percent.
Free 2-mercaptobenzothiazole (MBT) content is not determined.