ISO 10398:1998
Rubber - Identification of accelerators in cured and uncured compounds

Standard No.

ISO 10398:1998

Release Date

1998

Published By

International Organization for Standardization (ISO)

Latest

ISO 10398:1998

Scope

1 This International Standard specifies methods using gas chromatography (GC) and thin layer chromatography (TLC) for the separation and identification of the following classes of accelerators in vulcanized and unvulcanized compounds: — thiazoles — sulfenamides — thiurams and dithiocarbamates — guanidines — dithiodimorpholine 2 When 2-mercaptobenzothiazole (MBT) is identified and no sulfenamides are present, it is not possible to establish if the original accelerator was MBT and/or its salts or 2,2'-dibenzothiazoledisulfide (MBTS) as each of these accelerators may be produced from the others during the vulcanization process. 3 When sulfenamides are identified, it is not possible to establish if MBT and/or its salts and MBTS are present as these accelerators may be produced from 2-mercaptobenzothiazole sulfenamides during the vulcanization process. 4 The methods do not distinguish thiurams and dithiocarbamates derived from the same amines. 5 From the morpholine identification it is not possible to determine if the initial accelerator is 2-morpholinothio-benzothiazole (MBS) or dithiomorpholine as morpholine may be formed from MBS and dithiodimorpholine during the vulcanization process. 6 The separation of accelerator compounds from unvulcanized compounds is relatively straightforward whereas separation from vulcanized compounds is difficult due to the lesser ability of solvents to penetrate the vulcanized matrix. 7 Some compounding ingredients may interfere with method B. In such cases methods A or C shall be used.

ISO 10398:1998 history

• 1998 ISO 10398:1998 Rubber - Identification of accelerators in cured and uncured compounds