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Standards Development
1.This document specifies a methods using High Performance Thin Layer Chromatography (HPTLC) for the separation, identification and quantification 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 2morpholinothio- 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 C shall be used.
This proposal introduces an automated High Performance Thin Layer Chromatography (HPTLC) system with fully quantitative detection capability. The system offers high analytical resolution and a reliable limit of detection (LOD), reducing the risk of false or inaccurate test results. Compared with conventional manual TLC, the automated approach significantly minimizes human handling and exposure to solvents and silica, thereby improving laboratory safety and occupational health. Importantly, the proposed work is aligned with EU Regulation 2017/745, which requires manufacturers to identify and declare substances that may cause allergic reactions, and supports compliance with the recently published EN 455-5 standard that emphasizes quantitative analytical determination. The system can be configured as either fully automated or semi-automated to meet specific customer and operational needs.
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