ISO 247-2-2018 pdf free.Rubber- Determination of ash – Part 2: Thermogravimetric analysis (TGA). 6.1 Thermogravlmetric analyser. comprising the following elements: a) Therino-balance; b) Heating furnace; c) Temperature programmer; d) Gas flow controller, for controlling the purge gas to the balance and furnace, and keeping a constant flow rate. 6.2 Sample pan. platinum pan or alumina ceramic pan. 6.3 Analytical balance, capable of weighing to the nearest 0,1 mg. 7 Preparation of the test sample 7.1 For raw natural rubber, test samples shall be cut from the homogenized piece prepared in accordance with ISO 1795. For raw synthetic rubber, test samples shall be cut from the dried rubber obtained after carrying out the determination of volatile-matter content in accordance with the hot-mill method of ISO 248-1. Take a test portion of about 2 g to 5 g from the homogenized sample and cut into pieces by hand. 7.2 Test samples of rubber compounds shall be sheeted on a mill and cut into pieces by hand. 7.3 Test samples of vulcanizates shall be sheeted or crumbed on a mill or comminuted by hand. 7.4 Care shall be taken to ensure that test samples of rubber compounds and vulcanizates are representative of the…