BS ISO 4661-2:2018 pdf download – Rubber, vulcanized — Preparation of samples and test pieces Part 2: Chemical tests 1 Scope This document specifies a method of preparing samples from vulcanized rubber for use in chemical tests. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1407:2011, Rubber — Determination of solvent extract 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Preparation of samples 4.1 Soft vulcanized rubber The sample shall be comminuted with scissors, a rotating rasp, a suitable grinder or by cryogenic crushing to pass a sieve with an approximately 1,7 mm opening. Alternatively, it shall be sheeted to a thickness not exceeding 0,5 mm by passing between cold, tightly closed rolls of a laboratory mill. The type of grinder or mill used is immaterial, provided that the sample does not become contaminated or unduly heated. 4.2 Ebonite The sample shall be rasped to powder which will pass a sieve with an approximately 400 μm opening. The powder shall be treated with a magnet to remove any iron particles. 4.3 Rubberized composites Where it is not possible to separate the rubber mechanically, the following procedure shall be carried out. The rubber shall be separated by exposing it to the vapour only of a suitable solvent. For composites based on NR, SBR and BR, acetone or ETA (ethanol‑toluene azeotrope) will be suitable solvents. For other types of rubber, refer to ISO 1407:2011 (Annex A) for suitable solvents. The time of exposure should be kept as short as possible to avoid any possibility of extracting plasticizers from the rubber compound. Afterwards, the swollen rubber shall have the solvent completely removed in air at room temperature and treated as described in 4.1. In cases where the rubber is chemically bonded to the substrate, it should be noted that the composition of the rubber in the region of the bond can be substantially different from that in the bulk of the material. In all cases, sampling...
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