ISO 4650:2012 pdf download – Rubber — Identification — Infrared spectrometric methods.
1  Scope This International Standard specifies two methods for the identification of rubbers, including thermoplastic elastomers, either in the raw state or in the form of vulcanized or unvulcanized mixes. The first method is based on infrared spectrometric examination using the transmission technique. The second method makes use of analysis by reflectance. A comparison of the spectra resulting from reflectance (attenuated total reflectance ATR) and transmission (film) is given in Annex A. Both methods comprise examination of polymers by their pyrolysis products (pyrolysates), or by films cast from solution or obtained by moulding (for raw rubbers only). Typical spectra are given in Annex B. The principle of the methods implies that sample preparation and analysis of the infrared spectra are carried out by experienced personnel and that the equipment used for the production of spectra is operated in accordance with the manufacturer’s instructions for optimum performance. Details of the operation of infrared spectrometers are not included in this International Standard. The methods specified are qualitative methods only. 2  Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1407, Rubber — Determination of solvent extract ISO 18064, Thermoplastic elastomers — Nomenclature and abbreviated terms
4  Types of rubber 4.1  General Both methods are applicable to rubbers in the raw state and, if compounded, in both the vulcanized and unvulcanized states. They are applicable to the following types of rubber occurring either alone or in a binary mixture when the proportion of the minor component is, in general, between 10 % to 20 % by mass of the mixture (see, however, exceptions in 4.2). 4.1.1  M group 4.1.1.1  Acrylic rubber (ACM): Copolymer of ethyl acrylate (or other acrylates) and a small amount of a monomer which facilitates vulcanization. 4.1.1.2  Copolymer of ethyl acrylate (or other acrylates) and ethylene (AEM). 4.1.1.3  Chloropolyethylene (CM) and chlorosulfonylpolyethylene (CSM): The methods will not differentiate CM from CSM, and it will not differentiate between different types of CSM. 4.1.1.4  Ethylene-propylene  copolymer  (EPM)  and  ethylene-propylene-diene  terpolymer (EPDM): The methods will not differentiate between the two types of polymer. However, examination of the spectrum gives some information about the ethylene-to-propylene ratio. 4.1.1.5  Fluorocarbon rubber (FKM): Examination of the pyrolysate may give some information about the different grades of fluorocarbon rubber present. 4.1.2  O group 4.1.2.1 Polychloromethyloxirane (CO): Copolymer of ethylene oxide and chloromethyloxirane (ECO) and terpolymers (GECO). Examination of the pyrolysate will not differentiate between different types of CO.