BS ISO 04650:2012 pdf download

BS ISO 04650:2012 pdf download.Rubber — ldentification —Infrared spectrometric methods.
4 Types of rubber
4.1 General
Roth methods are applicable to rubbers In the raw state and. Ifuompounded, in both the vulcanized and unvulcanized states. They are applicable to the following types or 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 Mgroup
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 chlorosulfonylpolyethytene (CSM): The methods will not dIfferentiate CM Irvin 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 0 group
4.1.2.1 Polychloromethyloxirane (CO): Copolymer of ethylene oxide and chioromethyloxirane (ECO) and terpolymers (GECO). Examination of the pyrolysate will not differentiate between different types of CO.
4.1.3 Q group
4.1.3.1 Polydimethylsiloxane (MQ), polymethylphenylsiloxane (PMQ) and polymethylfluorosiloxane (FMQ): Examination of the pyrolysate will differentiate PMQ from MQ.
4.1.4 R group
4.1.4.1 Hutadienerubber(HR): Examination oithe pyrolysate will notdifferenuate between butadiene rubbers having different isomer ratios. However, examination of a raw rubber film gives some information about the isomer ratio.
4.1.4.2 Chloroprene rubber (CR): The methods will not differentiate between the different types of CR.
4.1.4.3 Isobutene-Isoprene rubber (llR) and halogenated isobutene-isoprene rubbers (Bilk and CuR) and brominated isobutylene-co-p-methylstyrene (BIMS): Under the conditions used, it is not possible to differentiate between hR. RIIR. CIIR and polyisohutcne.
4.1.4.4 Natural rubber (NR) and synthetic isoprene rubber (IR): Natural rubber (l,4-cis- polyisoprene), gutta percha, balata [1,4-trans-polyisoprene) and synthetic isoprene rubber, whatever their microstructure (1,4-cis. 1,4-trans or 3,4-), are included.
9.1.2 Reference spectra shall be produced from test samples of known composition, following the procedure used for unknown samples.
9.1.3 Spectra of mixtures are not given in Annex B because of the multiplicity of polymer combinations and proportions. Each laboratory should prepare Its own set from test samples of known composition.
9.1.4 Small, but unavoidable, variations in experimental conditions and instrument characteristics may give rise to slight differences in spectra. Spectra produced at different times may not be identical in terms of peak height and absorbance.
9.1.5 In all cases, spectra shall be interpreted bearing in mind the result of the test for halogen.
9.1.6 The comparison between test spectra and reference spectra shall take into account the wavenumbers of the bands, how many hands are present, their relative intensity and their form. Any unexpected bands shall also be Interpreted. It is essential that all the bands be examined. Irrespective of their number.
9.2 Tables of diagnostic absorptlons
9.2.1 The tables of diagnostic absorption bands given in Annex B shall be used only in conjunction with reference spectra. Their purpose is to indicate the principal absorption bands.
9.2.2 The tables complement the reference spectra by drawing attention to absorption bands which are absent, permitting the elimination of certain rubbers when ambiguity could otherwise arise.
9.2.3 Diagnostic absorption bands are classified by increasing wavenumber. A diagnostic absorption band is one whose features are recognized by an experienced analyst as being of significance in rubber identification. These features, associated with certain compositional or structural characteristics of the pyrolysates and films, are reproducible in the sense that they are not seriously influenced by moderate variations in the conditions of pyrolysis or of dissolution.
10 Test report
The test report shall include the following particulars:
a) sample details:
1) a full description of the sample,
2) if appropriate, the method of preparation of the test sample from the sample; b) test method:
1) a reference to this International Standard, i.e. ISO 4650,
2) the test procedure used (film or ATR);
c) details of any procedures not specified In this International Standard:
d) the test results, i.e. identification of the rubber(s) in the sample;
e) the date of the test.