BS ISO 17257:2013 pdf free

BS ISO 17257:2013 pdf free.Rubber – ldentification of polymers
BS ISO 17257 provides a qualitative method for the identification of rubbers by their pyrolysis products using tandem the gas-chromatography /mass spectrometry.
The method applies to rubbers in the raw state and to unvulcanized and vulcanized compounds.Compounds can be based on a single rubber or a blend of two or more rubbers. Where the level of a particular rubber in a blend is < 10 % detection and identification can be difficult.
A non-restrictive list of rubbers is given in Clause 3.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1407, Rubber一Determination of solvent extract
ISO 1629, Rubber and latices一Nomenclature
Non-volatile polymers are decomposed at elevated temperature to generate volatile products able to be analysed by chromatography. In order to obtain reproducible results of decomposition, the pyrolysis parameters (temperature, time) need to be established separately.
Different types of equipment are available that give a rapid and reproducible pyrolysis. The three most common are:
一platinum filament pyrolyser;
一Curie point pyrolyser;
一micro furnace pyrolyser.
There are several categories of chromatographic columns available in the market. They are characterized by:
一the nature of the material constituting the tube (generally silica covered with a polymer, aluminium or deactivated stainless steel, etc.);
一the column length;
一the column diameter;
一the nature, thickness, and polarity of the stationary phase placed on the internal surface of the capillary tube.
The column shall be chosen by taking into account its efficiency of separation (number of theoretical plates) and the relative polarity of the various compounds generated during rubber pyrolysis.
Adjust the various controls of the gas chromatograph according to the retained operating conditions. For information, typical operating conditions are given in Annex B.BS ISO 17257 pdf download.