EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of EN ISO 24538 testing. EN ISO 24538 specifies a method for the determination of residual vinyl chloride monomer in homopolymer and copolymer resins of vinyl chloride. The method is based on a static headspace gas chromatography technique (ie analysis of solid phase and vapor phase in equilibrium at constant temperature) and is suitable for all types of homopolymer and copolymer resins. It is made in powder form directly on the resin.
The weighed sample amount is sealed in a glass bottle. After a certain period of thermal conditioning to allow the vinyl chloride monomer (VCM) to equilibrate between the powder and vapor phase, a gas sample is taken from the headspace. The components are separated on a column and detected using a flame ionization detector.
During storage, a concentration gradient may have formed in the sampled PVC as the upper layers now release VCM more rapidly. It is recommended to cool the sample, but condensation of moisture should be avoided. Perform sample preparation as quickly as possible to minimize residual monomer losses. When changing samples between labs or when storage is required, cap samples in fully filled glass bottles.
Before collecting the test sample, it is recommended to clean the vial in which the test sample will be placed with nitrogen to remove possible traces of VCM. Weigh 2 g to 4 g of the PVC resin to be analyzed (the same amount used for calibration) to an accuracy of 0,001 g into a clean 22 ml bottle and immediately close the vial with a septum and an aluminum cap. Place in the headspace sampler of the gas chromatograph for 120 min at 15 °C to allow temperature equilibration and then start the analysis run. Perform two determinations on each sample.
Determination is based on external standard calibration using at least two calibrant concentrations. From each calibration run, the detector response factor is determined. The average response factor is then used to calculate the VCM content of the sample from the sample analysis run.
EUROLAB assists manufacturers with EN ISO 24538 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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