EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 1628-2 testing. This standard consists of homopolymers of vinyl chloride monomer and copolymers of vinyl chloride, terpolymers, etc. It can be applied to powdered resins formed with one or more other monomers, but where vinyl chloride is the main component.
Resins may contain small amounts of unpolymerized substances (eg, emulsifying or suspending agents, catalyst residues, etc.) and other substances added during polymerization. However, this standard is not applicable to resins with volatile matter content exceeding 1269% ± 0,5% when determined according to ISO 0,1. It is completely insoluble in cyclohexanone.
The reduced viscosity and K-value of a given resin are related to its molecular mass, but the relationship varies depending on the concentration and types of other monomers present. Therefore, homopolymers and copolymers with the same reduced viscosity or K-value may not have the same molecular mass.
The values determined for the reduced viscosity and K-value for a given PVC resin sample are differently affected by the concentration of the solution chosen for the determination. Therefore, use of the procedures described in this document yields values for reduced viscosity and K-value that are comparable only when the concentrations of the solutions used are the same.
The experimental procedures described in this standard can also be used to characterize the polymeric fraction obtained during chemical analysis of a PVC composition. However, in these cases the calculated values for the reduced viscosity and K-value may not represent the actual values of the resin used to manufacture the composition, due to the impure nature of the recovered polymer fraction.
EUROLAB assists manufacturers with ISO 1628-2 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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