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See Chinese contents: GB/T 3401-2007 GB/T 3401-2007: Determination of the viscosity of Poly (vinyl chloride) resins in dilute solution using capillary viscometers
This Standard specifies conditions for the determination of the reduced viscosity (also known as viscosity) and K-value of PVC resins. It is applicable to resins in powder form which consist of homopolymers of the monomer vinyl chloride and copolymers, terpolymers, etc., of vinyl chloride with one or more other monomers, but where vinyl chloride is the main constituent. The resins may contain small amounts of unpolymerized substances (e.g. emulsifying or suspending agents, catalyst residues, etc.) and other substances added during the course of the polymerization. This Standard is not applicable, however, to resins having a volatile-matter content in excess of 0.5%, when determined in accordance with GB/T 2914. In addition to this, it is not applicable to resins which are not entirely soluble in cyclohexanone.
