GB/T 1632.2-2025 "Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 2: Poly(vinyl chloride) resins" replaces GB/T 3401-2007. It modifies and adopts relevant international standards while incorporating adjustments based on the actual conditions of the domestic industry, thereby improving the standard system for determining the viscosity of polymer dilute solutions. This standard is applicable to poly(vinyl chloride) homopolymers, vinyl chloride binary and ternary copolymer resins, and specifies the method for determining the viscosity of their dilute solutions using capillary viscometers. It clarifies technical details such as sample preparation, reagent requirements, instrument specifications, and temperature control. It covers the calculation methods for reduced viscosity and K-value, and standardizes the criteria for test precision and data validity.
| Status | Incoming | ||
|---|---|---|---|
| CCS | G31 | ICS | 83.080.20 |
| Release Date | 2025-10-05 00:00:00 | Implementation Date | 2026-05-01 00:00:00 |
