GB/T 21989-2008 specifies a method for determining the apparent viscosity of polyvinyl chloride (PVC) paste using the Severs rheometer, a pressurized extrusion-type rheometer. This instrument simulates coating or processing conditions under high shear rates and calculates viscosity by measuring the extrusion rate of the paste through a standard orifice under different pressures, making it more relevant to practical application scenarios.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | G32 | ICS | 83.080.20 |
| Release Date | 2008-06-04 00:00:00 | Implementation Date | 2008-12-01 00:00:00 |
