GB/T 40280-2021 in English
VALIDPlastics—Resins in the liquid state or as emulsions or dispersions—Determination of apparent viscosity using a single cylinder type rotational viscometer method
- Issued on:2021-08-20
- Implemented on:2022-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 40280-2021塑料 液态或乳液态或分散体系的树脂 用单筒旋转黏度计测定表观黏度》由TC15（全国塑料标准化技术委员会）归口，TC15SC4（全国塑料标准化技术委员会通用方法和产品分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Analysis of the core content of the standard
Measurement principle and technical characteristics
The standard adopts the single-cylinder rotational viscometer to measure the viscosity through the torque generated by the constant rotation of the rotor in the liquid. The key technical parameters include:
- Measuring range: 0.02-60,000Pa·s (covering low-viscosity resins to high-viscosity melts)
- Fluid type: Newtonian/non-Newtonian fluid (shear rate must be specified)
- Temperature control: ±0.2℃ constant temperature accuracy (20-100℃ gradient recommended)
Instrument Selection Guide
| Viscometer Type | Torque Range (μN·m) | Applicable Viscosity (Pa·s) | Typical Rotor |
|---|---|---|---|
| L Type | 67.3 | 0.02-200 | L1-L4 |
| R Type | 718.7 | 1-10,000 | R1-R7 |
| H(A) Type | 5,749.6 | 50-60,000 | R1-R7 |
Actual Application Case
When measuring epoxy resin, an R-type viscometer with an R3 rotor was selected. The viscosity was measured at a speed of 20r/min and was 4.25Pa·s, which meets the standard requirement of 45-95% of the measuring range.
Key control points of operation
- Bubble elimination: The rotor is immersed at a 45° angle and ultrasonically degassed
- Immersion depth: The rotor mark line must be completely immersed (>10mm from the bottom of the cup)
- Stable reading: Thixotropic samples need to record the time-viscosity curve
Technology evolution analysis
Compared with the old version of the standard, GB/T40280-2021 has the following major improvements:
- Newly added automated measurement requirements for digital viscometer
- Clarified the shear rate dependence of non-Newtonian fluids
- Extended high temperature test to 100°C (requires the use of a telescopic sleeve)
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