GB/T 8813-2020 in English
VALIDRigid cellular plastics—Determination of compression properties
- Issued on:2020-07-21
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 8813-2020硬质泡沫塑料 压缩性能的测定》由TC48（全国塑料制品标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Analysis of the key points of standard revision
GB/T 8813-2020 is equivalent to the ISO844:2014 international standard. Compared with the 2008 version, the main revisions are:
- The test scope is extended to products with molded skin (thickness 10-50mm)
- Added contact extensometer method B for direct deformation measurement
- The unit of compression stress is uniformly changed to MPa
- Precision data adds inter-laboratory comparison results
Comparison of test methods
| Dimension | Method A (beam displacement method) | Method B (extensometer method) |
|---|---|---|
| Measurement principle | Indirect calculation through platen displacement | Direct measurement of specimen deformation |
| Applicable parameters | σm/σ10 | Elastic modulus E |
| Accuracy requirements | Displacement±0.1mm | Strain±1% |
| Deformation zero point correction | Linear regression or 250Pa benchmark required | Direct reading |
Key technical requirements
Specimen preparation specifications
The standard stipulates that the sample thickness should be (50±1)mm, and the preferred size is a 100mm×100mm regular quadrangular prism. For anisotropic materials, samples need to be taken in different directions for testing.
Test condition control
The compression rate needs to be maintained at 10% of the initial thickness of the compressed sample per minute, i.e. 5mm/min (50mm sample). The recommended state adjustment environment is (23±2)℃/(50±10)%RH.
Implementation recommendations
- For highly elastic materials, method B should be used to determine the elastic modulus.
- Anisotropic materials should be marked with the relationship between the pressure direction and the structural orientation.
- When the dispersion of the test results is >10%, each data must be reported separately.
- The force system of the testing machine should be calibrated regularly with standard weights.
Technology evolution analysis
This standard introduces the contact extensometer measurement method of ISO844:2014 for the first time, solving the pain point that traditional displacement measurement is affected by the rigidity of the equipment. By comparing the inter-laboratory comparison data of the 2008 version and the 2020 version, the reproducibility limit of the compression strength test was increased from 10% to 8%.
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