GB/T 15331-2020 in English
VALIDTest method for water vapor transmission rate of pressure-sensitive tapes
- Issued on:2020-11-19
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 15331-2020压敏胶粘带水蒸气透过率试验方法》由TC185（全国胶粘剂标准化技术委员会）归口，TC185SC1（全国胶粘剂标准化技术委员会压敏胶制品分会）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
GB/T15331-2020 standard subdivides the water vapor transmission rate test of pressure-sensitive adhesive tape into two methods for the first time: vertical transmittance and cross-sectional transmittance. The main technical upgrades are reflected in:
| Improvement dimensions | 1994 edition | 2020 edition |
|---|---|---|
| Test classification | Single method | Vertical/cross-sectional dual method |
| Instrument accuracy | Undefined | Electronic balance 0.0001g |
| Environmental control | Brief description | (38±1)℃,RH90-95% |
Key technical points of the test method
1. Vertical water vapor transmission rate test
Adopt test box-ring cover combination device, key parameters:
- Test area: 0.002462m²
- Balance judgment: 3 consecutive Δ value changes ≤10%
- Calculation formula: WVTRvertical=(Δaverage×24)/(T×0.002462)
2. Cross-sectional water vapor transmission rate test
Specialized 5mm wide annular specimen, characteristic parameters:
- Test perimeter: 0.2167m
- Calculation formula: WVTRcross-sectional=(Δaverage×24)/(T×0.2167)
Recommendations for standard implementation
Operation precautions
- Desiccant activation: Heat at 200℃ for 2h and then pass through a 2.80mm sieve
- Specimen preparation: Pressurize with a 1000g weight for 10min
- Edge sealing: PVC or aluminum foil tape is recommended
Solutions to common problems
| Problem phenomenon | Possible causes | Solutions |
|---|---|---|
| Large data fluctuations | Poor sealing | Check the fit of edge sealing materials |
| Unable to achieve balance | Unstable ambient humidity | Calibrate the humidity sensor in the test chamber |
Technology evolution analysis
The revision of this standard reflects three development trends in the adhesive tape industry:
- Refined test dimensions: Distinguish vertical/cross-sectional penetration paths
- Equipment standardization: Clarify that the test box material is aluminum/stainless steel
- Improved data reliability: Increase the accuracy requirements of electronic balances
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