GB/T 39693.6-2020 in English
VALIDRubber,vulcanized or thermoplastic—Determination of hardness—Part 6:Apparent hardness of rubber-covered rollers by IRHD method
- Issued on:2020-12-14
- Implemented on:2021-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 39693.6-2020硫化橡胶或热塑性橡胶 硬度的测定 第6部分：IRHD法测定胶辊的表观硬度》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC7（全国橡胶与橡胶制品标准化技术委员会橡胶杂品分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Interpretation of the core content of the standard
GB/T 39693.6-2020 is equivalent to the ISO 486:2018 international standard, which focuses on standardizing the hardness determination methods of three rubber rollers with different radii:
| Rubber roller radius range | Applicable method | Instrument configuration requirements |
|---|---|---|
| >50mm | Conventional/high/low hardness method | With cylindrical support base or universal joint |
| 4-50mm | Conventional/high/low hardness method | Fixed with special fixture or V-block |
| 0.8-4mm | Micro test method (CM) | Wax fixation or micro fixture |
Key technical points
IRHD hardness tester's indenter must meet the following requirements:
- Initial contact force: 0.3±0.02N
- Main pressure: 5.4±0.01N(conventional method)
- Indentation depth measurement accuracy: 0.01mm
Implementation precautions
A papermaking rubber roller inspection case shows:
- A rubber roller with a radius of 120mm needs to use Hardness tester with universal joint base
- Surface temperature equilibrium time must be ≥4 hours (ambient temperature 23±2℃)
- Three-point measurement result deviation＞3IRHD requires resampling
Standard Evolution Analysis
Main improvements compared to the 2003 version:
- Add micro test method for rubber rollers with smaller radius
- Clarify the mechanical tolerance requirements of curved surface support devices
- Supplement the quantitative indicators of environmental equilibrium time
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