GB/T 42268-2022 in English
VALIDRubber，ethylene-propylene-diene(EPDM)—Evaluation procedure
- Issued on:2022-12-30
- Implemented on:2023-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 42268-2022乙烯-丙烯-二烯烃橡胶（EPDM） 评价方法》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC6（全国橡胶与橡胶制品标准化技术委员会合成橡胶分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
1. Standardization background and technological evolution
GB/T42268-2022 is a Chinese national standard revised and formulated based on the international standard ISO4097:2020, which mainly focuses on the evaluation method of ethylene-propylene-diene rubber (EPDM). This standard combines the actual application needs of my country and makes localized adjustments to many technical details.
2. Comparative analysis of standard frameworks
| Standard dimensions | ISO4097:2020 | GB/T42268-2022 | Difference analysis |
|---|---|---|---|
| Reference standards | ISO247:2006 | GB/T4498.1-2013, GB/T4498.2-2017 | Enhanced adaptability |
| Vulcanization characteristic test | Disc oscillating rheometer and rotorless rheometer | Added mixing procedure details | Method optimization |
| Ash determination | Muffle furnace method and thermogravimetric analysis | New national standard sample operating oil information | Application scope expansion |
3. Detailed interpretation of the standard
3.1 Sampling and sample preparation
According to the provisions of GB/T15340, take about 1.5kg of laboratory samples and perform corresponding sample preparation. Ensure sample uniformity and representativeness.
3.2 Physical and chemical tests of raw rubber
- Mooney viscosity determination: Use the GB/T1232.1 method, and it is recommended to use a Mooney viscometer.
- Volatile content test: GB/T24131.1 hot roller method or GB/T24131.2 infrared drying unit automatic analyzer can be used.
- Ash content determination: GB/T4498.1-2013 muffle furnace method or thermogravimetric analysis is recommended.
4. Implementation suggestions and precautions
4.1 Standard test formula selection
Select the appropriate formula according to the EPDM type (oil-filled or non-oil-filled). The formula table clearly states the specific requirements for different application scenarios.
4.2 Mixing program optimization
- Laboratory internal mixer preferred: It is recommended to use a single-stage or two-stage mixing program (method A1/A2) to ensure uniform dispersion of the compounding ingredients.
- Open mill alternative: Only used when there is no internal mixer, and special attention should be paid to the control of mixing temperature and time.
4.3 Vulcanization property test
Select a disc oscillating vulcanizer or a rotorless vulcanizer according to the rubber type, and conduct the test strictly in accordance with the specified conditions (160℃±0.3℃).
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