GB/T 29761-2022 in English
VALIDCarbon fibre—Determination of sizing content
- Issued on:2022-07-11
- Implemented on:2023-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
Price(USD)：
$120.00
$117.00
$117.00
《GB/T 29761-2022碳纤维 上浆剂含量的测定》由TC572（全国碳纤维标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Overview of the core revisions of the new standard
| Revision dimensions | 2013 version | 2022 version |
|---|---|---|
| Discontinued method | Two types of methods retained | Method B (wetting agent method) deleted |
| Sample mass | No clear upper limit | Specification is 3~5g |
| Decomposition detection | No correction factor | Added K value correction (▲4.5~5.5%) |
Analysis of key technical points
Enhanced term definitions
Updated the calculation formula S=K×(m6-m7)/(m8), adopted the powder metallurgy grade measurement accuracy grading system, and the equipment calibration referred to the international standard ISO 18844.
Instrument configuration requirements
- Soxhlet extraction apparatus must be equipped with a 200ml solvent circulation system
- Oven accuracy is improved to ±5℃ temperature control range
- High-purity inert gas purity standard upgraded to ≥99.996%
Experimental operation guide
| Steps | Method A-Soxhlet method | Method B-Pyrolysis method |
|---|---|---|
| 1. State adjustment | Uniform treatment (23±2)℃ RH50±10% equilibrium for 6h | |
| 2. Sampling control | Accurate to 0.1mg when there is no filter cartridge | Mandatory sample dish weighing and comparison twice |
| 3. Error control | Continuous result difference ≤0.2mg | K coefficient is included in the international ASTM D6488 correction system |
Implementation precautions
- It is forbidden to directly increase the oven temperature without boiling point verification
- Strictly implement isolation operation to prevent moisture absorption: RH≤40% window period to maintain process environment
- Transport and transfer in high temperature area: the test should be terminated when a color reaction is shown
Sample only — not a preview of GB/T 29761-2022
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