GB/T 9104-2022 in English
VALIDTest methods for industrial stearic acids
- Issued on:2022-12-30
- Implemented on:2022-12-30
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 9104-2022工业硬脂酸试验方法》由TC272（全国表面活性剂和洗涤用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
1. Standard Overview
GB/T9104-2022 "Test Method for Industrial Stearic Acid" is a national standard of the People's Republic of China, used to determine the various indicators of industrial stearic acid. This standard replaces the previous GB/T9104-2008 and introduces new determination methods and improved technical requirements.
2. Comparison of standard frameworks
| Standard version | Main changes | Scope of application |
|---|---|---|
| GB/T9104-2008 | - Basic determination method | Applicable to routine test of industrial stearic acid |
| GB/T9104-2022 | - Added determination methods for moisture and composition- Improved reagent usage and determination accuracy | Expanded to more industrial application scenarios |
3. Interpretation of key indicators
3.1 Iodine value determination
Iodine value is an important indicator for measuring the degree of unsaturation of stearic acid. It is determined by the addition reaction of iodine chloride and stearic acid. The standard specifies the reagent preparation method in detail (see 4.2), and the endpoint is determined by starch indicator.
3.2 Determination of saponification value
Saponification value reflects the reactivity of stearic acid with potassium hydroxide. Potassium hydroxide ethanol solution is used in the test, and the titration endpoint is determined by phenolphthalein indicator (see 5.3).
3.3 Determination of acid value
Acid value is an indicator of the free carboxylic acid content in stearic acid. It is determined by potassium hydroxide standard titration solution (see 6.1), and the result is obtained by calculation.
4. Implementation suggestions
- Prepare reagents and instruments strictly in accordance with the standard requirements to ensure accuracy.
- It is recommended to equip professional personnel for operation, especially when toxic reagents are involved.
- Calibrate the equipment regularly to ensure measurement accuracy.
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