GB/T 2539-2023 in English
VALIDDetermination of melting point of petroleum waxes—Cooling curve method
- Issued on:2023-09-07
- Implemented on:2024-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 2539-2023石油蜡熔点的测定 冷却曲线法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC3（全国石油产品和润滑剂标准化技术委员会石油蜡类产品分会）执行，主管部门为国家标准委。
Introduction
1. Background and significance of the standard revision
GB/T 2539-2023 is a comprehensive update of the original standard GB/T2539-2008, mainly focusing on the cooling curve method for the determination of the melting point of petroleum wax. The new standard adds requirements for automatic instruments and improves quality control and precision indicators to meet the needs of modern petroleum product testing.
2. Comparison of standard frameworks
| Standard content | GB/T2539—2008 | GB/T2539—2023 |
|---|---|---|
| Scope of application | Not specifying specific types of petroleum wax | Clearly stipulates the applicability of paraffin and other types of petroleum wax |
| Measurement principle | Only mentions the cooling curve method | Increases result calculation content and improves the definition of stagnation period |
| Instrument requirements | Not specifying automatic equipment in detail | Adds technical parameters and performance requirements for automatic instruments |
3. Explanation of professional terms and practical applications
Petroleum wax melting point: refers to the temperature at which the first stagnation period appears on the cooling curve when the melted petroleum wax is cooled under specified conditions.
Cooling curve method: A method of determining the melting point by recording the temperature change during the cooling process of the sample and observing its stagnation period.
For example, in practical applications, when using an automatic melting point tester, the instrument will automatically collect and analyze temperature data and calculate the melting point result with an accuracy of up to 0.01°C.
4. Analysis of the Evolution of Standard Technology
The new standard reflects technological progress in the following aspects:
- Added automatic instrument content: Clarified the specific requirements for the measurement range, resolution and control system of the automatic melting point tester.
- Improved the quality control system: Introduced a regular calibration mechanism to ensure the long-term stability and accuracy of the equipment.
- Refined the precision indicators: Set repeatability and reproducibility standards for manual instruments and automatic instruments (0.10°C and 0.50°C, respectively).
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