GB/T 3535-2006 in English

《GB/T 3535-2006石油产品倾点测定法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
本标准规定了测定石没产品倾点的方法，同时也叙述了测定燃料油、重质润滑油基础和含有残渣燃料组分的产品下倾点的试验步骤。

WARNING - The use of this standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1 Scope

This standard specifies a method for the determination of the pour point of petroleum products. The test procedure for the determination of the lower pour point (see 6.10) of fuel oils, heavy lubricant base oil and products containing residual fuel components are also described .
Note: A method for the pour point of crude oils is under development. The pour point of crude oils may be determined by the general procedure described in this standard. But some crude oils may need a modified pretreatment to avoid the loss of volatile material.
The precision in this standard was derived on a sample matrix that did not include crude oils (See notes in Chapter 8).

2 Terms and Definitions

The following terms and definitions are applicable to this standard.
Pour point
Lowest temperature at which a sample of petroleum product will continue to flow when the product is cooled under specified conditions.

3 Method Summary

After preliminary heating, the sample is cooled at a specified rate and examined at intervals of 3°C for flow characteristics. The lowest temperature at which movement of the sample could be observed is recorded as pour point.

4 Reagents and Materials

4.1 Sodium chloride (NaCl), crystals.
4.2 Calcium chloride (CaCl2), crystals.
4.3 Carbon dioxide (CO2), solid.
4.4 Coolant liquid: acetone, methanol or Petroleum naphtha.
4.5 Wiping fluid: acetone, methanol or ethanol.

Foreword I
1 Scope
2 Terms and Definitions
3 Method Summary
4 Reagents and Materials
5 Apparatus (See Figure 1)
6 Procedure
7 Expression of Results
8 Precision
9 Test Report
Appendix A (Normative) Thermometer Specifications