SH/T 0800-2007 Determination of Wax Drop Point

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Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: SH/T 0800-2007
• Chinese title: Determination of Wax Drop Point
• English title: Standard test method for dropping point of waxes
• Replacement relationship: not provided in the available source (the foreword only states modified adoption of ASTM D3954-94 (2004), and does not mention replacement of an old edition of the standard)
• Adoption relationship: modified adoption of ASTM D3954-94 (2004) "Determination of Wax Drop Point" (English version), redrafted according to ASTM D3954-94 (2004)
• Publication / implementation: published on 2007-08-01, implemented on 2008-01-01
• Proposal / administration / drafting: proposed by the National Technical Committee for Standardization of Petroleum Products and Lubricants; administered by Fushun Research Institute of Petroleum and Petrochemicals, Sinopec; drafting organization is Fushun Research Institute of Petroleum and Petrochemicals, Sinopec; main drafters Zhao Bin, Jie Bangfeng (name requires confirmation against the source standard (source-text extraction))

2. Scope of application and non-applicability

• 1.1 This standard specifies the test method for determining wax drop point, and is applicable to all types of non-liquid waxes, including paraffin wax, microcrystalline wax, polyethylene wax, blended wax and natural wax.
• 1.2 This standard may involve certain hazardous materials, equipment and operations, but it is not intended to address all safety issues associated with them; before use, the user is responsible for establishing appropriate safety and protective measures and formulating applicable management rules.
• Non-applicability: no explicit non-applicability clause is provided in the available source.

3. Method principle

• Chapter 3 Method summary: place the test sample in a cylindrical grease cup with a hole of diameter 2.8 mm at the bottom, heat it in air at a constant rate, and when the sample suspended at the bottom of the grease cup flows downward a distance of 19 mm and interrupts the photoelectric detection beam, the temperature at that time is the drop point of the sample.
• Chapter 4 Significance and use:
  • 4.1 When wax is heated, there is no obvious liquid-phase transition point, and wax has no true melting point; as the temperature rises, the wax gradually softens or its viscosity decreases, so in order to make test results reproducible, the softening temperature of the wax should be determined by a defined method.
  • 4.2 This standard can be used to determine the hardness of wax, and is also one of the elements for determining cargo uniformity or source of supply.

4. Reagents and materials (purity / preparation)

Not provided in the available source (the main body of the standard does not include a reagents and materials section).

5. Apparatus and equipment

The apparatus used in this standard for determining drop point shall meet the requirements of clauses 5.1, 5.2, and 5.3, including a control unit with digital temperature display, a matching heater unit, a sample cup sleeve, and accessories.

• 5.1 Control unit: shall be capable of automatically maintaining the temperature of the heater, controlling the heating rate with an accuracy of 0.1 ℃; and shall be capable of continuously controlling the temperature rise within the range of 25 ℃ to 250 ℃ at a heating rate of 2.0 ℃/min. The display shall be capable of recording the drop point with an accuracy of 0.1 ℃. When the detection beam in the sample triggers the photocell detector, the heater heating program shall be shut down and the drop point test result shall be automatically recorded. ("01C viscosity control", "2-00win", "25% +250%", etc. are source-text extraction noise, have been proofread according to context, and require confirmation against the source standard (source-text extraction))
• 5.2 Heater unit: shall be capable of heating the sample cup sleeve within the range of 25 ℃ to 250 ℃ at a heating rate of 2.0 ℃±0.3 ℃/min, and shall include a temperature sensing system for detecting the drop point with an accuracy of 0.1 ℃.
• 5.3 Sample cup sleeve: includes the sample grease cup and sleeve; the specifications and dimensions of the chrome-plated brass grease cup are given in GB/T 4929 (the source text writes EB/T4929, requires confirmation against the source standard (source-text extraction)); it shall be placed in a suitable sleeve so that the sample flows downward a distance of 19 mm to interrupt the detection beam, thereby indicating the drop point result.

6. Recommended operating conditions

• Heating rate: 2.0 ℃/min (8.2); heater unit heating rate 2.0 ℃±0.3 ℃/min (5.2).
• Starting temperature: preheat or cool the heater unit so that its temperature is lower than the expected drop point of the sample by 20 ℃ to 25 ℃ and maintain constant temperature (8.1). Note: if there is a dispute, the parties to the dispute shall agree on the exact starting temperature used.
• Temperature range: 25 ℃ to 250 ℃ (5.1, 5.2).
• Temperature display accuracy: 0.1 ℃ (5.1, 5.2).

7. Sampling and sample preparation

• Chapter 7 Sample preparation: heat and melt the test sample to above its melting temperature by 15 ℃ to 20 ℃, so that it becomes a free-flowing liquid. Place the sample grease cup on a glass slide (the source text says "placed on a glass slide", requires confirmation against the source standard (source-text extraction)), and pour in the molten sample until it is level with the upper rim of the cup. Place the sample grease cup filled with sample at room temperature for 2 h, then start the test.
• Chapter 6 Apparatus preparation: check whether the heater unit, sample grease cup and sleeve are clean and bright; a grease cup that has lost its luster or unclean apparatus can change the drop point of the sample. After each determination, check whether the apparatus needs cleaning.

8. Analytical procedure

• 8.1 Preheat or cool the heater unit so that its temperature is lower than the expected drop point of the sample by 20 ℃ to 25 ℃ and maintain constant temperature. Note: if there is a dispute, the parties to the dispute shall agree on the exact starting temperature used.
• 8.2 Place the sleeve containing the sample in the proper position in the heater unit, ensuring that the detection beam can pass smoothly through the slit on the sleeve. When the instrument status light is stable, indicating that the sample and heater have reached equilibrium at the current temperature, start heating at a heating rate of 2 ℃/min. The instrument automatically heats until the drop point appears, and the drop point temperature value is displayed on the display.
• 8.3 Immediately remove the sample cup sleeve to end the test. Check to determine whether the sample has passed through the beam slit and whether there has been a situation in which the pre-trigger was not actuated. Check the drop point apparatus to ensure that it is clean and free of particles or residue.
• 8.4 Place the upper rim of the sample cup downward on a hard surface, punch out the residual sample in the sample grease cup, and clean the sample grease cup. Use a tool such as a scraper to gently rotate and scrape off residual material around the sample grease cup.

9. Qualitative and quantitative determination and calculation formula

• Chapter 9 Report: take the result recorded on the instrument digital display as the drop point, accurate to 0.1.
• Calculation formula: not provided in the available source (this method is a direct instrument reading and has no calculation formula).

10. Precision

Use the following criteria to judge the precision of test results (95% confidence level):

• 10.1 Repeatability: for repeated determinations of the same sample by the same operator using the same instrument, the difference between the two results obtained shall not exceed 0.5 ℃.
• 10.2 Reproducibility: for determinations of the same sample by different operators in different laboratories, the difference between the two independent results obtained shall not exceed 1.5 ℃.
• 10.3 Bias: the procedure of this standard has no bias, because the wax drop point result is defined by this method.

11. Report

• Take the result recorded on the instrument digital display as the drop point, accurate to 0.1 (Chapter 9).
• Other report format requirements: not provided in the available source.

12. Referenced documents

• GB/T 4929 Determination of Drop Point of Lubricating Grease (the source text writes GB/1 4929, EB/T4929, requires confirmation against the source standard (source-text extraction))
• Note: the foreword states that ASTM D3954-94 (2004) is the source document for modified adoption.

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick Q&A reference