SH/T 0129-1992 Test method for ignition residue of petroleum waxes and petroleum greases

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

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

• Method number: SH/T 0129-92
• Full title: Test method for ignition residue of petroleum waxes and petroleum greases
• English name: not provided in the available source
• Replacement relationship: From the date of implementation of this standard, the former national standard GB 9927-88 "Test method for ignition residue of petroleum waxes and petroleum greases" is void.
• Adoption relationship: This standard equivalently adopts the Japanese Cosmetic Raw Material Standard 1982 edition "Test method for ignition residue of petroleum waxes and petroleum greases".
• Technical administration and drafting: This standard is technically administered by Fushun Petrochemical Research Institute; it is drafted by Fushun Petrochemical Research Institute.
• Approval and implementation: Approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20.

2. Scope of application and non-applicability

• This standard specifies the determination of the inorganic content of a sample by the ignition residue test method.
• It is applicable to the determination of the impurity contained in petroleum waxes and petroleum greases—inorganic content.
• It is also applicable to the determination of the content of inorganic substances present as components in organic substances or the content of impurities present in volatile inorganic substances.
• Specified limit is 0.05%(m/m).
• Not applicable: not provided in the available source.

3. Method principle

Take a certain amount of sample, wet it with a small amount of sulfuric acid, heat slowly, carbonize, wet again with sulfuric acid, heat, carbonize, ignite to constant mass, and determine the amount of residue.

4. Reagents and materials (purity / preparation)

• Sulfuric acid: analytical reagent.
• Other reagents and materials: not provided in the available source.

5. Apparatus and equipment

• 4.1 Electric hot plate: used for carbonization heating of the sample.
• 4.2 High-temperature furnace: temperature can be adjusted arbitrarily within the range 200 to 600℃, with controlled temperature of 500℃±25℃.
• 4.3 Evaporating dish or crucible: capacity 50ml, made of ceramic or quartz material.
• 4.4 Analytical balance: sensitivity 0.1mg.
• 4.5 Upper-pan balance: sensitivity 0.2g.

6. Recommended operating conditions

• High-temperature furnace controlled temperature: 500℃±25℃.
• First ignition time of the crucible: 1h.
• Second and subsequent ignition time: 30min.
• Ignition ashing time: 2h (adoption note [3]: the original method did not specify the ignition time; this standard specifies it as 2h).
• Cooling: after taking it out and placing it on an asbestos board outside the furnace to cool for 3min, move it into a desiccator and cool to room temperature (about 30min).
• Constant mass criterion: the mass difference between two consecutive weighings is less than 0.4mg.
• Adoption note [1]: the original method specified the controlled temperature as 450 to 550℃; this standard changes it to 500℃±25℃.
• Adoption note [2]: the original method specified the sample amount as 1g±0.1g; this standard changes it to 5g±0.5g.

7. Sampling and sample preparation

• 5.3 Weigh the sample 5g±0.5g on an upper-pan balance and place it into a crucible.
• Other sampling and sample preparation content: not provided in the available source.

8. Analysis procedure

• 5.1 Soak the crucible in cleaning solution, then rinse it clean with distilled water, and place it in an oven to dry for later use.
• 5.2 After the high-temperature furnace is raised to 500℃±25℃, place the clean crucible into the furnace and ignite for 1h. Take out the crucible and place it on an asbestos board outside the furnace, cool for 3min, then move it into a desiccator, cool to room temperature (about 30min), and weigh on an analytical balance. Repeat this operation (the second and subsequent ignition time is shortened to 30min) until the mass difference between two consecutive weighings is less than 0.4mg.
• 5.3 Weigh the sample 5g±0.5g on an upper-pan balance, place it into a crucible, then add a small amount of sulfuric acid (about 20 drops) to wet the sample, and place it on an electric hot plate to heat slowly for carbonization (because the carbonization process produces strongly irritating white fumes of sulfur trioxide, the operation should be carried out in a fume hood). After the white fumes disappear, remove the crucible from the electric hot plate, add sulfuric acid again (about 10 drops) to wet it, place the crucible on the electric hot plate again and heat slowly; after complete carbonization to loose black carbon, move the crucible into the high-temperature furnace and ignite and ash at 500℃±25℃ for 2h, then take out the crucible and place it on an asbestos board outside the furnace to cool for 3min, then move it into a desiccator, cool to room temperature (about 30min), and weigh on an analytical balance. Repeat this operation (the second and subsequent ignition time is 30min) until the mass difference between two consecutive weighings is less than 0.4mg.

9. Qualitative and quantitative determination and calculation formula

• 6.1 Calculation formula: the ignition residue A is calculated according to the following formula: A = m1 / m × 100
• Where:
  • A—— ignition residue, %(m/m);
  • m1—— amount of residue after ignition, g;
  • m—— sample amount, g.
• 6.2 Report the sulfate ash content as a mass percentage, with the result taken to two decimal places.
• Note: the original text 6.2 expresses it as "sulfate ash content", which is inconsistent with the wording of the standard title "ignition residue"; requires confirmation against the source standard (source-text extraction).

10. Precision

not provided in the available source.

11. Report

• 6.2 Report the sulfate ash content as a mass percentage, with the result taken to two decimal places.
• Other reporting requirements: not provided in the available source.

12. Referenced documents

• GB 9927-88 "Test method for ignition residue of petroleum waxes and petroleum greases" (void from the date of implementation of this standard).
• Japanese Cosmetic Raw Material Standard 1982 edition "Test method for ignition residue of petroleum waxes and petroleum greases" (equivalently adopted).
• Other referenced documents: not provided in the available source.

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