SH/T 0319-1992 Determination of Soap Content in Lubricating Grease

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

• Standard number: SH/T 0319-1992 (the original main text writes "SH/T 031992", source-text extraction lacks a hyphen, requires confirmation against the source standard (source-text extraction))
• Chinese name: Determination of Soap Content in Lubricating Grease
• English name: not provided in the available source
• Replacement relationship: replaces ZB E36011-88
• First issued: 1954 year
• Technical committee: Technically administered by the Research Institute of Petroleum Processing
• Drafting organization: Drafted under the responsibility of the Research Institute of Petroleum Processing
• Approval/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 acetone precipitation method for determining the soap content of lubricating grease.
• This standard is applicable to the determination of lubricating grease.
• Non-applicable scope: not provided in the available source.

3. Method principle

After dissolving the lubricating grease in benzene, acetone is used to precipitate the soap from the benzene solution of the lubricating grease, and then the soap content is determined by the gravimetric method.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• 4.1.1 Benzene: analytical reagent.
• 4.1.2 Acetone: analytical reagent.

4.2 Materials

• Quantitative filter paper.
• Preparation method: not provided in the available source.

5. Apparatus and equipment

• 5.1 Burette: 50mko (as in the original text, suspected to be 50mL, requires confirmation against the source standard (source-text extraction))
• 5.2 Conical flask: 125 or 150mL.
• 5.3 Funnel: 60 angle, diameter 50~70mm ("60 angle" is suspected to be 60°, requires confirmation against the source standard (source-text extraction))
• 5.4 Wash bottle: 250~500mL.
• 5.5 Reflux condenser.
• 5.6 Water bath or electric furnace with concealed heating wire.
• 5.7 Drying oven or constant-temperature oven: heating temperature 100–105°% (suspected to be 100–105℃, requires confirmation against the source standard (source-text extraction))
• 5.8 Scraper.
• 5.9 Glass rod: length 150–200mm, diameter 3–4mm, both ends fire-polished round.
• 5.10 Desiccator.

6. Recommended operating conditions

• Dissolution heating: heat slightly on a water bath or on an electric furnace with concealed heating wire; benzene must not be allowed to boil.
• Drying temperature: 100–105℃ (in the original text, the places 6.1 and 7.4 are 100–105°C).
• Drying time: 1.5~2h.
• Standing time: 1h (in the original text, 7.3 "stand for Ih", requires confirmation against the source standard (source-text extraction)).
• Weighing precision: accurate to 0.0002g.
• Constant mass criterion: the difference between two consecutive weighings is not greater than 0.001g.

7. Sampling and sample preparation

• 6.2 Use a scraper to scrape off the surface of the sample, then take approximately equal amounts of sample from at least three places not close to the container wall, place them together in a porcelain evaporating dish, mix carefully and uniformly, and then cover with a watch glass.
• 6.3 Take sample 1~2g, weigh accurately to 0.0002g, and place it into a conical flask (take out the filter paper in the flask and record the flask number).

8. Analytical procedure

• 6.1 At the neck of a clean and dry 125mL conical flask, place a piece of filter paper, place it in an oven at 100–105℃ for 1.5–2h, take it out and cool it in a desiccator to room temperature, and weigh its mass accurately to 0.0002g. Repeat the operations of drying, cooling and weighing until the difference between two consecutive weighings is not greater than 0.001g.
• 7.1 Add benzene 5~10mL to the conical flask containing the sample, then attach a reflux condenser, heat slightly on a water bath or on an electric furnace with concealed heating wire (benzene must not be allowed to boil) until completely dissolved, and then cool the solution to room temperature.
• 7.2 Use a burette to add acetone 50mL dropwise into the benzene solution of the sample, and swirl the conical flask to stir; at this time the conical flask should not be lifted off the table.
• 7.3 After allowing the conical flask to stand for 1h, wet the filter paper (originally weighed together in the flask) with acetone, use this filter paper to filter off the upper liquid, then wash the soap in the flask and on the filter paper several times with hot acetone until the oil is completely removed.
• 7.4 After washing is complete, place the filter paper with soap together with the conical flask with soap in an oven at 100–105℃ for 1.5–2h, take them out and cool in a desiccator to room temperature, then weigh their mass accurately to 0.0002g. Repeat the operations of drying, cooling and weighing until the difference between two consecutive weighings is not greater than 0.001g.

9. Qualitative and quantitative determination and calculation formula

The soap content of the sample X [% (m/m)] is calculated according to the following formula:

X = (m₁ − m₂) / m₃ × 100 − Y

Where:

• m₁——the mass of the conical flask and filter paper containing the precipitated soap, g;
• m₂——the mass of the clean and dry conical flask and filter paper, g;
• m₃——the mass of the sample, g;
• Y—— is the mass percentage of mechanical impurities in the sample determined according to SH/T 0330.

Note: The equation is garbled in the source transcription. The displayed reconstruction is provisional: verify the subscripts, numerator and denominator against the original before using the formula.

10. Precision

• Repeatability: the difference between two results obtained by repeated determination by the same operator shall not be greater than 1%.
• Reproducibility: not provided in the available source.

11. Report

Take the arithmetic mean of the two results of repeated determination as the soap content of the sample.

12. Referenced documents

• SH/T 0330 Determination of Mechanical Impurities in Lubricating Grease (Extraction Method)

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 reference Q&A