SH/T 0579-1994 Emulsion stability determination method

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 name / English name / replacement relationship

• Method number: SH/T 0579-94 (confirmed in 2004)
• Full name: Emulsion stability determination method
• English name: not provided in the available source
• Replacement relationship: not provided in the available source

2. Scope of application and non-applicability

• Scope of application: This standard applies to emulsions for metalworking.
• Non-applicability: not provided in the available source

3. Method principle

After shaking a sample of a certain concentration uniformly, let it stand for the time specified in the product specification, record the amount of pure oil floating on the upper layer of the sample and the amount of emulsified soap, and observe the state of the emulsion.

4. Reagents and materials (purity / preparation)

• Distilled water: at 20℃, the pH value is 6.0～7.0.
• Other reagents: not provided in the available source

5. Instruments and equipment

• Glass stoppered graduated cylinder: 100mL, minimum division 1mL.

6. Recommended operating conditions

• Shaking method: shake vigorously up and down, amplitude about 300mm, shake 60 times.
• Standing time: let stand for the time specified in the product specification.
• Other conditions: not provided in the available source

7. Sampling and sample preparation

• Add 50mL distilled water to a 100mL glass stoppered graduated cylinder, then add 5mL±1mL soluble oil, shake gently, then add distilled water to 100mL.

8. Analysis procedure

• 8.1 Add 50mL distilled water to a 100mL glass stoppered graduated cylinder, then add 5mL±1mL soluble oil, shake gently, then add distilled water to 100mL.
• 8.2 Stopper the stoppered graduated cylinder, shake vigorously up and down (amplitude about 300mm) 60 times to mix the oil and water thoroughly, then let stand.
• 8.3 After letting stand for the time specified in the product specification, carefully observe and record the milliliters of pure oil and emulsified soap in the upper layer and the state of the emulsion.

9. Qualitative and quantitative determination and calculation formula

• Reading and expression: the amount of the pure oil layer, mL; the amount of the emulsified soap layer, mL.
• Visual state: the liquid state below the emulsified soap is divided into the following three types:
  • W: pure water or almost pure water;
  • EW: light emulsion;
  • E: emulsion.
• Calculation formula: not provided in the available source

10. Precision

Judge the reliability of the test results according to the following provisions (95% confidence level).

• 6.1 Repeatability: for the difference between two results of repeated determination by the same operator, the amount of the floating pure oil layer shall not be greater than 0.5mL, and the amount of the emulsified soap layer shall not be greater than 0.5mL.
• 6.2 Reproducibility: for the difference between two results respectively submitted by different operators in different laboratories, the amount of the floating pure oil layer shall not be greater than 0.5mL, and the amount of the emulsified soap layer shall not be greater than 1.0mL.

11. Report

• 7.1 Standing time, h.
• 7.2 Express the result as the amount of the pure oil layer / the amount of the emulsified soap layer / the state of the emulsion.
• 7.3 Take the arithmetic mean of the two results of repeated determination of the pure oil layer and the emulsified soap layer under the same state as the determination result (report to one decimal place).

12. Cited 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 reference Q&A