SH/T 0082-1991 Test method for dropping point of rust-preventive oils and 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

• Standard number: SH/T 0082-91
• Chinese title: Test method for dropping point of rust-preventive oils and greases
• English title: not provided in the available source
• Replacement relationship: not provided in the available source
• Other: approved by 1991-11-26, implemented by 1992-12-01; confirmed in year (200q) (requires confirmation against the source standard (source-text extraction), original text is “(confirmed in year 200q)”)
• Reference adoption: dropping point test method of clause 5.21 in Japanese Industrial Standard JIS K 2246-89 “Rust-preventive oil”

2. Scope of application and non-applicability

• This standard specifies the method for testing the dropping point of rust-preventive oils and greases.
• This standard applies to rust-preventive oils and greases.
• Not applicable: not provided in the available source.

3. Method principle

At the specified temperature, after heating the test specimen coated with the sample for 1h, it is naturally cooled under 23℃±3℃, and the phenomenon of whether the oil film flows down is observed to determine the dropping point of the rust-preventive oil or grease.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• 5.1 Petroleum ether: analytical grade, boiling range 60～90℃ (original text “[unreadable characters]90`C”, requires confirmation against the source standard (source-text extraction))
• 5.2 Anhydrous ethanol: chemical grade

4.2 Materials

• 4.2.1 Metal test specimen: steel sheet meeting the requirements of method A in SH/T 0218, dimensions 80mm × 60mm × 1～3mm, see the figure below (original text “see the figure below”, figure not provided)
• 4.2.2 Absorbent cotton
• 4.2.3 Emery cloth: grain size No. 240 (original text “241, No.”, requires confirmation against the source standard (source-text extraction))
• 4.2.4 Hook: made of stainless steel wire or nickel-copper alloy with diameter 1mm, total length about 90～100mm (original text “diameter is 1,”, unit requires confirmation against the source standard (source-text extraction))
• 4.2.5 Adhesive tape: insulating tape, width 25mm, which after being peeled off the test specimen leaves no adhesive on the surface of the test specimen

5. Apparatus and equipment

• 4.1.1 Electric thermostatic blast oven: constant temperature range room temperature～100℃, temperature fluctuation ±2℃ (original text “temperature fluctuation 12`C”, requires confirmation against the source standard (source-text extraction))
• 4.1.2 Electric furnace: 500W
• 4.1.3 Vernier caliper: graduation value 0.02mm, length 0～120mm
• 4.1.4 Thermometer: 0～150℃, graduation value 1℃ (original text “0[unreadable separator]1500C, graduation value 19C0”, requires confirmation against the source standard (source-text extraction))
• 4.1.5 Beaker: 1000mL (original text “1000ML”)
• 4.1.6 Engraving knife: single-edge blade

6. Recommended operating conditions

• Temperature maintained by the thermostatic oven: according to product specification requirements, maintain in a constant-temperature air bath at 40℃±2℃ or 80℃±2℃ for 1h (original text “8090[unreadable sign]2℃”, requires confirmation against the source standard (source-text extraction))
• Cooling temperature: 23℃±3℃
• Sample temperature during film coating: rust-preventive oil adjusted to 23℃±3℃; rust-preventive grease heated to about 80℃ to completely melt it
• Immersion time: rust-preventive oil 1min; rust-preventive grease immersed until the test specimen temperature reaches the sample temperature
• Pull-up speed: about 100mm/min
• Rust-preventive grease film thickness: 38μm±5μm (original text “381m[unreadable sign]5Fnn”, requires confirmation against the source standard (source-text extraction)), measure film thickness according to SH/T 0218

7. Sampling and sample preparation

• 6.1 Polish, clean, and blow-dry two metal test specimens according to method SH/T 0218 A.
• 6.2 Use a vernier caliper to measure on the test specimen a distance of 22mm from the lower end of the test specimen, and use an engraving knife to draw a reference line parallel to the bottom edge at this position, see the figure below (figure not provided).
• 6.3 Apply adhesive tape to the portion from the lower end of the test specimen up to 25mm.
• 6.4 Coat the test specimen with adhesive tape applied.
  • 6.4.1 Film coating of rust-preventive oil sample: take 500mL sample and pour it into a beaker, stir thoroughly, and remove bubbles floating on the surface. Adjust the sample to 23℃±3℃, use a hook to vertically immerse the test specimen treated according to clauses 6.1～6.3 into the sample for 1min, then pull it up at a speed of about 100mm/min.
  • 6.4.2 Film coating of rust-preventive grease sample: heat the sample to about 80℃ to completely melt it, take 500mL and place it in a beaker, use a hook to vertically immerse the test specimen treated according to clauses 6.1～6.3 into the completely melted sample until the temperature of the test specimen reaches the sample temperature, adjust the temperature so that the film thickness is 38μm±5μm (measure film thickness according to SH/T 0218), then pull it up at a speed of about 100mm/min.

8. Analysis procedure

• 7.1 Along the upper end of the adhered tape, use an engraving knife to draw a slit in the coating film, then peel off the adhesive tape.
• 7.2 With the film-removed portion of the coated test specimen facing downward, use a hook to vertically suspend the test specimen in an electric thermostatic blast oven, and maintain it in a constant-temperature air bath at 40℃±2℃ or 80℃±2℃ for 1h according to product specification requirements.
• 7.3 Take out the test specimen and cool it at a temperature of 23℃±3℃. Observe whether there is any change in the relative position between the edge line of the remaining cut film and the reference line to determine whether the coating film has flowed down.

9. Qualitative and quantitative determination and calculation formula

• 8.1 If the coating films of both test specimens do not flow down, it indicates that the sample's dropping point is qualified at this test temperature.
• 8.2 If the coating films of both test specimens flow down, it indicates that the sample's dropping point is unqualified at this test temperature.
• 8.3 If the coating film of one of the two test specimens flows down, the test needs to be repeated.
• Calculation formula: not provided in the available source.

10. Precision

Not provided in the available source.

11. Report

Report the test temperature and whether the dropping point is qualified or unqualified.

12. Referenced documents

• SH/T 0218 Preparation method of test specimens for rust-preventive oil and grease testing

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