SH/T 0107-1992 Test method for human sweat detergency of rust-preventive oil

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 / supersession relationship

• Standard number: SH/T 0107-92
• Chinese title: Test method for human sweat detergency of rust-preventive oil
• English title: not provided in the available source
• Supersession relationship: not provided in the available source (there is only an editor's note stating that the referenced standard SH/T 0219 now has the standard number SH/T 0218, which is not a supersession relationship of this standard)
• Approval/implementation: approved by China Petrochemical Corporation 1992-06-06, implemented on 1993-01-01
• Reference adoption: fingerprint removal test method in clause 5.31 of Japanese Industrial Standard JIS K2246-89 "Rust-preventive oil"

2. Scope of application and non-applicability

• This standard specifies a method for testing the human sweat detergency performance of rust-preventive oil.
• This standard applies to rust-preventive oil.
• Non-applicability: not provided in the available source.

3. Method principle

A test specimen printed with artificial sweat is swing-washed in the sample 2min, placed under the conditions of 23℃±3℃ for 24h, and the corrosion condition of the sweat-printed surface of the test specimen is observed.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• Methanol: chemically pure (5.1)
• Sodium chloride: chemically pure (5.2)
• Urea: chemically pure (5.3)
• Lactic acid: chemically pure, 85% (5.4)

4.2 Preparation of artificial sweat (6.1)

• Distilled water: 500mL
• Methanol: 500mL
• Sodium chloride: 7g±0.1g
• Urea: 1g±0.1g
• Lactic acid: 4g−0.1g (requires confirmation against the source standard (source-text extraction): the source text reads "4g- 0. Ig", suspected to be 4g±0.1g)

4.3 Materials

• Test specimen: meets the material and specification requirements for test specimens in the SH/T 0218 A method, but the two holes are punched on the short side of the test specimen (4.2.1)
• Solvent: solvent naphtha for the rubber industry, meeting the requirements of SH 0004, or 60—90℃ petroleum ether (4.2.2)
• Glass plate: 150mm×150mm×5mm (4.2.3)
• Gauze: degreased gauze, 35mm×35mm (4.2.4)
• Rubber stopper: the diameter of the sweat-printing surface of the rubber stopper is approximately 26mm (4.2.5)
• Sandpaper (or abrasive cloth): corundum sandpaper (or abrasive cloth) of grit 240 (4.2.6)

5. Apparatus and equipment

• Test specimen swing-washing apparatus (4.1.1): see the figure below (figure in the source text)
  • Composition: 1— base; 3— support arm; 3— test specimen support rack; 4— reciprocating movement device; 5— connecting rod; b— reversible motor; 7— eccentric wheel (requires confirmation against the source standard (source-text extraction): the numbering is suspected to be erroneous)
  • Swing-washing reciprocating speed: 30 times per minute to ±2 times per minute
  • Swing-washing distance: approximately 50mm (one way) (requires confirmation against the source standard (source-text extraction): the source text reads "approximately 50}")
• Constant-temperature oven: explosion-proof type, capable of maintaining a constant temperature of 120℃±2℃ (4.1.2)
• Weight: mass 1kg±0.02kg (4.1.3) (requires confirmation against the source standard (source-text extraction): the source text reads "silicon weight")
• Desiccator: desiccant is silica gel (4.1.4)
• Simple humidifying tank: a desiccator with a small amount of distilled water at the bottom may be used (4.1.5)
• Container: a glass tank of approximately 80mm×110mm×130mm (4.1.6) (requires confirmation against the source standard (source-text extraction): the source text reads "130 two")

6. Recommended operating conditions

• Swing-washing reciprocating speed: 30 times per minute to ±2 times per minute (4.1.1a)
• Swing-washing distance: approximately 50mm (one way) (4.1.1b)
• Constant-temperature oven temperature: 120℃±2℃ (4.1.2)
• Humidifying tank placement conditions: 23℃±3℃, 24h (3, 7.6)
• Drying time: 5min (7.2)
• Swing-washing time: 2min (3, 7.3, 7.4, 7.5)

7. Sampling and test specimen preparation

• Prepare five test specimens in accordance with the method specified in SH/T 0218 clause A, and they must be used within 8h (6.3).
• The sweat-printing surface of the rubber stopper is roughened with No. 240 sandpaper (or abrasive cloth), washed successively with neutral detergent and distilled water, and then dried (6.2).

8. Analytical procedure

• 7.1 Place 32 pieces of gauze overlapped on a glass plate, drip artificial sweat 1.5mL at the center, then place a weight on the rubber stopper by an appropriate method, place the rough surface of the rubber stopper facing downward on the overlapped gauze for about 2s, and then immediately move it together with the weight to the center of the test specimen and print for about 1s. The gauze must be replaced after each printing. For each test specimen, the time required from the start of dripping artificial sweat onto the gauze to the completion of printing is 20s±5s. (requires confirmation against the source standard (source-text extraction): the source text "about 2. after" is suspected to be "after about 2s")
• 7.2 Within 5s after printing, place the test specimen in a constant-temperature oven at 120℃±2℃ to dry for 5min, then take it out and place it in a desiccator to cool to room temperature.
• 7.3 Among the five test specimens, three test specimens are successively swing-washed in the sample 800mL and the solvent 800mL using the test specimen swing-washing apparatus for 2min, and then dried with hot air.
• 7.4 Among the remaining two test specimens, one test specimen is successively swing-washed in 50℃ or more of 800mL methanol and 800mL solvent using the test specimen swing-washing apparatus for 2min, and dried with hot air. The human sweat detergency rate of this test specimen is defined as 100%.
• 7.5 The last test specimen is swing-washed in 800mL solvent using the test specimen swing-washing apparatus for 2min, and dried with hot air. The human sweat detergency rate of this test specimen is defined as 0%.
• 7.6 Place the above five treated test specimens in a simple humidifying tank and leave them under 23℃±3℃ for 24h.
• 7.7 Take out the test specimens and visually inspect whether there is corrosion at the printed areas of the test specimens.

9. Qualitative and quantitative determination and calculation formula

• Result judgment (8): The sweat-printed area of the test specimen whose human sweat detergency rate is defined as 0% must rust, and the test specimen whose human sweat detergency rate is defined as 100% must have no rust; otherwise, the test must be redone. If the sweat-printed areas of the remaining three test specimens all have no corrosion, the test specimens are judged as "no corrosion"; otherwise, they are judged as "corrosion".
• Calculation formula: not provided in the available source.

10. Precision

Not provided in the available source.

11. Report

If the test specimen has no corrosion, the sample is reported as "qualified"; otherwise, it is reported as "unqualified". (9)

12. Referenced documents

• SH 0004 Solvent naphtha for the rubber industry
• SH/T 0218 Preparation method of test specimens for rust-preventive grease testing (editor's note: the original standard number was SH/T 0219, the current standard number is SH/T 0218, and the current standard title is "Preparation method of test specimens for rust-preventive 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 reference Q&A