SH/T 0322-1992 Determination of harmful particles 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 0322-92
• Chinese title: Determination of harmful particles in lubricating grease
• English title: not provided in the available source
• Replacement relationship: replaces ZB E36014-88
• First issued: 1965 year
• Reference adoption: American Society for Testing and Materials standard ASTM D1404-83 "Test Method for Harmful Particles in Lubricating Grease"
• Technical committee: Technical committee of the Research Institute of Petroleum Processing
• Drafting organization: Research Institute of Petroleum Processing responsible for drafting

2. Scope of application and non-applicability

• Applicable to lubricating grease, and also applicable to lubricating grease of any color or filled lubricating grease, or other semi-solid, viscous liquid substances.
• Not applicable: not provided in the available source.

3. Method principle

Place the lubricating grease between two clean, highly polished plastic sheets; under a certain pressure, make one plastic sheet rotate 30° relative to the other. When the lubricating grease contains particles harder than the plastic sheets, special arc-shaped scratches are made on one or both plastic sheets. The total number of scratches is used to estimate the relative content of such solid particles.

4. Reagents and materials (purity / preparation)

• Petroleum ether: 60~90 ℃, analytical reagent.
• Plastic sheet: made of polymethyl methacrylate (see Figure 2), 25 mm × 25 mm × 10 mm.

5. Apparatus and equipment

• Steel test apparatus (see Figure 1), composed of the following parts:
  • 1— plastic sheet; 2— flat key; 3— smooth body; 4— spring seat; 5— load screw; 6— pointer; 7— spring; 8— lower clamp; 9— upper clamp; 10— washer; 11— handle; 12— top cover; 13— double-ended stud; 14— wing nut.
• In Figure 1, the two plastic sheets 1 are placed in the square cavities of clamps 8 and 9, and are tightly joined together in parallel positions; the upper clamp 9 is a component of the top cover assembly 9~13.
• Remove the four screws on the top cover; the top cover assembly can slide axially out of the main body bore, but is prevented from rotating by two opposing shoulder portions.
• Use the serpentine spring 7, spring seat 4 and load screw 5 to apply pressure to the plastic sheets through clamp 8.
• The load screw can also serve as the base of the apparatus; the pointer 6 on the spring seat 4 is used to indicate the compression value of the spring, thereby indirectly measuring the pressure acting between the two plastic sheets.
• The upper clamp 9 can rotate 30° under pressure.
• The clamp 9 can be fixed by a winged screw inserted through the top cover 12, so that 13 cannot rotate. To rotate the upper clamp and plastic sheet, the winged screw must first be loosened, and the handle 11 rotated.
• A washer 10 should be placed between the clamp 9 and the top cover 12 to facilitate rotation.
• Magnifying glass or projection viewer (see report in Section 6).
• Fine file, soft brush or chamois leather, scraper, small beaker (see test procedure in Section 5).

6. Recommended operating conditions

• Pressure: about 1.37 MPa (14 kgf/cm², original written as "14kgf/cm?", requires confirmation against the source standard (source-text extraction)).
• Rotation angle: about 30° (original written as "about 30P", requires confirmation against the source standard (source-text extraction)).
• Sample amount: about 0.05~0.1 g.

7. Sampling and sample preparation

• Use a scraper to scrape off the surface of the sample, then take approximately equal amounts of sample from at least three locations not close to the container wall, place in a small beaker and stir evenly.
• Weigh about 0.05~0.1 g of sample and place it on the surface of the bottom plastic sheet.

8. Analysis procedure

5.1 Fully release the spring on the apparatus, unscrew the four top cover screws, remove the top cover assembly from the main body, as shown in Figure 1, insert the plastic sheets into the square cavities of clamps 8 and 9. The plastic sheets are wrapped in protective paper; tear off the protective paper on the outer surface, and use a fine file to round the edges around the outer surface (because sharp edges may scratch the surface of the opposing plastic sheet). There should be no scratches or dust on the two smooth surfaces; carefully remove any dust particles with a soft brush or chamois leather. To facilitate identification, number the plastic sheets on the surface, tear off the protective paper on the back, and wash the plastic sheets with filtered petroleum ether. When wiping the plastic test surface, be very careful to avoid causing scratches. 5.2 Use a scraper to scrape off the surface of the sample, then take approximately equal amounts of sample from at least three locations not close to the container wall, place in a small beaker and stir evenly. Weigh about 0.05~0.1 g of sample and place it on the surface of the bottom plastic sheet. Install the top cover assembly, rotate the load screw so that the pressure reaches about 1.37 MPa (14 kgf/cm²). Then loosen the winged butterfly rod on the top cover assembly, rotate the top handle to the end (about 30°). Then loosen the load screw, reduce the pressure, remove the top cover assembly, and carefully remove the plastic sheets from the two clamps. Observe after washing clean with petroleum ether.

9. Qualitative and quantitative and calculation formula

• Observe with a magnifying glass or projection viewer, and record the total number of scratches on the two plastic sheets.
• The resulting number of scratches is divided into three grades:
  • Grade one: fewer than 10 scratches;
  • Grade two: 10~40 scratches;
  • Grade three: more than 40 scratches.
• Calculation formula: not provided in the available source.

10. Precision

Not provided in the available source.

11. Report

Observe with a magnifying glass or projection viewer, and record the total number of scratches on the two plastic sheets. The resulting number of scratches is divided into three grades:

• Grade one: fewer than 10 scratches;
• Grade two: 10~40 scratches;
• Grade three: more than 40 scratches.

12. Referenced documents

• ASTM D1404-83 "Test Method for Harmful Particles in Lubricating Grease" (reference adoption).

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