HG/T 2502-19935201 Grease (English PDF)

5.1 Determination of appearance

Open the package and conduct visual inspection under natural lighting.

5.2 Determination of cone penetration

5.2.1 Determination of non-working cone penetration

Conduct the determination in accordance with the method specified in paragraphs 2 to 4 in method A of the 1st section, GB 269, including.

a. the gas is exhausted for 1 h under the residual pressure not greater than 400 Pa;

and

b. the test temperature is 25 ± 5°C.

The results shall be rounded off to 3 significant figures.

5.2.2 Determination of working cone penetration

Conduct the determination in accordance with the method specified in paragraphs 2 to 3 and paragraph 5 in method A of the 1st section of GB 269, including the exhaust conditions and test conditions for the specimens the same as 5.2.1.

The results shall be rounded off to 3 significant figures.

5.3 Determination of oil separation and volatile content

5.3.1 Apparatus

5.3.1.1 Electric constant-temperature drying oven. the maximum working

temperature 300°C; the temperature control accuracy ± 2°C.

5.3.1.2 Analytical balance. the maximum load 200 g; the sensitivity 0.1 mg.

5.3.1.3 Desiccator. containing allochroic silicagel or anhydrous calcium chloride

desiccant.

5.3.1.4 Steel mesh oil separation measuring equipment. as shown in Figure 2.

5.7.1.3 Screen. stainless steel screen, mesh size 1.0 to 1.3 mm.

5.7.1.4 Tripod. made of iron.

5.7.2 Test procedure

Weigh approximately 10 g of the specimen to place on the stainless-steel screen, whose coverage is a circle with a diameter of 2.5 cm. Place the screen on the tripod;

heat underneath it cautiously with a combustion lamp not to let the flame run to the above of the screen. When the specimen starts to decompose or becomes volatile, use a second combustion lamp to ignite the gas discharged. When the combustion lamps are both withdrawn, observe whether the flame extinguishes immediately. If it does not extinguish immediately, the specimen is not self-extinguishing, and stop the test. If it extinguishes, continue to heat until the specimen is red hot, and ignite once again. if it still extinguishes, the specimen is self-extinguishing, or else, it is not self-extinguishing, and then stop the test.

5.7.3 Judgment of test results

Conduct 3 tests in parallel and take two results identical as the final test result.

5.8 Determination of corrosivity

Conduct the determination in accordance with the method specified in SY 2710, including.

the material of the sheet metal is steel no. 45 of the dimensions 50 mm × 50 mm × (3.5 to 5) mm.

5.9 Determination of waterproofing

5.9.1 Reagent and solution

Cobalt chloride water solution. containing 25 g of cobalt chloride per 100 mL of the solution.

5.9.2 Apparatus and materials

5.9.2.1 Electric constant-temperature drying oven. the maximum working

temperature 150°C and the temperature control accuracy ± 1°C.

5.9.2.2 Oxidation vessel. glass made, the diameter 30 ± 2 mm and the height 12 ± 1

5.9.2.3 Water bath.

5.9.2.4 Scraper.

5.9.2.5 Filter paper. Ø 25 ± 1 mm.

with this Standard; and if a re-inspection is necessary, it shall be conducted within 6 weeks after receiving the products.

6.7 When there is any dispute between the supplier and the purchaser on the product

quality, it shall be settled by both sides through consultation or a statutory quality inspection department through arbitration.

7.1 Marking

Each package of the products shall be marked legibly and indelibly, indicating product name, type, grade, batch number, net weight, manufacturing date and manufacturer name.

7.2 Packaging

The products shall be packaged in a closed container lined with a plastic bag; each package shall be provided with a conformity certificate, indicating batch number and a reference of this Standard.

7.3 Transportation

The products shall be transported as a non-toxic non-dangerous article. During transportation, they shall be protected from rain and exposure to sunlight.

7.4 Storage

The products shall be stored in a dry and ventilated place, which shall be isolated from combustion sources and keep away from heat sources. The storage life of the products at -5 to 40°C is 2 years from the date of manufacture. When the products are past the storage life, they can be re-inspected in accordance with this Standard; if the re-inspection results still conform to this Standard, they can still be usable.