SH/T 0035-1990 Determination of Evaporation Loss of Rust-Preventive 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 0035-90
• Full title: Determination of Evaporation Loss of Rust-Preventive Greases
• English name: not provided in the available source
• Replacement relationship: not provided in the available source (the source text is marked "(200() year confirmed", the year number requires confirmation against the source standard (source-text extraction))
• Approval/implementation: approved by China Petrochemical Corporation 1991-03-27, implemented 1992-04-01

2. Scope of application and non-applicability

• This standard specifies a method for determining the evaporation loss of rust-preventive greases under test conditions.
• This standard applies to rust-preventive greases.
• Not applicable: not provided in the available source.

3. Method principle

A sample container holding a certain amount of test sample is placed in a constant-temperature air bath at 107℃±2℃ for 3h, and the evaporation loss is calculated from the mass loss of the test sample.

4. Reagents and materials (purity / preparation)

Not provided in the available source.

5. Apparatus and equipment

• 5.1 Constant-temperature air bath (4.1): a double-walled square electrically heated constant-temperature air bath, see Figure 1. Except for the heating part, the internal height is not less than 290mm, and both the length and width are greater than 300mm. It is provided with a hinged door, on which there is a square double-glazed window with a side length of 100mm. Inside the bath, more than one air inlet and more than one outlet for hot air and vapor are provided. The air inlets are designed at the bottom near the side walls in symmetrical positions, with a total area of not less than 130 (unit requires confirmation against the source standard (source-text extraction)); the outlets for hot air and vapor are designed at the top near the side walls in symmetrical positions, with a total area of 130～1290 (unit requires confirmation against the source standard (source-text extraction)). In the center of the constant-temperature air bath, an aluminum rotating disk with a diameter of about 250mm is installed (Figure 2), driven by a motor, with a rotation speed of 5～6r/min.
• 4.2 Thermometer: total-immersion stick type, with the following technical conditions:
  • Temperature range: 100～115℃
  • Immersion depth: total immersion
  • Minimum division: 0.5℃
  • Long-line division: 1℃
  • Numbered division: 5.0℃
  • Indication error: maximum 0.5℃
  • Allowable heating temperature of expansion chamber: 140℃
  • Overall length: 150±5mm
  • Stem diameter: 7±0.5mm
  • Mercury bulb diameter: not greater than the stem diameter
  • Length of graduated portion: 50±10mm (requires confirmation against the source standard (source-text extraction))
• 4.3 Sample container: dimensions as shown in Figure 3, made of aluminum or glass. A low-form weighing bottle may be used instead.
• 4.4 Desiccator.

6. Recommended operating conditions

• Constant-temperature air bath temperature: 107℃±2℃
• Rotating disk speed: 5～6r/min
• Test time: 3h
• An ordinary oven must not be used for arbitration tests.

7. Sampling and test sample preparation

• Sample according to the requirements of GB/T 4756 or SH/T 0229.
• Weigh the test sample 1.5g (weighed to 1mg), spread it evenly in a previously weighed sample container, and the spread area shall be not less than three quarters of the bottom area of the sample container.

8. Analysis procedure

• 5.1 Turn on the constant-temperature air bath, hang the thermometer vertically on the crossbar mounted on the main shaft of the rotating disk, so that it is about 20mm inside from the edge of the disk, and the mercury bulb at the bottom is about 6mm from the disk. Adjust the temperature of the constant-temperature air bath so that it is maintained at 107℃±2℃.
• 5.2 Wash and dry the sample container, place it in the constant-temperature air bath or an ordinary oven, keep it at 107℃±2℃ for 30min, then take out the sample container, place it in a desiccator to cool for not less than 30min, and then weigh it, weighed to 1mg.
• 5.3 Sample according to the requirements of GB/T 4756 or SH/T 0229, and weigh the test sample 1.5g (weighed to 1mg), spread it evenly in a previously weighed sample container, and the spread area shall be not less than three quarters of the bottom area of the sample container.
• 5.4 Place the sample container holding the test sample on the grid of the rotating disk in the constant-temperature air bath, close the door, and make the rotating disk rotate at a speed of 5～6r/min. Place at 107℃±2℃ for 3h. Take out the sample container, place it in a desiccator to cool for not less than 30min, and then weigh it, weighed to 1mg.
• Note: When the measured evaporation loss is relatively small (below 2%), an ordinary oven may be used instead of the constant-temperature air bath. Considering that the temperature uniformity of an ordinary oven is not ideal and there are unsafe factors, during the test it is advisable to place 2 sample containers, with the thermometer hung at the center position of the containers and the mercury bulb about 6mm from the bottom (requires confirmation against the source standard (source-text extraction)). An ordinary oven must not be used for arbitration tests.

9. Qualitative and quantitative determination and calculation formula

The evaporation loss of the test sample X[% (m/m)] is calculated according to the following formula:

X = [(m₁ − m) / m₁] × 100

Where:

• m₁——mass of the test sample before the test, g;
• m—— mass of the test sample after the test, g.

(Note: The formula symbols in the original text source-text extraction contain noise; the above is restored according to the context and requires confirmation against the source standard (source-text extraction).)

10. Precision

The reliability of the test results is judged according to the following provisions (provisional): When the evaporation loss of the test sample is less than or equal to 2% (m/m), the difference between two results obtained by the same operator in repeated determinations shall not be greater than 0.2% (m/m).

11. Report

Take the arithmetic mean of two results from repeated determinations as the test result, rounded to one decimal place.

12. Referenced documents

• GB/T 4756 Petroleum liquids — Manual sampling
• SH/T 0229 Sampling method for solid and semi-solid petroleum products
• Reference adoption: the evaporation loss test method in clause 5.17 of Japanese Industrial Standard JIS K 2246-1989 "Rust-Preventive Oil"

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