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GB/T 9271-1988《Paints and varnishes standard test board》

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Home> Standard> GB/T 9271-1988《Paints and varnishes standard test board》

GB/t 9271-1988 "Paints and varnishes standard test plates" specifies the standard test plates used in the general test method of Paints, varnishes and related products and the surface preparation procedures before painting.

Number: GB/T 9271-1988Name: Paints and varnishes standard test boardStatus: Abolish

This standard is equivalent to the international standard ISO1514-1984 (paint and cleaning-one standard test panel)

This standard stipulates: It is necessary to ensure that the clean surface of the treated standard test plate is not directly touched or in contact with other dirt before painting. Clean gloves should usually be worn before disposal.

The test plates or substrates used for specific industrial application tests should be processed strictly according to the actual industrial application requirements. In such cases, it is necessary to indicate:

a. Regarding the test plates to be used, the relevant parties should reach an agreement and stipulate the details of the materials used and processing procedures in advance.

b. All these should be stated in the test report.

1. Theme content and scope of application

This standard specifies the standard test panels used in general test methods for paints, varnishes and related products and their surface treatment procedures before painting.

2. Reference standards

GB 710 Technical conditions for good carbon structural steel thin steel plates

GB 912 Technical conditions for ordinary carbon structural steel and low alloy structural steel thin copper plates

GB 1923 Hard fiberboard

GB 2477 Abrasive grain size and composition

GB 2520 Electroplated tin steel sheets and strips

GB 3880 Aluminum and aluminum alloy plates

GB 6682 Laboratory water specifications

GB 9775 Ordinary plasterboard

GB ll614 float glass

Construction standard 25 asbestos cement pressure plate for electricians

3. Copper plate

3.1 Materials

Ordinary steel plates should comply with the technical requirements of GB912.

The thickness and other dimensions of the test plate shall comply with the provisions of the test method.

Good structural steel plates should comply with 08 steel and grade Z specified in GB710, with a thickness of not less than 0.8mm [and can meet the requirements of the Ericksen cupping test with a punching depth of not less than 10mm].

Other dimensions of the test plate shall comply with the provisions of the test method.

3.2 Storage of test panels

3.2.1 Before plate making, the test plate should be soaked and stored in neutral light mineral oil or short solvent (no additives) to prevent the test plate from rusting.

3.2.2 Or wrap the test panel with paper soaked in mineral oil and store it.

3.2.3 Or store in a desiccator.

3.3 Solvent cleaning method for making boards

Wipe the sleeves on the test plate, and use xylene or solvent gasoline to clean the sleeve traces; you can also use non-toxic, non-acid- and alkali-free solvents that evaporate quickly. The cleaned test plate can be dried by evaporation of the solvent or washed with a clean silk cloth. Wipe dry. If not applied immediately, store in a desiccator.

3.4 Polishing (polishing) French bait

The grinding (polishing) operation is a method of obtaining a flat and smooth surface by removing surface unevenness and surface dirt that cannot be removed by solvent cleaning by sandpaper.

In order to ensure that the original surface layer is ground away, the thickness of the surface layer removed should be no less than 0.7m, calculated based on the reduction in mass of the test plate (the mass per unit area of ​​5~6g/m² is approximately equal to 0.7m thick) .

The polished test panels should be cleaned according to the operating procedures specified in 3.3 before use. Unless otherwise specified, sanding shall be done by dry sanding with No. 400 water sandpaper as specified. The test plate is polished according to the following operating procedures:

a. Grind straightly and evenly back and forth in the parallel direction on any side of the test plate.

b. Grind straightly and evenly back and forth in the direction perpendicular to the first direction until the original surface is worn away.

c. Polish in a circular motion with a diameter of about 80 to 100 mm until the circles formed on the surface overlap.

Note: If there are special requirements for the surface treatment of the test plate, other operating procedures and methods may be specified for implementation.

5. Jet blast cleaning of legal boards

Cold-rolled steel plates used in general test methods should not be treated with spray blast cleaning.

When blasting and blasting hot-rolled low carbon steel, if there are no special provisions, blasting cleaning should be carried out according to the instructions in Appendix B. However, before cleaning, the test plate should be cleaned according to the operation specified in Article 3.3.

4.Tinplate

4.1 Materials

The tinplate plate should comply with the tin plating amount EA specified in GB2520, the hardness grade is T52, and the nominal thickness is O.30mm. The other dimensions of the test panel shall comply with the requirements of the test method.

4.2 Solvent cleaning method for making boards

Before painting the test panels, they should be cleaned according to the operations specified in 3.3.

4.3 Polishing (polishing) the French board

If a more uniform test surface is required than solvent-cleaned panels, it is recommended to grind the tinplate panels.

Unless otherwise specified, the grinding process should be done by dry grinding with 500-grade water sandpaper that meets the regulations.

The grinding operation should be carried out according to the operation specified in 3.4, but the grinding action should be much lighter to avoid the abrasive embedded in the surface. There should not be any tin plating layer on the test panel that is completely worn away.

The polished test panels should be cleaned according to the operations specified in 3.3 before use.

5.Aluminum plate

5.1 Materials

Aluminum plates should comply with the technical requirements of GB3880.

The thickness and other dimensions of the test plate shall comply with the provisions of the test method.

5.2 Solvent cleaning method for making boards

Before painting the test panels, they should be cleaned according to the operations specified in 3.3.

5.3 Grinding (polishing) the French board

The abrasive for grinding (polishing) should be composed of calcined alumina powder and comply with the regulations of GB2477, and should be mixed. Its specifications are as follows:

For particles exceeding 63m, the maximum is 10%;

Asbestos cement dust is harmful to human health. During the production, cutting and surface treatment of asbestos cement test panels, dust prevention measures should be taken, such as wearing appropriate masks and using wet cutting.

7.3 Surface treatment of test panels

Wipe off the dust on the test plate with a dry cloth, and immerse the test plate in clean water for a week. During this week, change the water once a day to make the pH value of the test plate close to 10. After taking out the test plate, use a scraper to remove the loose particles precipitated on the surface of the test plate. mud, then rinse with water and dry. Use No. 0 emery cloth or No. 200 water sandpaper to polish the test plate flat according to the operating procedures specified in 3.4, then rinse it with water, dry it, and place it in an environment of 23±2℃ and relative humidity (50±5)%. , stored for more than one week. Before using the test panel, the dust on the surface should be wiped clean.

The alkalinity of the test plate should be measured according to the method specified in Appendix C.

Note: In areas where it is difficult to maintain the standard conditions of temperature 23±2°C and relative humidity (50±5)% and for non-arbitration purposes, other conditions can be negotiated separately, but they should be noted in the test report.

8. Hardboard

8.1 Materials

Hard fiberboard should comply with the technical requirements of GB1923.

The thickness and other dimensions of the test plate shall comply with the provisions of the test method.

8.2 Preparation of test panels

The smooth surface of the test panel should be used as the front for testing coatings and related products.

Wipe the dust on both sides and edges of the test panel with a dry cloth, place it in an environment of 23±2℃ and relative humidity (50±5)%, and store it for more than three weeks. Before using the test panel, the dust on the surface should be wiped clean.

Note: In areas where it is difficult to maintain the standard conditions of temperature 23±2°C and relative humidity (50±5)% and for non-arbitration purposes, other conditions can be negotiated separately, but they should be noted in the test report.

9.Gypsum board

9.1 Materials

Paper plaster should comply with the technical requirements of GB9775.

The thickness of the test plate is 10mm, and other dimensions should comply with the provisions of the test method.

9.2 Preparation of test panels

Seal the edge of the test panel with appropriate tape, wipe away the dust with a dry cloth, place it in an environment of 23±2℃ and relative humidity (50±5)%, and store it for more than three weeks. Before using the test panel, the dust on the surface should be wiped clean.

Note: In areas where it is difficult to maintain the standard conditions of temperature 23±2°C and relative humidity (50±5)% and for non-arbitration purposes, other conditions can be negotiated separately, but they should be noted in the test report.


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