GB/T 40262-2021Metal coating fabric—Determination of metal layer adhesive force—Tape method (English PDF)

1 Scope

This Document specifies the test method for measuring the metal layer adhesive force of the metal coating fabric by the tape method, including the method of colour fastness to rubbing tester and the manual press roller method.

This Document is applicable to all kinds of metal coating fabrics.

2 Normative References

The following documents are essential to the application of this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.

GB/T 2792 Measurement of Peel Adhesion Properties for Adhesive Tapes

GB/T 3920 Textiles - Tests for Colour Fastness - Colour Fastness to Rubbing

GB/T 20631.2 Pressure Sensitive Adhesive Tapes for Electrical Purposes - Part 2: Methods of Test

GB/T 33729 Textiles - Tests for Colour Fastness - Cotton Rubbing Cloth

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply.

7 Preparation of Specimen

7.2 Take a roll of pressure-sensitive adhesive tape; evenly pull out and remove a length (2 ~ 3 turns) of the initial section; and then cut the pressure-sensitive adhesive tape with a length of about 120mm.

7.3 Fold one end of the tape about 10mm as the free end; and stick it on the surface of the metal layer of the sample in the centre. Hold the press roller, roll it back and forth twice in the length direction; the reciprocating speed is (10±0.5) mm/s; and it is flattened without air bubbles. If there are bubbles, prepare the specimen again

7.4 After the specimen is prepared, it shall be stored in the test environment for 0.5h ~ 1.0h before starting the test.

8 Test Procedures

9 Evaluation of Test Results

Use natural light for inspection. If the indoor light is insufficient, use fluorescent for lighting. The distance between the light source and the specimen is 1.0m~1.2m; and the illuminance on the surface of the specimen is (400±100) lx. For visual inspection, the line of sight of the inspector shall face the surface of the specimen; and the straight-line distance between the eyes and the surface of the specimen is about 500mm.

Visually inspect the tested the adhesive tape; describe according to the level of adhesive force. Refer to the evaluation example diagram (see Appendix A); observe the adhesion of the metal particles; and determine the level of adhesive force. Due to the subjective factors of evaluation, it is recommended that at least two people evaluate the specimen. Description of level of adhesive force:

Level-1: Tested tape adheres to metal shavings that are connected into flakes, and the flake metal shavings are dense.

Level-2: Tested tape adheres to metal shavings that are connected into flakes, and the flake metal shavings are sparse. […]