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GB 9280-2008《Paints and varnishes stackability test》

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GB 9280-2008 "Paints and varnishes stackability test" measurement Paints or related products single coating, composite coating system after fully drying, under pressure conditions damage resistance performance.

Number: GB 9280-2008Name: Paints and varnishes stackability testStatus: Active

1 Scope

This standard is one of a series of standards related to the sampling and testing of paints, varnishes and related products.

This standard specifies the measurement of the resistance between two painted surfaces or between one painted surface and another surface after a single coating of paint or related products has been fully dried within the prescribed drying time. Method for measuring the resistance of specimens to damage when placed in contact under pressure.

The intent of this standard is to simulate the conditions in which painted items are stacked on top of each other.

2 Normative reference documents

The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether new versions of these documents can be used. For undated referenced documents, the latest edition applies to this standard.

GB/T 3186 Sampling of paints, varnishes and raw materials for paints and varnishes (GB/T 3186-2006, ISO 15528:2000, IDT)

GB/T 9271 Paints and varnishes Standard test panels (GB/T 9271-1998, eqv ISO 1514-1984)

GB/T 9278 Paints and varnishes and their raw materials -Temperatures and humidities for conditioning and testing, IDT

GB/T 13452.2 Paints and varnishes - Determination of paint film thickness (GB/T 13452.2-2008, ISO 2808:2007, IDT)

GB/T 20777 Paints and varnishes - Inspection and preparation of test specimens (GB/T 20777-2006, ISO 1513:1992, IDT)

3 Supplementary information required

For any particular application, the test methods specified in this standard need to be completed with supplementary information. The contents of the supplementary information are listed in Appendix A.

4 instruments

4.1 The test instrument consists of a base and a freely sliding pressure column. The maximum mass pressing [the diameter of the pressing column head is (50±1) mm] is 250g, and its lower surface should be able to be precisely combined with the upper surface of the test sample.

Note: It is recommended that a ball joint be used between the pressure column and its lower surface.

4.2 Load, a load suitable for the mass of the coating and intended use.

Note: Usually the suitable load mass range is 100g to 1000g.

5 sampling

According to the provisions of GB/T 3186, take a representative sample of the product under test (or each product in a multi-coating system).

Inspect and prepare test samples according to the provisions of GB/T 20777.

6 test panels

6.1 Substrate

Unless otherwise agreed, the substrate should comply with the provisions of GB/T 9271, and the actual substrate used should be selected as much as possible.

6.2 Treatment and painting

Unless otherwise agreed, each substrate shall be treated in accordance with the provisions of GB/T 9271 and then painted using the method specified for the product or system to be tested.

6.3 Drying and conditioning

Each coated test panel is dried (or heated) under specified conditions and left (if appropriate) for the specified time.

6.4 Preparation of test pieces

After the specified drying time, cut out at least six test pieces from the test plate as soon as possible. Each piece is (30±1) mm wide and the length is approximately 5 times the width.

The method used should avoid damaging the paint film and minimize deformation of the substrate to ensure it remains as flat as possible.

Before testing, the ridges on the edge of the test piece should be smoothed.

If it is not possible to prepare test pieces of the appropriate size as described above because the coating to be tested may be susceptible to damage, test pieces of size 100 mm x 75 mm may be used. In this case, the coating surface shall be calculated as specified in Chapter 8. The pressure experienced.

If it is determined that the interaction between the painted surface and another surface will be tested, a test piece of the other material of the same size should be prepared.

6.5 Thickness of coating

7 operating steps

7.1 Unless otherwise agreed, the test shall be repeated three times at a temperature of (23±2)°C and a relative humidity of (50±5)%.

7.2 The test pieces overlap each other at an angle of (90±2)°, and the surfaces are in close contact. The damaged areas on the specimens should be arranged to overlap as little as possible.

Note: A triangle ruler can be used to ensure that the test area is square.

7.3 Place the test piece on the base as above, so that the pressure column completely covers the contact square, place the agreed load on the pressure column, and then slowly place all the mass on the contact surface of the two test pieces. , and keep it for the specified time.

7.4 After the specified time, remove the pressure column, separate the test pieces, and check whether there is any damage to the coating on the contact surface, such as visible marks, adhesion of the test piece, and peeling of the coating.

8 Expression of results

If necessary, the pressure P (expressed in Pascals) on the coating surface can be calculated by the following formula:

Pressure P formula

In the formula:

P——Pressure, unit is Pascal (Pa);

m1——The overall mass of the pressure column, in grams (g);

m2——The mass of the load, in grams (g);

l——The width of the test piece, in millimeters (mm);

g——The acceleration of free fall, in meters per square second (m/s²) (approximately 10N/kg).

9 Precision

No precision data are currently available.

10 test report

The test report should at least include the following content:

a) All details necessary to identify the product under test;

b) Indicate the number of this standard;

c) Supplementary information involved in Appendix A;

d) Indicate the international standards, national standards, product regulations or other documents used as references for the information involved in c) above;

e) List the test results in accordance with the specified requirements and describe any damage;

f) Any difference from that specified in this test method;

g) Test date.

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