GB/T 9266-2009Determination of scrub resistance of film of architectural paints and coatings (English PDF)

Foreword

This Standard replaces GB/T 9266-1988 "Determination of scrub resistance of film of architectural paints and coatings".

Compared with GB/T 9266-1988, the main technical differences in this Standard are as follows.

- the pH of the scrubbing medium is specified as 9.5 ~ 11.0 in this Standard, the pH of the scrubbing medium is specified as 9.5 ~ 10.0 in the previous edition;

- the substrate is specified as non-asbestos fiber cement board in this Standard, the substrate is specified as glass plate in the previous edition;

- two models are specified for parallel testing in this Standard, three models are specified for parallel testing in the previous edition;

- modified the preparation method of the test board;

- added the provision that pre-drip about 2mL of scrubbing medium in the sample test area before the test;

- modified the method of result assessment. the test end point in this Standard is the number of times of scrubbing until the specified number of times the coating is damaged until the substrate is exposed or the coating is just damaged to expose the substrate, the number of times of scrubbing in the previous edition is specified till whether the coating is exposed to the specified number of times to reveal the color of the primer.

1 Scope

This Standard specifies the method for determining the scrub resistance of architectural coatings that can make flat coatings.

2 Normative references

The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard.

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

GB/T 9271, Paints and varnishes standard panels for testing (GB/T 9271-2008, ISO 1514:2004, MOD)

GB/T 9278, Temperatures and humidities for conditioning and testing of paint specimens (GB/T 9278-2008, ISO 3270:1984, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning and testing, IDT)

3 Instruments and materials

4 Sampling

According to GB/T 3186, take a representative sample of the testing product.

5 Preparation of test board

6 Operation steps

6.4 Use two test boards to perform the parallel test of the same sample.

7 Result assessment

7.1 Scrub to the prescribed number of times. When at least one of the two test boards is not damaged to expose the substrate, it shall be assessed as "passing".

8 Test report

The test report shall contain the following information. […]