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GB/T 23989-2009Determination for the solvent resistance of coatings by solvent rubs (English PDF)

涂料耐溶剂擦拭性测定法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 2, 2009

Implementation date

February 1, 2010

Scope

GB/T 23989-2009 is the English-translated version of 涂料耐溶剂擦拭性测定法.

GB/T 23989-2009 is the Chinese standard "Determination for the solvent resistance of coatings by solvent rubs". Its scope clause reads: This standard specifies a test method for determining the solvent resistance of single or composite coating systems of paints, varnishes, or related products by solvent rubs.

This test method is applicable to the determination for the solvent resistance of coatings (that undergo chemical reactions during curing) by solvent rubs. This method includes Methods A and B. Method A is manual rub, and Method B is instrumental rub.

Its clauses include terms and definitions; principle; sampling; test plates and test environment; test methods.

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Document preview — GB/T 23989-2009

National Standard of the People's Republic of China

ICS: 87.040
Classification: G 50

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sampling
6 Test plates and test environment
7 Test methods
8 Test report

1 Scope

This standard specifies a test method for determining the solvent resistance of single or composite coating systems of paints, varnishes, or related products by solvent rubs.

This test method is applicable to the determination for the solvent resistance of coatings (that undergo chemical reactions during curing) by solvent rubs.

This method includes Methods A and B. Method A is manual rub, and Method B is instrumental rub.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

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

GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing (GB/T 20777-2006, ISO 1513:1992, IDT)

3 Terms and definitions

For the purposes of this standard, the following term and definition apply:

3.1 double rub

complete back-and-forth rub on the surface of a coating with solvent-soaked absorbent cotton or other agreed materials

4 Principle

For coatings that undergo chemical reactions during curing, such as epoxy resin, alkyd resin and polyurethane resin coatings, the film will become more solvent-resistant after curing. The solvent resistance of the film may be determined by rubbing it with absorbent cotton soaked in suitable solvents or other agreed materials.

5 Sampling

Take a representative sample of the product to be tested, as described in GB/T 3186.

Examine and prepare the sample for testing, as specified in GB/T 20777.

6 Test plates and test environment

6.1 Substrates

Unless otherwise agreed, the substrates shall meet the requirements of GB/T 9271, with minimum dimensions of 70mm×150mm.

6.2 Preparation and coating

Unless otherwise agreed, each substrate shall be prepared according to the requirements of GB/T 9271, and then coated by the specified method with the product or system under test. At least 2 test plates shall be prepared for each specimen.

6.3 Drying and conditioning

The coated test plates shall be dried and cured under the specified conditions.

6.4 Conditioning and test temperature of specimens

Before the test, the test plates shall be conditioned for at least 1h at a temperature of (23±2)°C and a relative humidity of (50±5)%; unless otherwise specified, the test shall be carried out at 18°C~27°C.

7 Test methods

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

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