GB/T 1735-2009Paints and varnishes -- Determination of heat resistance (English PDF)

1 Scope

This Standard is one of a series of standards for sampling and testing of paints, varnishes and related products.

This Standard specifies a general method to determine the changes in the color and gloss of the coating film of a single coating or a composite coating system of a paint, varnish or related products at a specified temperature, the properties of blistering, cracking or peeling from substrates.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

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

GB/T 6742, Paints and varnishes - Bend test (cylindrical mandrel) (GB/T 6742-

2007, ISO 1519:2002, IDT)

GB/T 9271, Paints and varnishes standard panels for testing (GB/T 9271-2008, ISO

1514:2004, MOD)

GB/T 9279, Paints and varnishes - Scratch test (GB/T 9279-2007, ISO 1518:1992,

IDT)

GB/T 9753, Paints and varnishes - Cupping test (GB/T 9753-2007, ISO 1520:2006,

IDT)

GB/T 13452.2, Paints and varnishes - Determination of film thickness (GB/T

13452.2-2008, ISO 2808:2007, IDT)

GB/T 20624.1, Paints and varnishes - Rapid-deformation (impact resistance) tests -

Part 1: Falling-weight test, large-area indenter (GB/T 20624.1-2006, ISO 6272-

1:2002, IDT) in µm.

6 Operation steps

7 Test report

The test report shall include at least the following:

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

b) Indicate the standard number (GB/T 1735);

Annex A (normative)

Supplementary information needed

For this method to work properly, supplementary information on the items listed in this appendix shall be provided as appropriate.

The required information is best agreed upon by the parties concerned. It may be taken in whole or in part from international standards, national standards or other documents related to the product under test.

a) The nature, thickness and surface treatment of the substrate.

b) The method by which the test product is applied to the substrate, including drying conditions and times between coats in a multicoat system.

c) The time and conditions for coating drying (or baking) and curing (if applicable) prior to testing.

d) The thickness of the dry coating (in µm) and the measurement method specified in GB/T 13452.2 and whether it is a single coating or a multi-coating system.

e) The properties of the tested coating to be considered when evaluating the thermal resistance of the coating.

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