GB/T 4893.3-2020Test of surface coatings of furniture—Part 3: Determination of resistance to dry heat (English PDF)

1 Scope

This Part of GB/T 4893 specifies the method for determination of resistance to dry heat.

This Part is applicable to all cured surfaces of painted furniture and the tests on the surface of unused furniture or test panel. This Part is not applicable to leather and textile surfaces.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 3190, Wrought aluminium and aluminium alloys - Chemical composition limits

GB/T 3505, Geometrical Product Specifications (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters

GB/T 10610, Geometrical product specifications(GPS) - Surface texture:

Profile method - Rules and procedures for the assessment of surface texture

JB/T 9262, Liquid-in-glass industrial thermometers and laboratorial thermometers

JB/T 9263.4, The types and fundamental sizes of solid-stem common thermometers

3 Terms and definitions

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

8 Sample

9 Test steps

9.1 After the specimen is pretreated, immediately put it in an environment with a temperature of (23±2)°C to carry out the test.

9.2 The test surface shall be placed horizontally. It shall be large enough to accommodate the number of tests required. Between adjacent test surfaces, between the periphery of the test surface and the edge of the template, at least 15mm space shall be left. At the same time at the unfolded as the test, the periphery of the test surface shall be separated by at least 50mm. If there is any reason to believe that the performance of the test surface may change, two identical tests shall be carried out at the same time.

9.3 Before the test, use a cleaning cloth (see 6.1) to wipe the test surface gently.

9.4 Use an oven (see 7.3) to heat the heat source block (see 7.2) to at least 10°C higher than the specified test temperature. The test temperature shall be selected from the following temperatures according to the test requirements: […]