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GB/T 4893.2-2020 English PDF (GBT4893.2-2020)

GB/T 4893.2-2020 English PDF (GBT4893.2-2020)

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GB/T 4893.2-2020: Test of surface coatings of furniture--Part 2: Determination of resistance to wet heat

This Part of GB/T 4893 specifies the method for determination of resistance to wet heat on furniture surface. This Part is applicable to all cured surfaces of painted furniture, and tests conducted on the surface of unused furniture or test panels.
GB/T 4893.2-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 97.140
Y 80
Replacing GB/T 4893.2-2005
Test of surface coatings of furniture - Part 2:
Determination of resistance to wet heat
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle ... 6
5 Test conditions ... 6
6 Reagents and materials ... 6
7 Instruments and equipment... 7
8 Sample ... 8
9 Test steps ... 8
10 Test data processing ... 10
11 Test report ... 10
Bibliography ... 12
Test of surface coatings of furniture - Part 2:
Determination of resistance to wet heat
1 Scope
This Part of GB/T 4893 specifies the method for determination of resistance to wet heat on furniture surface.
This Part is applicable to all cured surfaces of painted furniture, and tests conducted on the surface of unused furniture or test panels.
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. 3.1 test panel
6.3 Water
Use deionized water or distilled water.
6.4 Insulation pad
It is made of inorganic materials. The thickness is about 25mm. The size is about 150mm??150mm, or larger.
7 Instruments and equipment
7.1 Thermometer
A thermometer that complies with JB/T 9262 and JB/T 9263.4, can be inserted into the bottom center of the heat source block (see 7.2) OR other temperature measuring equipment; the accuracy is ??1??C.
7.2 Heat source block
The heat source block (see Figure 1) is made of AlMgSi (including alloy 6060 and alloy 64430) specified in GB/T 3190. The roughness Ra value of the bottom surface shall be (2??1) ??m. Determine according to GB/T 3505 and GB/T 10610. The tolerances are as follows:
- Length: ??0.2mm;
- Angle: ??2??.
7.3 Oven
An oven capable of heating the heat source block to at least 10??C higher than the test temperature.
7.4 Diffuse light source
On the test area, provide uniform diffused light and reach (1200??400)lx illuminance in the test area. Diffuse natural light or diffuse artificial light can be used.
NOTE: Daylight shall not be affected by surrounding trees. When using artificial daylight, it is recommended that the correlated color temperature of the light is (6500??50)K, color rendering index Ra is greater than 92 and use a colorimetric box that complies with GB/T 9761-2008 to obtain this light.
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: 55??C, 70??C, 85??C, 100??C. Then transfer the heat source block to the insulation pad (see 6.4).
9.5 Insert a thermometer (see 7.1) or other temperature measuring equipment into the center hole of the heat source block. If the temperature is lower than the specified test temperature, the heat source block shall be placed in the oven again until it reaches 10??C higher than the specified test temperature. 9.6 Place the white polyamide fiber cloth (see 6.2) in the center of the test surface. Spray (2??0.2) mL of distilled water or deionized water evenly on the cloth surface (see 6.3). Make it cover the entire area of the white polyamide fiber cloth.
NOTE: It is advisable to use a scaled dropper for spraying.
9.7 When the temperature of the heat source block reaches the specified test temperature ??1??C, immediately place the heat source block in the center of the white polyamide fiber cloth.
9.8 After placing for 20min, remove the heat source block.
9.9 When the test surface has cooled, use a cleaning cloth to dry the test surface.
9.10 Record the location and temperature of each test surface.
9.11 Place the test surface for 16h~24h without interference.
9.12 Use a cleaning cloth to wipe each test surface. Under the light source condition, carefully check the damage of each test surface, such as fading, tarnishing and discoloration, blistering, swelling and other defects. For this purpose, the surface is illuminated with a diffuse light source (see 7.4) from different angles, including angle combination, to reflect light from the test surface to the observer's eyes. The observation distance shall be 0.25m~1.0m. Changes caused by the test shall also be determined by touching the surface.

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