GB/T 4893.2-2020 in English
VALIDTest of surface coatings of furniture—Part 2:Determination of resistance to wet heat
- Issued on:2020-07-21
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 4893.2-2020家具表面漆膜理化性能试验 第2部分：耐湿热测定法》由TC480（全国家具标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Background of Standard Revision and Technological Evolution
GB/T4893.2-2020, as the core part of the furniture surface paint film test series standards, replaces the 2005 edition of the standard. This revision mainly responds to the coordination requirements of ISO international standards, combines the development of new materials and new processes, and focuses on improving the following technical contents:
| Technical Dimensions | 2005 Edition | 2020 Edition |
|---|---|---|
| Terminology | Not clearly defined | Four new terms (test specimens, heat source blocks, etc.) |
| Heat source block requirements | Material requirements only | Added roughness (2±1μm) and tolerance (±0.2mm) |
| Light source conditions | Dual light source system | Simplified to a single diffuse light source (1200±400lx) |
Analysis of core test methods
Key requirements for instruments and equipment
The standard specifically specifies the technical parameters of the heat source block:
- Material: AlMgSi aluminum alloy (GB/T3190) must be used
- Bottom treatment: Ra value (2±1)μm, to be tested according to GB/T3505
- Temperature control: preheating must be 10℃ higher than the test temperature
Key points of the test process
- Sample pretreatment: 23±2℃/50±5%RH environmental balance for 48h
- Heat source block placement: Moist heat is conducted through white polyamide fiber cloth (50g/m²)
- Observation conditions: Inspection is required under multi-angle diffuse light (0.25-1m distance)
Grading assessment system
The 2020 version refines the damage level into 5 levels:
| Level | Judgment characteristics |
|---|---|
| Level 1 | No visual changes |
| Level 3 | Visible color change at multiple angles but no structural changes |
| Grade 5 | Material shedding or fiber cloth adhesion |
Implementation suggestions
Troubleshooting
Case 1: When edge effect occurs, ensure that the test area interval is ≥50mm, and use insulating pads to isolate heat conduction
Case 2: For dark paint films, it is recommended to use a 3-person evaluation team and take the closest average grade
Key points for quality control
- Regularly calibrate the thermometer (JB/T9262 requirement)
- Detect the roughness of the heat source block before each batch of tests
- Maintain a constant temperature of 23±2℃ in the test environment
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