JG/T 255-2020 in English
VALIDSealed insulating glass unit with shading inside
- Issued on:2020-01-13
- Implemented on:2020-08-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | JG/T 255-2020 |
| Document status: | VALID |
| Title in English: | Sealed insulating glass unit with shading inside |
| Title in Chinese: | 内置遮阳中空玻璃制品 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-01-13 |
| Implemented on: | 2020-08-01 |
| Superseding: |
JG/T 255-2009 Sealed insulating glass unit with shading inside
|
| ICS Classification: | 81.040-Glass |
| Professional Classification: | JG-Building |
| Related Keywords: | glass unit
glass fiber fire-resistant glass passive energy-saving applications key performance inside introduction analysis |
| Related Topics: | jg/t 440
Glass product insulating glass Glass product built-in jg/t 455 glass position |
本标准规定了内置遮阳中空玻璃制品的术语和定义、分类和标记、材料、配件和构造、要求、试验方法、检验规则、标志、标签和随行文件、包装、运输和贮存。
本标准适用于门窗、幕墙、采光顶、隔断等建筑用内置遮阳中空玻璃制品。
Introduction
Analysis of the core content of the standard
| Technical dimension | Requirements of the 2009 version | New regulations of the 2020 version | Technological evolution |
|---|---|---|---|
| Structural classification | 4 basic types | Added combined curtains (ZH) for a total of 5 categories | Adapt to the needs of complex building forms |
| Operation mode | Manual/electric | Added fixed type (GD) | Expanded passive energy-saving applications |
| Key performance | Shading coefficient (SC) | Changed to solar heat gain coefficient (SHGC) | Aligned with international standard ISO 19467 |
Material and key construction technologies
Frame materials:Newly added insulation and non-insulation types, with wall thickness requirements increased to aluminum alloy≥0.8mm, glass fiber reinforced plastic≥1.0mm.
Sunshade:Clearly specify that the surface solar reflectance is ＞0.4, metal blinds must comply with JG/T 251, and fabrics have added appearance requirements such as anti-stripping and stripe alignment.
Performance requirements breakthrough
- Fire integrity: The outdoor side must use fire-resistant glass (GB 15763.1)
- Durability: The accelerated durability test is refined into water vapor/gas sealing durability (see Table 3 for the number of cycles)
- Optical performance: The lighting performance index is changed to visible light transmittance (measured according to GB/T 2680)
Implementation suggestions
1. Equalizing pipes (inner diameter ≤0.51mm, length ≥300mm) should be configured in areas with altitude difference＞1000m
2. Electric products need to consider JG/T simultaneously 278 electrical safety requirements
3. Typical configuration heat transfer coefficient range 1.07-3.26W/(m²·K), the design should be combined with the data in Appendix B
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