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Insulating glass composite strip formula
Insulating glass is made up of two or more layers of flat glass, bonded and sealed together using high-strength, air-tight composite adhesives, along with sealing strips and glass spacers. The space between the glass panes is filled with dry gas, while a desiccant is placed inside the frame to maintain the dryness of the air in between. A wide range of original glass types can be selected based on specific needs, such as clear float glass, patterned glass, heat-absorbing glass, heat-reflective glass, wired glass, and tempered glass. The frame can be made from aluminum frames or glass strips, and the entire structure is assembled through bonding, welding, or other suitable methods.
The structure typically resembles a double-layer hollow glass profile. Insulating glass can be manufactured in various thicknesses, including 3, 4, 5, 6, 8, 10, and 12 mm for the original glass sheets, with air gaps available at 6, 9, and 12 mm.
(1) Technical Requirements for Green Clean Insulating Glass under GB11944-89:
a. Materials: Glass options include flat glass, laminated glass, patterned glass, heat-absorbing glass, coated heat-reflective glass, and tempered glass. Float glass must meet the standards of first-class or premium products per GB11614. Laminated glass should comply with GB9962, and tempered glass must meet GB9963.
b. Sealants: The color difference between the primary and secondary sealant components must be clearly visible. The shelf life should exceed six months. For hidden-frame curtain walls, the secondary sealant must be silicone-based, meeting all performance requirements of insulating glass.
c. Spacer Box: Aluminum spacers must be anodized and cleaned before use.
d. Desiccant: Must meet quality, size, and performance standards required for insulating glass production.
2. Dimensional Tolerances:
Length/Width Tolerance (mm):
- 1000–2000: ±2.5
- >2000–2500: ±3
3. Thickness Tolerance:
Glass Thickness (mm) | Allowable Deviation (mm)
≤6 | 18–25: ±1.5
>6 | >25: ±2
Note: Nominal thickness is the sum of the two glass panes and the spacer.
4. Diagonal Tolerance:
Diagonal Length (mm) | Tolerance (mm)
≥1000–2500: 6
5. Sealant Width:
Single-seal layer width should be calculated, with a minimum of 10±2 mm. Double-sealed outer sealant width must also be calculated, with a minimum of 5–7 mm.
6. Appearance: The inner surface should be free of smudges or adhesive splatter that could impair visibility.
7. Performance Requirements: Sealing, dew point, UV resistance, climate cycle, and high temperature/humidity tests are conducted according to GB7020. The seal pressure should be below ambient by 10±0.5 kPa, with a thickness increase of at least 0.8 mm. After maintaining pressure for 2.5 hours, the dew point must not exceed -40°C. No condensation or frost should appear after 3 minutes of testing. UV exposure for 168 hours should not result in fogging or contamination. Climate and humidity cycles must pass 320 and 224 cycles, respectively, followed by a dew point test. At least 11 out of 12 samples must remain free of condensation or frost. For hidden-frame curtain walls, the second sealant must be silicone-compatible with structural glass assembly sealants. When using silicone for structural assembly, it is recommended to use the same type for the insulating glass sealant.
(2) Performance of Green Clean Insulating Glass:
With a thermal conductivity 27 times higher than air, properly sealed insulating glass offers optimal insulation. Its optical properties are detailed in Table 4-33, while the comparison of double-layer insulating glass is shown in Table 4-34. Thermal insulation properties are outlined in Table 4-35, and noise levels for different environments are listed in Table 4-36. Sound insulation performance is described in Table 4-37.
(3) Characteristics of Green Clean Insulating Glass:
Insulating glass contains an air cavity between the glass panes, providing excellent thermal and sound insulation. By filling this cavity with diffused light or dielectric materials, additional benefits like sound control, light management, and enhanced insulation can be achieved.
(4) Applications of Green Clean Insulating Glass:
This type of glass is commonly used in buildings requiring heating, cooling, noise reduction, or condensation prevention. It is ideal for spaces where direct sunlight or special lighting conditions are needed. It is widely used in residential, commercial, and institutional buildings, including homes, hotels, offices, schools, and hospitals. Additionally, it can be applied in train, car, and ship windows, as well as freezer cabinets and other similar applications.
Primarily used for exterior glass design, its optical, thermal, and acoustic properties must meet national standards.