Since the 1960s, when hollow glass production began in China, the industry has gone through several stages of development, including single-layer sealed glass, simple double-glazed units, manually sealed single-channel systems, and later, the more advanced double-channel sealing method. Recently, composite rubber-type insulating glass has emerged as a modern solution. After nearly four decades of growth, the market has matured significantly. With increasing emphasis on building energy efficiency in China, the quality of insulating glass has become a critical concern.
The main factors that influence the performance and durability of insulating glass are the selection of raw materials and the production processes. This article focuses primarily on the importance of choosing high-quality raw materials, as they directly impact the performance and lifespan of the final product.
Currently, three main types of insulating glass are used in China: slot aluminum single-channel sealed, slot aluminum double-channel sealed, and composite sealing strip type. The single-channel system is gradually being phased out due to its poor sealing properties, which lead to moisture infiltration, condensation, and reduced service life. The other two types use similar raw materials, such as glass, aluminum strips, gussets, butyl rubber, two-component polysulfide or silicone sealants, desiccants, and composite sealing strips.
When selecting glass for insulating units, it's essential to use high-quality materials like colorless float glass, coated glass, tempered glass, or laminated glass. Ordinary flat glass should be avoided because it lacks the necessary transparency and strength. Different batches from various manufacturers should also be checked for color consistency before cutting. Any significant color difference should be considered when assigning the glass to different projects or areas of a building.
Glass cutting must follow precise specifications, and the surface should be free of defects such as scratches or bubbles. For aluminum strips and gussets, the thickness should be between 0.3–0.35 mm, with uniform distribution of vent holes. These components must undergo anodizing or cleaning treatments and should be of high quality to ensure long-term performance.
Desiccants play a vital role in maintaining dryness within the insulating unit. Common types include those with high volatility absorption, low inert gas adsorption, and standard molecular sieves. Choosing the right molecular sieve depends on the adhesive used, and it should have appropriate particle size (1–1.5 mm) and hardness. Desiccants must be stored and used under dry conditions, and their packaging should be opened within 1.5 hours to maintain effectiveness.
Sealants are another key component. Butyl rubber is commonly used as the first layer, offering excellent moisture resistance. It requires specialized equipment for application and must be heated and pressurized. Polysulfide rubber is widely used due to its good oil and solvent resistance, while silicone sealant offers UV resistance but has higher water vapor permeability, making it suitable for exterior applications where structural adhesives are needed.
Composite sealing strips, developed in the 1980s by American chemists, combine a support structure, sealant, and desiccant into one unit. They offer ease of use, reduced material waste, and lower labor costs. However, they require special equipment and have slower moisture absorption rates. When selecting these strips, attention should be given to surface smoothness, aluminum strip quality, glue content, and viscosity.
Hebei Xingda Insulating Glass Aluminum Strip Factory
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Contact: Business Manager
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Hebei Qianmu Fastener Manufacturing Co., Ltd , https://www.qmjgjfasteners.com