Many people may have had these experiences: Even though the windows are closed, rain still seeps into the home and the whistle of cars on the road downstairs can be heard clearly at home. These are likely to be the failure of the door and window sealant!
Although silicone sealant is only an auxiliary material in the manufacturing process of windows, accounting for a small proportion of the cost, it plays a very important role in the performance of windows, especially in watertightness, airtightness, thermal insulation, sound insulation, etc. It should not be underestimated. If the silicone sealant has quality problems, it will cause problems such as water leakage and air leakage, which will seriously affect the air tightness and water tightness of doors and windows.
So what kind of silicone do you use for windows?
1. Correctly select products that meet the standards
In the selection process of silicone sealant, in addition to the standards it meets, attention should also be paid to its corresponding displacement level. Displacement capacity is the most critical indicator to measure the elasticity of the sealant. The higher the displacement capacity, the better the elasticity of the sealant. For the processing and installation of windows, products with a displacement capacity of not less than 12.5 should be selected to ensure the long-term air-tightness and water-tightness of windows.
During the installation and use of windows, the bonding effect between ordinary sealants and cement concrete is usually worse than that with aluminum profiles or glass of doors and windows. Therefore, it is more appropriate to use the sealant used for window installation in China to comply with JC/T 881.
Products with high displacement levels are more capable of withstanding changes in joint displacement. It is recommended to choose products with high displacement levels as much as possible.
2. Correctly select sealant products according to the application
Hidden frame windows and hidden frame opening fans require structural sealant to play a structural bonding role. Silicone structural sealant must be used, and its bonding width and thickness must meet the design requirements.
In the process of door and window installation, the sealant used for stone joints or joints with stone on one side should be a special sealant for stone that meets the GB/T 23261 standard.
For fireproof doors and windows or building exterior doors and windows that require fireproof integrity, it is more appropriate to use fireproof sealants.
For application places with special requirements for mildew resistance, such as kitchens, bathrooms and dark and humid places, mildew-proof sealants should be used for the sealing of doors and windows.
3. Do not choose oil-filled silicone sealants!
At present, there are a lot of oil-filled door and window sealants on the market. These products are filled with a large amount of mineral oil and have poor aging resistance, which will lead to many quality problems.
Silicone sealants infused with mineral oil are known in the industry as “oil-extended silicone sealants”. Mineral oil is a saturated alkane petroleum distillate. Because its molecular structure is very different from that of silicone, it has poor compatibility with the silicone sealant system, and will migrate and penetrate from the silicone sealant after a period of time. Therefore, the “oil-filled sealant” has good elasticity at the beginning, but after a period of use, the filled mineral oil migrates and penetrates from the sealant, and the sealant shrinks, hardens, cracks, and there is even a problem of non-bonding.
I hope Siway’s introduction can bring you some help!
Post time: Aug-17-2022