Doors and Windows a performance system of perfect organic combination, to consider water tightness, air tightness and wind resistance, mechanical strength, heat insulation, sound insulation, anti-theft, sunshade, weatherability, handle and a series of important function, through the profiles, glass, glass glue, sealing gaskets and auxiliary parts through standardized production, processing and installation, form a system of high performance Windows and doors. Building energy consumption has accounted for 40% of China's total social energy consumption; The energy consumption of doors and Windows accounts for 45% ~ 50% of the energy consumption of buildings, 15% ~ 20% of the total energy consumption of society. Therefore, energy saving is an important requirement of system doors and Windows, and the sealing of doors and Windows is the key point of energy saving. High performance sealing strip is an essential part of high performance system doors and Windows, the quality of sealing strip will directly affect the sealing effect of doors and Windows. If the sealing strip quality problems, may lead to the following problems:

(1) If the sealing strip is poor in aging resistance and high and low temperature resistance, it will become hard and brittle after installation and use, and the loss of elasticity will lead to the loss of sealing performance;

(2) If the selection of sealing strip resistance deformation, in the long-term compression deformation will be difficult to recover, can not maintain good sealing, serious even after the installation part shrinkage resulting in falling off phenomenon;

(3) Due to the addition of small molecular plasticizer in part of the sealing strip, after long-term sunlight heating, the sealing strip appears sticky, even oil infiltration phenomenon, pollution of glass and profiles, affecting the appearance of doors and Windows and sealing performance.

At present, the sealing strip commonly used in building doors and Windows mainly includes EPDM, PVC, silicone rubber (SR) sealing strip and other types, among which PVC is gradually eliminated by the market due to poor aging resistance. Epdm performance is relatively better than PVC, is a more used sealing strip. Silicone rubber has excellent aging resistance, high and low temperature resistance, high resilience and other excellent performance, is the best sealing strip varieties, but because of the price and market awareness and other reasons have not been better promotion.

Excellent weather resistance Excellent weather resistance can make the sealing strip in the long time of light to maintain the performance of the basic unchanged. The main chain of common sealing strip is composed of C-C bond (bond energy 356KJ/mol) or C-O bond (bond energy 336KJ/mol). Under the irradiation of ultraviolet light (irradiation energy 370KJ/mol), chain breakage and rearrangement are easy to occur, leading to degradation, hardening or cracking of the material. The main chain of silicone rubber is Si-O bond (bond energy 452KJ/mol), which is much higher than the ultraviolet radiation energy, and can keep the performance stable under long-term light aging.

Excellent high and low temperature resistance China has a vast land and a large latitude span. The difference in climate will lead to the temperature change of the doors and Windows of the outer wall from 70℃ to -40℃ from the summer of the south to the winter of the north. This also allows the system doors and Windows to seal a wider range of temperature requirements. Silicone rubber can be used for a long time between -60℃ and 200℃, which can meet the use of doors and Windows in all seasons throughout the country.

Excellent elasticity and resilience elasticity is the shape variable of rubber deformation, resilience is the sealing strip from external force and its own force deformation has the performance of returning to the original shape and size, the better the resilience, can better ensure the sealing strip and profile or glass close to each other. Therefore, excellent elasticity and resilience is an important performance of sealing strip to ensure the air tightness of doors and Windows. The rotational energy of Si-O bond in silicone rubber is low, and the siloxane chain is helical chain structure, so silicone rubber has good elasticity

Color diversity, non-toxic odorless general epDM rubber can only be made into black products, and there is an unpleasant smell. Silicone rubber sealing strip can be adjusted into a variety of colors, and can be matched with any color of door and window profiles, providing good sealing and good appearance, and safe, non-toxic and tasteless, in line with the system doors and Windows is the artistic effect of architectural modeling.

Density and meter weight is small because of the different raw material sources, the unit price of silicone rubber sealing strip is higher than epDM sealing strip, but it is often easy to be ignored that the density of silicone rubber is smaller than EPDM sealing strip, and the silicone rubber sealing strip has a longer length and a higher window rate under the same weight.