High temperature vulcanized silicone rubber has excellent properties, mainly:

1. Excellent cold resistance and heat resistance

Silicone rubber can be used for a long time in the environment of -70 ℃ ~ 200 ℃. The good high and low temperature performance of silicone rubber is especially important in China with a large latitude range. On the windows and walls of sunny summer in southern China, the temperature is 70 ℃ It is normal, and it is not surprising that the climate in the northern region in winter is -40 ℃. The huge temperature difference severely restricts the use of PVC, thermoplastic elastomers and EPDM rubber. General plastics, rubbers or elastomers are brittle at -20°C, and cannot be constructed even at 0°C. And silicone rubber at -70 ℃ ~ 200 ℃, there is no big change in physical properties.

2. Excellent weathering resistance

Whether it is plastic or EPDM organic rubber, its material is basically composed of carbon-oxygen chain and carbon-carbon chain. The C-O and C-C bond energies of these materials (336 KJ/mol and 356 KJ/mol, respectively) are lower than the UV irradiation energy (370 KJ/mol). Chain scission is also prone to occur in heat aging environments, leading to degradation of the material. The performance is that the sealant strip is not resistant to UV aging and thermal aging. The main chain of silicone rubber is basically a silicon-oxygen bond structure, and the Si-O-Si bond energy (452KJ/mol) is higher than the ultraviolet radiation energy, so silicone rubber has excellent weathering resistance. Under the action of sun, rain, water and ozone, the performance will not decrease significantly after 30 years of aging outside, which can be synchronized with the service life of doors and windows, which cannot be achieved by other materials.

3. Good elasticity and resilience

Building doors and windows are always subject to mechanical changes from the outside world and themselves, such as thermal expansion and contraction, instantaneous load, wind load, earthquake effect, long-term load: self-weight, temperature difference deformation, snow load, etc. Silicone rubber has excellent elasticity and good compression deformation, which is incomparable with other rubbers and plastics. Silicone rubber can be arbitrarily adjusted between Shore 30A-85A to achieve the best sealing performance.

4. Safety and environmental protection

In 1954, silicone rubber was confirmed in human experiments: "non-toxic, odorless, non-adhesive to human tissue and blood, good biological adaptability, and extremely sensitive to the outside world. Abnormal." The announcement of the results also shows that as an elastomer material in the environmental protection and medical fields, only silicone rubber is the safest. In the US FDA (US Food and Drug Administration) certification, none of the new environmentally friendly materials is more harmless to the human body than silicone rubber. It is undoubtedly of special significance to highlight its excellent environmental protection performance in buildings.

5. Good air permeability and selective air permeability

The latest research shows that the oxygen transmission rate of silicone rubber is 25 times that of natural rubber and 428.6 times that of butyl rubber (IIR).

6. Smooth surface and various colors

It has good surface performance, and the color can be made into color, which can be matched with door and window profiles of any color, and has a good decorative effect. Excellent surface properties, anti-stick, hydrophobic.