Doors and windows of the Door Bottom Seal need to have waterproof, sealed and energy-saving important role, it has sound insulation, dust, antifreeze, warm and other functions, but also a strong tensile strength, good flexibility, but also need better temperature and Aging resistance. The current seal market generally have modified PVC, vulcanized EPDM rubber seal and thermoplastic EPDM (EPDM / PP) tape mainly.
Classification and Characteristics of Door and Window Sealant
According to statistics, China's building energy consumption accounts for 27.5% of the total energy consumption of the whole society. Through the closed doors and windows around the gap loss of energy is usually about 37-40% of building energy consumption. Therefore, it is important to improve the sealing performance between the fan frame and the glass, especially between the window frame and the sash.
1. Modified PVC tape
Modified PVC tape: the price is relatively low, due to the quality of different advantages and disadvantages, low-end products due to the use of waste, alternative plasticizers and high filling, resulting in poor elasticity, easy to hard, The move makes the box yellow and has a short service life. As the PVC products contain halogen, stabilizers containing heavy metals, it is not conducive to environmental protection, so foreign developed countries and domestic Beijing and coastal cities have been eliminated or restricted the use of PVC tape.
2. Vulcanized EPDM seal
Vulcanized EPDM Seal: Seal elasticity in the seal than the PVC strip stronger, but because of the need for microwave curing line stereotypes, processing energy consumption is high, usually more than 20 times the PVC processing, the product that can not be used, Not environmentally friendly, not the country advocated by the product. So the basic door enterprises are not used.
3. Thermoplastic EPDM seal
Thermoplastic EPDM Seal This seal is a new material developed in recent years from the introduction of foreign technology and domestic independent research and development, mainly used for automotive doors and windows seal, in recent years for the construction of doors and windows Door Bottom Seal.
Its outstanding advantages are:
① performance and service life and vulcanized EPDM rubber seal quite.
② processing energy consumption relative to the vulcanized EPDM tape is low (quite with PVC).
③ halogen and lead and other heavy metals, plus a number of years after the recovery, in line with green building materials requirements.
④ small proportion (only 0.9-0.95) out of the window rate. Looks like the purchase price is high, the actual use of low cost. This product in recent years in the construction of doors and windows on the use of a very rapid development.
In fact, the actual production process in the doors and windows, the seal of the input accounted for a small proportion, but its role can not be ignored. Such as waterproof, sealed and energy saving, noise, dust, antifreeze, warm, warm, anti-aging, these functions in daily life can not be ignored.
So how to identify it, Xiao Bian finishing the following points:
1. Can be used to smell the smell of the nose, the normal will have a little taste of the son of alcohol, but almost very small smell.
2. Strip the seal as tight as possible on the profile and place it at high temperatures for a period of time (on a roof or sunny place). Look at the surface of the profile and the sealing surface of the contact surface is fouling discoloration, sealing the surface of the dust is yellow (oil is easy to soil) oil, whether dirty hands.
3. Some of the cheaper price of the seal will be a lot of filler, so the surface will not be very bright, those are very cheap appearance is not desirable.
4. Look at the proportion. Add ternary seal, you back and forth by hand several times, the surface will appear a small amount of white powder.