Seal features:
1 modified PVC strips
The price is relatively low, due to the merits of varying quality, the price is generally between 6,000 yuan 15,000 yuan / ton. Low-end products due to the use of waste, alternative plasticizers and high filler content, to make the tape, poor flexibility, easy to hard, there assassination nose smell, easy migration to make the frame material yellow, short life. Few low-level price competition in doors and windows still in use. , The high-end PVC strips can meet the standard indicators, life is relatively longer.
Because PVC products containing halogen, stabilizers containing heavy metals, it is not conducive to environmental protection, so foreign countries and domestic Beijing and coastal cities Pat eliminate or limit the use of PVC strips.
2 thermoplastic EPDM rubber seal
The seal was developed in recent years on the basis of the introduction of technology from abroad and domestic independent research and development on a new material, mainly used for automobile doors and windows sealed, in recent years begun for the building doors and windows sealed.
Its outstanding advantages are: ① performance and service life with vulcanized EPDM rubber seal fairly. ② processing vulcanized EPDM seals with respect to energy consumption low (with PVC quite). ③ free of halogens and heavy metals such as lead, plus a few years later recycled, in line with green building requirements. ④ proportion of small (only 0.9-0.95) out the window rate. Purchase price seems high, low real cost.
Features: 1) light weight, high strength stretch, does not absorb water (instead of the traditional three oil four felt, asphalt, cedar wood panels and other materials). Product environmentally friendly, simple construction, seepage, leakage, sealing good effect. 2) corrosion resistance, aging resistance, high temperature + 80 ℃ ~ -45 ℃ not flowing, no distortion, no embrittlement, long service life. 3) an independent opening bubble structure, a special type of joint appearance of honeycomb plate holes evenly distributed, you can not beat wool and cement / adhesive sealant tightly integrated, adapt to the natural expansion and contraction of change, strengthen joints expansion of the seal sealing effect.
3 vulcanized EPDM rubber seal
In terms of the sealing elastic persistent than PVC strips greatly enhanced, but due to the need microwave curing line styling, high processing power consumption, typically more than 20 times the PVC processing, the product can not be reused, not environmental protection, not a national advocacy products. In addition, the proportion of such products material (1.4 and above) quite (low specific gravity greater vulcanized EPDM seals) and PVC class rate and PVC strips out the window almost cost is relatively high, doors and windows are difficult to accept.