pvc sealing strip supply _ sea Widex (certified) _pvc seal provided by Qingdao Widex Rubber Material Co., Ltd. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is specialized in "PVC profiles, seals, ABS extruded profiles, PVC raw material" of the enterprise, the company adhering to the "honesty, hard service" concept, for You provide the highest quality products and services. Welcome to inquire! Contact: Zhao Shuang. There are more than the number of production companies (nearly 400), yields a miscarriage can be large (2.8 million tons), small demand (2003 sales of 1.2 million tons the country profiles), production can not take full advantage of the current situation within the industry PVC profile industry conflicts over 20,000 tons annual output of less than 10 enterprises, product quality is uneven, inferior products still have a market, industry quality technical standards too low, is not conducive to technological progress pvc seals, leading to substitute aluminum comeback. The high-end market (30%) were occupied by foreign brands, middle and low market unprofitable, intense competition, the final structure has not yet formed. From the factory distribution, at 392 profiles manufacturers in the southeast region of 37%, 12%, Shandong, central region 17% pvc seal manufacturers, the Northeast 19%, 15% in the western region. From the production point of view 2003 National Division capacity 2.8 million tons, Shandong Province 9% pvc sealing strip supply, the central region of 1%, the Northeast 32 percent, 7 percent in the western region, the southeast region of 39%. PVC heat stability and lightfastness is poor. At 140 ℃ decomposition of hydrogen chloride at the beginning, with the number of plasticizer content of the occurrence of adverse reactions. In addition, the impact of PVC of a pigment, the pigment is reflected in the reaction of the pigment itself and the migration resistance, and heat resistance, the occurrence of PVC and other components in the composition of PVC products. Therefore, the colored PVC, considering the resin used and the characteristics of the relevant additives pvc seal processing, combining the characteristics of the pigment. When selecting a colorant should be noted that the following questions. Stability of the coloring agent may induce the degradation of some of the ingredients of the resin. Such as iron ions and zinc ions are PVC resin catalyst degradation reactions. Therefore, iron oxide (red, yellow, brown and black), or zinc oxide pigment, zinc sulfide, and lithopone, white pigments can reduce the thermal stability of the PVC resin. Some colorants may effect the occurrence of degradation products of PVC resin. Based pigments such as ultramarine poor acid resistance, so in PVC coloring process, will be produced by the decomposition of hydrogen chloride and PVC lose their color and interact.