我国塑料管材市场与发达国家相比,突出表现是国外塑料管材产量大,应用面广。如美国1997年为216万吨,欧洲为147万吨,日本为60万吨。我国的塑料异型材及门窗与国外发达国家相比不足的是,市场占有率低、产量小。德国是开发塑料门窗最早的国家,1986年塑料窗市场占有率已达50％。进入20世纪90年后期,欧美发达国家塑料门窗发展迅速,美国塑料市场占有率已达30％以上。 另一方面,我国塑料管材、塑料异型 Compared with developed countries, the outstanding performance of China’s plastic pipe market is that foreign plastic pipe production is large and its application is wide. For example, the United States had 2.16 million tons in 1997, 1.47 million tons in Europe, and 600 tons in Japan. China’s plastic profiles and doors and windows are less than the foreign developed countries, the market share is low, the output is small. Germany was the earliest country to develop plastic doors and windows. In 1986, the market share of plastic windows reached 50%. In the late 1990s, the development of plastic doors and windows in developed countries in Europe and America was rapid, and the market share of the US plastics reached more than 30%. On the other hand, China’s plastic pipe, plastic profiled