| 摘要 |
The material is an extruded high impact, exterior PVC material comprising no more than 80 percent by weight of PVC resin and about 7 percent by weight of filler, said material being permanently bendabl e and has an average coefficient of thermal expansion of about 2.7 x 10 in/in degree Fahrenheit over the range of ambient temperatures from minus 4 to plus 86 degrees Fahrenheit. A unique method of making the material extrudes it at lower temperatures than usually utilized. The material, formed in a strip is cooled to limited te mperatures immediately before it is coiled. |
