| 摘要 |
Polyolefin multilayer pipes consisting at least one of the layers of a beta-nucleated propylene homopolymer and/or beta-nucleated copolymers from 90.0 to 99.9% by weight of propylene and 0.1 to 10.0% by weight of alpha-olefins. The pipes are to be classified in ring stiffness class >=4. The pipes are suitable for non pressure pipe applications, preferably for outdoor use, for above as well as underground drainage and sewerage pipe systems, surface water pipes, pipes for cable protection, pipes for cold climate conditions and for indoor use, soil and waste water pipes.
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