| 摘要 |
<p>The cover comprises a tight cotton fabric (pref. treated against decay) covered on its upper side with a plastic layer (pref. polyvinyl chloride), and on its lower side with a bitumen layer. The surface of the plastic layer is pref. profiled with a network a pyramid shaped protrusions, and the consistency of the bitumen in such that it doesn't soften excessively in summer, or crack in winter. The cover is used for ramps, car parks, walkways etc, and in hard-wearing resistant to chemical attack and waterproof.</p> |
