| 摘要 |
<p>A sandwich material is characterized in that it comprises at least three layers, viz a first layer (12), constituting a wear layer, consisting of a polymeric substance with a hardness of between 85 DEG and 100 DEG Shore A, a second layer (9) consisting of rubber with a hardness of between 50 DEG and 70 DEG Shore A, but softer than said first layer, and a third layer (10) consisting of rubber with a hardness of between 20 DEG and 50 DEG Shore A, but softer than said second layer, said second layer being located between said first and third layers.</p> |
