| 摘要 |
<p>The method involves bringing the liquid output components of the polyurethane rigid foam material, consists of a polyisocyanate. The metal bowls are connected with reinforced-plastic rod, and a core of polyurethane rigid foam material. The exterior surface of the composite section is lacquered by a powder lacquering or baking enamel. The polyurethane rigid foam material contains a mineral filler, which is an oxide, sulfate or carbonate of an alkaline earth metal, calcium carbonate and a silicate.</p> |
