| 摘要 |
<p>Extruded hollow thermoplastic structural components of rectilinear cross section formed for interlocking assembly with mating components for use in erecting a modular building characterized in that said components are extruded from PVC material which includes a smoke retarding agent which is covered by a skin (3) on surfaces exposed to the environment. Preferably the component is an elongated extruded hollow thermoplastic structural component of rectilinear cross section formed for interlocking assembly with mating components for use in erecting a modular building, characterized in that said component is formed as a co-extrusion of a substrate (2) of PVC containing from about 10 % et 35 % by weight of the substrate of a reinforcing and expansion controlling agent and from about 5 % to about 35 % per weight of the substrate (2) of smoke retarding agent, the total of said agents being less than about 45 % by weight of the substrate, and a thermoplastic skin (3) covering surfaces of said component which remain exposed when said component is interlocked with mating components in a building structure, said substrate (2) being substantially thicker than said skin (3), said skin (3) forming a protective barrier to isolate said smoke retarding agent from exposure to the environment exterior of said component when same is incorporated into a building structure.</p> |
