| 摘要 |
A prefabricated building element, preferably a window sill or cill, lintel or quoin, comprising an outer shell 12 having at least an upper surface 16, a lower surface 18, a front surface 20, a rear surface 22 and first and second end surfaces (24, 26 Fig 1), the shell is made from a composite of a plastics resin mixed with either crushed marble or crushed glass and the shell is filled with an expanded plastics foam. Preferably the resin is a polyester resin, more preferably an isophthalic neopentyl unsaturated polyester resin that uses a methyl ethyl ketone peroxide catalyst to help it set. The foam may be a liquid polyisocyanate mixed with a polyol. The foam may be sprayed into the shell during manufacture through one or two apertures located in the shell. There may be a reinforcement 44 made of steel, carbon fibre or engineered plastics. The marble or glass gives a more aesthetic quality whilst the insulating expanded foam makes the element lighter in weight. |
