which may for example comprise trauma lite honeycombs type pei 3 5 70 supplied by trauma lite limited po box 456 manchester m62 ll united kingdom in this material the diameter of the tubes is 3 5 mm and the material density is 70 kilos per cubic metre this material can be thermoformed at temperatures up to 170 u00b0 c the skins 14 and 16 may comprise cetex gi0303 reinforced thermoplastic laminate supplied by ten cate advanced composites campbellweg 30 7443 pv nijverdal netherlands this material is in accordance with boeing aircraft corporation 39 s material specification bms8 353 and can be thermoformed at temperatures in the range 150 u00b0 c to 300 u00b0 c the thermoplastic adhesive may be a polyester based thermoplastic web such as sharnet web sh4275 supplied by bostic findley limited alderscote road leicester le4 68w england this has a fusion temperature of 130 u00b0 c consequently the preferred temperature for bending and shaping composite material made from these materials is 150 u00b0 c when it is desired to bend the material an entire panel is heated for example in an oven heated to a temperature between the fusion temperature of the adhesive and the fusion temperatures of the core and the skins the panel is then bent to form a radius therein the skins move relative to the core so that the skin on the outside of the radius no longer reaches the edge of the core while.