plastic structural components suitable for use in automotive applications and exhibiting improved impact strength , energy absorption , and reduced fragmentation upon impact are made from a fiber reinforced thermoplastic resin . the improved properties are achieved by using reinforcing fibers having a weight average length of at least about 4 mm . specific applications include vehicle instrument panel substrates that are used for supporting a foam padding and an aesthetic covering , and concealing an inflatable air bag that deploys into the occupant compartment of the vehicle in the event of a severe collision .