FIELD: construction.
SUBSTANCE: application of fibre-reinforced plastic with elasticity module >8000 N/mm2, preferably >10000 N/mm2, point of softening >100°C, preferably >150°C, and expansion ratio <6 10-5 K-1, preferably <5 10-5 K-1, especially preferably <4 10-5 K-1, in particular, application of fibre-reinforced polybutylene terephthalate, polyethylene terephthalate or their mixtures, for a reinforcing plank of a hollow profile for a window frame or a door case.
EFFECT: invention makes it possible to increase profile strength.
3 cl, 5 dwg
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