Non-flammable thermal insulating composite substrate for motor vehicles and production method

A method for producing a motor vehicle component, comprising:

• inserting a non-flammable thermal insulating composite substrate for motor vehicles comprising a textile component and a barrier into an injection mold;
• said textile component consisting of a layer of needle-sewn non-woven fabric composed of a percentage of pre-oxidized polyacrylonitrile fiber ranging from 40% to 70% by weight, and of the remaining percentage of polyethylene glycol-terephthalate fiber, said textile component having a weight of between 200 g/m2 and 600 g/m2;
• said barrier being irreversibly fixed to a surface of said textile component through a spreading process;
• said barrier consisting of a thermoplastic resin based on low density polyethylene added with non-halogen flame retardants, said barrier having a weight of between 30 g/m2 and 150 g/m2;
• said composite substrate having the following features:
• thickness of between 2 mm and 5 mm;
• weight of between 300 g/m2 and 700 g/m2;
• odorless;
• no emission of fumes when said textile component is exposed to flame;
• dimensionally stable, with a maximum dimensional variation of 1%;
• non-flammability when said textile component is exposed to flame;
• and
• co-molding the composite substrate with a predetermined plastic polymer, such that said composite substrate adheres to the plastic polymer at an outer surface of said barrier.