The dashboard panel is commonly made of modified polypropylene (semi-rigid injection molding), PVC (vacuum formed semi-rigid or enamel soft material), polyurethane (enamel or spray coating), etc. Luxury cars also use materials such as synthetic leather.
The interior panels of the doors are mostly made of modified polypropylene, and PVC/ABS sheets are also used for vacuum forming, enamel molding, artificial leather or natural leather sewing, followed by low-pressure foaming inside.
The ceiling material is usually made of polyolefin or PVC/ABS sheet vacuum formed flocking; The information for the safety airbag cover is usually polyester elastomer, but there are also polyolefin thermoplastic elastomers available;
Knobs, buttons, etc. are mostly made of modified polypropylene PC,PC/ABS, Nylon and other materials are injection molded, and some have secondary injection molding with soft material coating.
Automotive interior accessories, air filters, safety airbags, battery barriers - all use non-woven TPE products that will burst along the centerline or circumference of the airbag during blasting, without any powder flying out, making them ideal materials for manufacturing safety airbags. Ordinary American cars use 55D TPE, while German cars still use 45D non-woven fabric for safety airbags.
The seat surface is made of fabrics, synthetic leather, etc.
In short, automotive interior materials are not a specific type of material, but a collection of all materials that can be used for automotive interior applications.