Multi-functional Auto Trim Strips Case Study

Cool, colorful, customized

Auto interiors with a personal touch

A splash of accent color … a customized decorative matte or high-gloss finish … today’s consumers want a car’s interior to reflect their personal style. Cost effectively meeting this demand has been a challenge for automakers. Until now.

Supplier: Gerhardi
Industry: Automotive
Application: Multi-functional auto trim strips
Product: Makrolon® polycarbonate, 
                 Bayblend® (PC+ABS; PC+ASA blend),
                 Makrofol® polycarbonate film

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With inherently flexible thermoplastics such as Makrolon® polycarbonate and Bayblend® resin as well as effects possible with Makrofol® polycarbonate films, automakers can now economically produce vehicle interiors with an amazingly customizable look and feel.

To showcase the possibilities, Covestro developed a multi-functional automotive trim strip that features:

  • Matte and high-gloss structures
  • Attractive colors with gloss effect
  • Outstanding coatability
  • Excellent metallization
  • Scratch resistance
  • Production efficiency with film insert molding

The trim strip component demonstrates how innovative – even complex – design concepts become a simplified reality, thanks to Covestro materials and variable mold technology developed through a collaboration between Gerhardi and Covestro.

With a variety of surfaces and design possibilities for vehicle interiors, Covestro materials can help automakers put customizable auto interior components on the fast track to commercialization.

The main properties of Makrolon® polycarbonate grades are:

  • Good heat resistance
  • Glass-like transparency, optical quality
  • High dimensional accuracy and stability
  • Easy processing
  • Weathering resistance
  • High impact resistance

The main properties of Bayblend® (PC+ABS; PC+ASA blend) resin grades are:

  • High toughness – even at cold temperatures
  • Dimensional stability
  • Excellent creep resistance
  • Low moisture absorption
  • Good heat resistance

The main properties of Makrofol® film grades are:

  • High heat resistance
  • Impressive toughness and elasticity over a wide temperature range
  • Good stiffness
  • Excellent electrical insulation properties
  • Abrasion, weathering and chemical resistance
  • Glass-like transparancy


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