Mercedes-Benz DBL 1302 Interior Trim Materials - Plastic Surface Coverings

The standard "Mercedes-Benz DBL 1302 Interior trim materials - Plastic surface coatings" developed by the Mercedes-Benz Group describes a test method and quality assessment criteria specifically for the coating of interior plastic components in the automotive industry. This standard specifies the specifications for the coating processes of interior plastic components of the Mercedes-Benz Group. This standard replaces the previously valid standard "DBL 7384 Coatings of plastic parts in vehicle interiors".

The DBL 1302 standard is used to ensure quality control of the coating processes of plastic components and contains requirements that ensure the durability and aesthetics of interior components in the automotive industry.

The test method described in this standard applies to a variety of plastic coatings, including paints, prints, and physical vapor deposition processes used on interior plastic parts. Test methods include: test procedures for coating thickness, adhesion, scratch resistance, abrasion, environmental resistance (such as cleaning agents and perspiration), emission levels (VOC/FOG), odor, and aging resistance.

This standard ensures that coatings applied to interior plastic parts meet Mercedes-Benz’s stringent quality standards for durability, safety, and environmental compatibility. It is part of a comprehensive set of specifications that Mercedes-Benz uses to maintain high-quality interior materials in its vehicles.

The Mercedes-Benz DBL 1302 standard focuses on the coating of plastic parts used in vehicle interiors. Its primary purpose is to ensure consistent quality, durability and appearance of coated plastic components inside the vehicle. The main focus areas of this standard are:

• Surface coating requirements:
  • Specifies how plastic parts should be coated (e.g. paints, varnishes, physical vapor deposition).
  • Includes decorative and protective coatings.
• Visual and aesthetic standards:
  • Color consistency
  • Brightness level
  • Surface texture and feel
• Mechanical and physical properties:
  • Adhesion
  • Scratch and abrasion resistance
  • Abrasion resistance over time
• Chemical resistance:
  • Resistance to detergents, cosmetics, sunscreens and sweat.
  • Compatibility with substances commonly encountered in the vehicle environment.
• Aging and environmental resistance:
  • Resistance to UV light, heat and moisture.
  • Long-term durability under real-world use.
• Emissions and odor:
  • Limits for volatile organic compounds (VOC) and fogging values.
  • Fragrance evaluations to ensure a pleasant in-cabin experience.
• Testing and validation:
  • Defines testing procedures and evaluation criteria to ensure compliance.

In short, the DBL 1302 standard is about ensuring that interior plastic parts not only look good, but also perform well over time under a variety of environmental and usage conditions in accordance with the premium standards of the Mercedes-Benz Group.

Plastic surface coatings consist of multiple functional and aesthetic layers applied to plastic components to increase durability, appearance and resistance to environmental and mechanical stresses, particularly in the context of automotive standards such as the Mercedes-Benz DBL 1302 standard.

The main components of plastic surface coatings are:

• Primer layer (optional but common): Applied to improve the adhesion between the plastic substrate and the coating. The materials used are special adhesion promoters or primers adapted to the type of plastic.
• Base coat (colour or decorative layer): Applied to provide the desired colour and usually the initial visual finish (e.g. matte, gloss, metallic). Materials used may include solvent-based or water-based paints, metallic pigments or dyes.
• Top coat/clear coat: Applied to protect the base coat from scratches, UV rays and chemicals and to add shine or texture. The materials used are durable polyurethane or acrylic clear coats, sometimes soft touch or anti-fingerprint coatings.
• Functional coatings (optional, depending on part function): Includes:
  • Anti-scratch coatings
  • Soft touch or rubberized coatings
  • Anti-glare or anti-reflective layers
  • Anti-microbial coatings (for high-touch surfaces)
  • Physical vapor deposition (PVD) (used for metallic coatings with high durability and aesthetic appeal)

Additional features often included in coatings include:

• UV stability
• Chemical resistance (sweat, lotions, cleansers, etc.)
• Thermal stability (resistance to heat and humidity)
• Low emissions (VOC and odor control for indoor air quality)

In general, application techniques include:

• Spray coating
• Dip
• Pad printing
• Laser engraving (for backlit symbols or controls)
• Vacuum metallization or PVD (for chrome-like coatings)

In summary, plastic surface covers are high-performance, visually appealing parts that combine raw plastic with stringent automotive interior requirements such as those specified in the DBL 1302 standard.

Our organization, which has been trying to support businesses from every sector with its testing, measurement, analysis and evaluation studies carried out in a wide range for years, has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. In this context, testing services in accordance with the "Mercedes-Benz DBL 1302 Interior upholstery materials - Plastic surface coatings" standard are also provided to businesses.