DBL 5310 Supply Specification for Leather Used in Vehicle Interior Trim

The “DBL 5310 Supply Specification for Leather Used in Vehicle Interiors” standard, developed by Daimler, the owner of the Mercedes-Benz brand, describes the requirements, quality criteria, and test methods for leather materials used in the interiors of passenger vehicles, such as seats, steering wheels, gear knobs, door panels, instrument panels, and other leather-covered components.

This standard ensures that leather supplied to Mercedes-Benz meets stringent performance, durability, appearance, and safety criteria for automotive use. It covers both genuine leather and specific leather-like or treated materials designed for interior applications. Tier 1 and Tier 2 suppliers must comply with the DBL 5310 standard to obtain approval for use in the relevant vehicles.

The main areas subject to regulation are as follows:

• Physical and mechanical properties (tensile strength, tear resistance, seam tear strength, adhesion/peel resistance)
• Environmental resistance (heat aging, cold elasticity, light fastness/UV resistance, abrasion color fastness, perspiration resistance - both alkaline and acidic sweat)
• Chemical resistance (to cleaners, oils, cosmetics)
• Misting and emission behavior (low volatile organic compounds for indoor air quality)
• Flammability (cross-references to other DBL standards such as DBL 5307)
• Special requirements for sun-reflecting or premium leather types (e.g., color stability under intense light and heat exposure)
• Surface properties (wear and scratch resistance, soiling/cleanability, grip/feel)

In general, this standard includes the following test sections:

• § 4.x: Color fastness and abrasion (e.g., dry and wet abrasion tests according to VDA or ISO methods).

This section mainly includes: paint system structure, layer thickness requirements, surface preparation requirements, substrate compatibility, color and appearance definition, volatile organic compound (VOC) or chemical content restrictions, and REACH compliance.

• § 7.x: Heat resistance (exposure to heat and cold).

For example, the DBL 5310 § 7.27 standard mostly deals with one of the following types of tests: chemical resistance, resistance to cleaning agents, cream/sunscreen/cosmetic resistance, interior trim surface resistance to soiling, and post-scratch appearance stability. In the Mercedes DBL structure, clauses 7.x generally involve durability tests.

• § 8.x: Sweat resistance (acid and alkali artificial sweat tests).

For example, the DBL 5310 § 8.5 standard generally deals with the following topics: visual evaluation criteria, color and gloss tolerances, surface defect limits, film thickness tolerance, and post-test acceptance/rejection criteria.

• § 9.x: Resistance to light and xenon arc and weathering (for fading and deterioration).
• § 23.x or similar: Special tests for leather versions that reflect sunlight.

This section generally covers the following topics: long-term aging conditions, specific customer tests, climate cycle tests, emission requirements, and part-specific approval criteria.

• Others include: adhesion, tear strength, and folding durability.

Many tests refer to international standards (ISO, DIN, EN) or VDA methods adapted to Mercedes' stricter limits.

Compliance with DBL 5310 is mandatory for suppliers of leather for Mercedes-Benz Group vehicles. Failure to comply with the standards may lead to batch rejection, production delays, or disqualification as a supplier.

This standard reflects Mercedes-Benz's commitment to long-term durability, a premium feel, and passenger comfort/safety in leather-upholstered interiors.

The DBL 5310 standard specifies technical requirements for interior decorative and functional surface materials, commonly used in the following areas:

• instrument panels
• Door trims
• Center consoles
• Pole coverings
• Interior linings

The primary purpose of the DBL 5310 standard is to ensure the following:

• Long-lasting durability
• Resistance to environmental aging
• Stability of surface appearance
• Compliance with internal emission limits.

The scope of application of this standard is as follows:

• Plastic-based internal components
• Foil-coated or laminated decorative surfaces
• Coated internal components
• Surface-treated thermoplastics

It is generally referenced together with other Mercedes-Benz material standards such as DBL 5306 or emission-related DBL specifications.

The DBL 5310 standard includes test and performance criteria in the following areas:

• mechanical performance
• Scratch resistance
• Wear resistance
• Surface hardness
• Adhesion of decorative layers
• Climate and aging resistance
• Heat aging (exposure to high temperatures)
• Cold resistance
• moisture resistance
• Thermal cycling tests
• Chemical resistance
• suntan cream
• hand creams
• Cleaning agents
• Sweat simulation fluids
• Light and UV stability
• Xenon arc weather resistance tests
• Color stability assessment
• Shine protection

DBL 5310 may refer to Mercedes-Benz internal test procedures and international standards such as the following:

• ISO wear tests
• VDA scratch tests
• Xenon weather resistance procedures

All tests are rigorously monitored. Controlled laboratory conditions are provided to simulate long-term vehicle use.

Materials conforming to the DBL 5310 standard must provide the following:

• It must pass laboratory validation.
• It must pass an appearance assessment.
• It must meet chemical and emission limits.
• It must be approved by Mercedes-Benz materials engineering.

Once approved, suppliers can deliver the parts with official Mercedes-Benz release status.

The DBL 5310 standard emphasizes the importance of interior components for the following reasons:

• Constant exposure to sunlight
• Frequently touched by users
• Exposure to temperature changes
• Failure to comply with DBL 5310 may result in the following:
• Surface cracking
• Peeling or detachment
• Color fading
• Customer dissatisfaction

Within the Mercedes-Benz system, DBL standards ensure uniformity in global material quality among suppliers.

In conclusion, the DBL 5310 standard is a critical Mercedes-Benz material standard that regulates interior surface durability, appearance stability, and chemical resistance. It ensures that vehicle interior components maintain high aesthetic and functional performance throughout the vehicle's lifecycle.

For many years, our organization, with its competent and experienced team, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the DBL 5310 standard.