DBL 5575 Textile Flocked Elastomer Parts for Vehicle Body Gaskets and Interior Plastic Parts

The “DBL 5575 Textile-flocked elastomer parts for vehicle body seals and interior plastic parts” standard, developed by Daimler, the owner of the Mercedes-Benz brand, applies to elastomer-based parts that are flocked (typically coated with nylon or similar textile fibers) to reduce friction and noise (e.g., squeaking or rattling) in vehicle interiors and to improve sealing performance or tactile feel. Typical applications include:

• Airtight strips and door and window seals (frame sealing areas).
• Interior trim components such as seals on instrument panels, consoles, or other plastic parts where low-friction or soft-touch surfaces are required.
• Parts inside the cabin or in the housing seals that require resistance to wear, environmental effects, and contact wear.

This standard specifies the material composition, flock adhesion, durability, and performance under automotive conditions (temperature, humidity, chemicals, mechanical stress).

The main test sections are as follows:

• DBL 5575 § 6.5.1 Abrasion resistance (crockmeter method): This test evaluates the surface abrasion of flocked coatings. This section is one of several abrasion-related tests and appears to be applicable as a general or basic abrasion control for flocked surfaces in the main body requirements of the standard.

The Crockmeter abrasion test evaluates the durability and abrasion resistance of textile flock coatings on elastomer substrates. It simulates friction and abrasion that occurs during vehicle use (e.g., opening and closing doors, opening and closing windows, or contact with interior upholstery). Key considerations include:

• Preventing fiber loss (shedding/pilling).
• Low friction, noise reduction, and preservation of aesthetic features.
• Preventing excessive fiber transfer or visible abrasion that could affect sealing performance or indoor quality.
• Poor results can lead to squeaking/rattling issues, shortened seal life, or customer complaints about visible wear.
• DBL 5575 § 10.1 Abrasion resistance test (crockmeter method) - Specific for flock types AA 10 / 20 / 21: Provides variant-specific criteria or procedural adjustments suitable for the specified type of seals (e.g. potentially different cycle numbers, pressures, evaluation thresholds or preconditioning to reflect their typical use in shell seals or less demanding internal applications).

This crockmeter-based abrasion test evaluates fiber retention and surface integrity under simulated friction/wear (e.g., repeated door/window movements or indoor contact). It checks for:

• Minimal fiber shedding or clumping.
• No excessive material transfer to mating surfaces.
• Maintaining low friction, preventing squeaking, and preserving aesthetic features throughout the vehicle's lifespan.

Risks of failure include noise issues, seal failure, or visible wear and tear.

• DBL 5575 § 10.2 Abrasion resistance test (crockmeter method) - Specific for AA 22 flock type: This is specifically designed for AA 22 type seals and is positioned as a higher quality seal (e.g. for critical housing seals or internal areas subject to high abrasion). It is likely to incorporate more stringent criteria such as more friction cycles, higher pressure, or tighter acceptance thresholds to verify superior seal retention and surface integrity.

This test evaluates the flock coating's ability to withstand repeated mechanical friction and wear by simulating real-world stresses:

• Repeated window/door applications with flocked seals.
• Contact wear in vehicle interiors.
• Prolonged exposure can lead to potential squeaking, noise, or visual impairment.

It focuses on minimizing flock fiber loss, clumping, shedding, or transfer while maintaining anti-friction, noise reduction, and sealing functions.

• Other common tests include flock adhesion (tensile or abrasive tests), aging resistance, emission behavior (fogging/odor for interiors), and compatibility with adjacent materials.

These tests ensure that flocked surfaces maintain their integrity throughout the vehicle's lifespan, resisting pilling, fading, or peeling.

Companies supplying gaskets, seals, and interior components to Mercedes-Benz are required to comply with the DBL 5575 standard for part approval. This standard is often cross-referenced with the following standards:

• DBL 5571 (EPDM profiles and molded parts for body areas).
• DBL 5578 (elastomer parts with low-friction coating).
• General indoor material regulations (e.g., DBL 5306 or DBL 1231 standards for emissions).

Non-compliance can lead to rejection in the production part approval process or quality inspections. For those conducting material qualification assessments, supplier compatibility, or testing for Mercedes-Benz parts, this standard ensures the use of reliable, low-noise, and durable velvet elastomer components in vehicles.

In short, the DBL 5575 standard defines the requirements and test methods for textile-flocked elastomer parts used in housing seals and some internal plastic components. This standard specifies the requirements and test methods for textile-flocked elastomer components used in the following areas:

• Body seals (e.g., door, trunk or hood seals)
• Internal plastic interfaces where textile flocking improves function or appearance.

Textile-flocking refers to the permanent bonding (flocking) of a layer of textile fibers to an elastomer (rubber) substrate to improve tactile feel, acoustic properties, sealing performance, or aesthetic appearance.

In summary, the DBL 5575 standard is a supply specification standard that defines the material properties and test requirements for textile velvet elastomer parts used in body seals and internal components, commonly used in automotive engineering. It is part of a broader suite of DBL automotive standards that guide manufacturing quality, durability, and performance.

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 5575 standard.