Mercedes-Benz MBN 51000-5 Polymer-Based Materials, Material Systems and Semi-Finished Products - Part 5: Weatherability Tests

The standard "Mercedes-Benz MBN 51000-5 Polymer-based materials, material systems and semi-finished products - Part 5: Weatherability tests," published by the Mercedes-Benz Group, describes specific test specifications that are not defined or sufficiently defined in DIN, EN, ISO standards or VDA recommendations. This standard describes the weatherability tests of polymer-based materials, material systems and semi-finished products.

The general requirements in this standard are determined as follows:

• To ensure product safety and quality and to meet certification requirements, all relevant legal regulations and laws must be complied with. The relevant requirements of the Mercedes-Benz Group also apply.
• All materials, process engineering, component parts and systems must comply with all applicable legal requirements regarding components and recyclability.
• Must comply with the standard “DBL 8585 General requirements environmental protection, hazardous substances, negative substance list for hazardous goods material selection”.
• Legal requirements and local standards for emission behavior in the vehicle interior must be complied with.
• Mercedes-Benz Group-specific specifications for emissions from materials and component parts in the vehicle interior must also be met. These are contained in the DBL 1000 standard.
• The requirements to be met by polymer-based materials, material systems, and semi-finished products tested using the described tests must also be documented in company standards. This means that a company standard is only permitted to reference a test in a company standard when the company standard it references contains the test requirements.
• The specifications of the reference company standard must also be followed in the testing of polymer-based materials, material systems and semi-finished products.

The MBN 51000-5 standard is a critical specification in the automotive industry, focusing on weatherability testing of polymer-based materials, material systems, and semi-finished products used in vehicles. This standard ensures that materials such as instrument panels, upholstery, gaskets, and other polymer components withstand prolonged exposure to harsh environmental conditions such as heat, ultraviolet (UV) light, and extreme temperatures. By adhering to this standard, manufacturers and suppliers ensure the durability, performance, and aesthetic quality of vehicle components in harsh climates.

The MBN 51000-5 standard outlines test methods for assessing how polymer-based materials degrade when exposed to environmental factors. Its primary focus is hot light aging testing, which simulates prolonged exposure to heat and UV light. This testing is particularly crucial for both interior and exterior vehicle components exposed to constant sunlight and temperature fluctuations. This standard aims to ensure that these materials maintain their mechanical integrity, appearance, and chemical stability over time, ensuring they meet the stringent quality requirements for vehicle production.

The cornerstone of the MBN 51000-5 standard is the hot light weathering test, which complies with DIN EN ISO 105-B06 (exposure condition No. 3). This test simulates long-term exposure to UV light and high temperatures to assess material degradation. The key evaluation criteria are:

• Appearance: Check for fading, discoloration or loss of shine.
• Mechanical integrity: The ability of materials to not crack or become brittle.
• Chemical stability: Verification that the chemical composition of the material remains intact.

Materials that pass the hot light aging (HLA) test demonstrate durability by retaining their performance and aesthetic properties, while those that fail may exhibit issues such as fading, cracking or brittleness, making them unsuitable for automotive applications.

The MBN 51000-5 standard applies to a wide range of polymer-based components, including:

• Interior components: Instrument panels, upholstery, and trim materials exposed to sunlight through windows.
• External components: Seals, gaskets and external trims that are directly exposed to environmental influences.
• Semi-finished products: Polymer-based materials used in composite structures or as part of larger assemblies.

By ensuring these components meet weatherability requirements, the standard helps maintain vehicle safety, reliability and visual appeal throughout the product lifecycle – critical to customer satisfaction and brand reputation.

The MBN 51000-5 standard is part of a wider package of Mercedes-Benz group standards for polymer-based materials, each of which addresses specific testing aspects:

• The MBN 51000-2 standard focuses on the approval processes of polymer-based materials, material systems and semi-finished products.
• The MBN 51000-3 standard focuses on thermal and climatic behavior.
• The MBN 51000-6 standard covers mechanical tests, including scratch resistance.
• The MBN 51000-7 standard addresses resistance tests such as stress cracking and abrasion.
• The MBN 51000-8 standard describes in detail analytical tests such as differential scanning calorimetry (DSC) for low-temperature behavior.

Together, these standards enable comprehensive evaluation of polymer materials in line with the Mercedes-Benz Group's commitment to quality and performance across all vehicle components.

Testing under the MBN 51000-5 standard is typically conducted by accredited laboratories. These facilities use advanced equipment to simulate real-world conditions and evaluate material performance. The results of hot light aging (HLA) tests focus on ensuring that materials meet the Mercedes-Benz Group's stringent criteria for durability and aesthetics. Non-compliant materials that fail to maintain their properties are rejected, while compliant materials are approved for use in production.

The MBN 51000-5 standard plays a key role in ensuring the longevity and reliability of polymer-based components in Mercedes-Benz vehicles. By simulating harsh environmental conditions, the standard helps manufacturers identify materials that can withstand real-world challenges, reducing warranty claims and increasing customer confidence. Its emphasis on weather resistance aligns with the automotive industry's broader push for sustainable, durable, and high-performance materials.

As a result, the Mercedes-Benz MBN 51000-5 standard is an essential tool for assessing the weatherability of polymer-based materials in automotive applications. Through rigorous testing, particularly hot light aging, it ensures that materials used in vehicles maintain their performance, appearance, and durability under harsh environmental conditions. This standard is a cornerstone for suppliers and manufacturers aiming to meet the high standards of the automotive industry.

Our organization, which has been operating for many years and meticulously follows global developments in science and technology, employs a team of experienced professionals and a broad infrastructure to conduct testing, measurement, and analysis in a wide range of areas for businesses across all sectors. In this context, we also provide testing services in accordance with the "Mercedes-Benz MBN 51000-5 Polymer-based materials, material systems, and semi-finished products - Part 5: Weather resistance tests" standard.