Service life tests

FOGGING TEST IN THE
AUTOMOBILE INTERIOR

The fogging test is an essential test for materials used in vehicle interiors. It ensures that your components do not release unwanted volatile substances that could deposit on windows or other surfaces. The fogging test is an essential test for determining the outgassing of volatile organic compounds (VOCs) from materials in the vehicle interior. It ensures that emissions, which can appear as fog or mist on cold surfaces such as windscreens, are minimized to ensure driver visibility and safety. These deposits can not only impair visibility, but also reduce the perceived quality and comfort in the vehicle.

SIGNIFICANCE OF THE ELECTRICAL LOAD IN THE UTILIZATION PHASE

Vehicles are exposed to extreme conditions during the use phase. Temperature fluctuations, vibrations, humidity and electromagnetic interference affect the performance and longevity of individual components. Precise simulation of these loads makes it possible to identify potential failures at an early stage and increase product reliability.

The simulation of electrical stress over the life cycle of vehicle components is crucial for OEMs and suppliers to ensure the reliability and safety of their products. As a testing service provider, we offer specialized solutions to address the challenges and requirements in the critical use phase of individual components.

Ambient conditions

Various standards, such as VW 80000 or LV124,specify which climatic conditions must be taken into account during the tests. This includes extreme temperatures and high humidity, which affect the electrical properties of the components.

Vibrations and mechanical loads

The tests requiredby thestandards help to evaluate the effects of vibrations on the components caused by engine operation and road conditions. These mechanical loads can result in material fatigue and failures.

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TECHNOLOGIES AND METHODS FOR SIMULATION

In order to realistically simulate the electrical loads and meet the corresponding requirements, we rely on state-of-the-art technologies and test methods :

Multiphysics simulation: this technology enables the simultaneous consideration of electrical, thermal and mechanical phenomena. This is crucial in order to understand the complex interactions and meet the standard requirements.
Service life modeling: By using service life models, we can predict the expected service life of components under realistic operating conditions, which also takes into account the requirements of the standard.
Cyclic load tests: These tests simulate the repeated loads that components experience in vehicle operation and are important for identifying potential weak points in the design at an early stage.

The implementation of electrical load simulations offers numerous advantages:

Early identification of weak points: Simulation allows potential problems to be identified early before they occur in real-world use. This helps to avoid costly recalls and repairs.

Optimization of product reliability: The analysis of simulation results enables targeted adjustments that increase the service life and performance of the products.

Compliance with standards: Our tests ensure conformity with current standards, guaranteeing product quality and safety.

Cost efficiency: By reducing the need for extensive physical testing, development costs can be lowered while product quality is improved.

FAQ

Frequently asked questions about the fogging test

What is the fogging test? The fogging test measures the release of volatile substances from materials that can form deposits on surfaces such as windows.

How long does a fogging test take? As a rule, you will receive the results within a few days, depending on the complexity of the materials.

What do I do if the exam is negative? We offer you comprehensive advice and recommendations to take appropriate measures and find alternative materials.

What sample quantities are required for a fogging test?

The sample quantities required for a fogging test depend on the standard and the test method used. Here are the general guidelines:

1. standard DIN 75201 (type A and type B)

Type A (glass plate method):
A sample quantity of 10 cm² is typically required. The sample is placed on a heated plate in a sealed chamber and the volatiles released condense on a glass plate above.
Type B (aluminum foil method):
Similar to type A, a sample volume of approximately 10 cm² is used. However, the volatile substances condense on a cooled aluminum foil.

2. standard ISO 6452 (international standard)

Sample quantity:
Again, a sample size of about 10 cm² is typically required to evaluate the amount of volatiles released at elevated temperature.

3. other specific requirements

Depending on the specific requirements of the customer or OEM standards, sample quantities may vary. It is important to check the respective standards or test requirements carefully.

What is the difference between the reflectometric and gravimetric test method according to DIN 75201?

Method A - Reflectometric method:

Principle: This method measures the change in reflectivity on a glass plate on which volatile components from the material sample are deposited.
Procedure: A material sample is heated in a beaker while a glass plate above it is cooled to 21°C. The temperature difference causes the volatile components to condense on the glass plate. The reflectance index of the fogged glass plate is then measured to determine the amount of condensed material.
Application: This method is particularly suitable for materials for which an exact determination of the optical fog effect is required.

Method B - Gravimetric method:

Principle: This method measures the weight of condensed volatiles on an aluminum foil.
Procedure: The material sample is heated in a beaker while an aluminum foil disc is cooled to 21°C. After 16 hours, the amount of condensed material on the foil is weighed.
Application: This method is ideal for an accurate quantitative determination of the amount of condensed volatiles.

FAQ

FREQUENTLY ASKED QUESTIONS ABOUT SERVICE LIFE TESTING

What is the service life test? The service life test is a simulation of the electrical load over the life cycle of vehicle components in order to test the reliability and safety of the various components.

What are the advantages of simulation?

Early identification of weak points

Optimization of product reliability

Compliance with standards

Cost efficiency

Do you have any further questions? Our experts will be happy to answer your questions about various laboratory tests. Please feel free to contact us here. We look forward to processing your inquiry and helping you further.

Fogging

FOGGING TEST IN THE
AUTOMOBILE INTERIOR

Typical test methods

SERVICE LIFE TESTS