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Vehicle interior-car-interior

Fogging

Determination of the fogging behavior of materials used in vehicle interiors

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 a haze or fogging 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.
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HAPTICS & COMFORT RATING

Subjective and objective assessment of haptics and comfort

HARMONY FOR SENSES AND COMFORT

The demands placed on modern vehicles have long since gone beyond technology and functionality. One decisive aspect that has a major impact on customer satisfaction is the feeling that a vehicle conveys - both in terms of touch and comfort during use. Customers expect a sophisticated interplay of aesthetics, haptics and comfort, especially in the interior of a vehicle. These aspects are becoming increasingly important not only for premium manufacturers, but also in the broad market segment.

Haptics and comfort evaluation has established itself as a central discipline in order to meet the growing expectations of customers. It combines subjective impressions with objective test criteria to make the quality of materials, textiles and surfaces in vehicles measurable. The aim is to create an interior experience that is visually, tactilely and functionally convincing - be it for the seats, armrests or other surfaces that are regularly touched in the vehicle.

With a clearly structured approach and state-of-the-art testing methods, we help manufacturers and suppliers make informed decisions. Our tests provide crucial insights into how materials are perceived and experienced, setting standards in an industry where quality and innovation go hand in hand.

 

  • Visual inspection
  • Tactile tests
  • Comfort analyses
  • Long-term usage tests

Visual inspection

First impressions are important. The appearance of the materials is examined for color, pattern and workmanship.

Tactile tests

Specific tests are carried out to assess the softness, elasticity and general feel of the textiles. This is often done using standardized handling tests in which experts assess the materials for their feel.

Comfort analyses

These include evaluating the heat and moisture regulation of the textiles. Materials that maintain a comfortable temperature and wick away moisture contribute significantly to comfort while riding.

Long-term usage tests

We also carry out tests under realistic conditions to evaluate the durability and behavior of the materials over time.

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We rely on comprehensive evaluation methods for textile testing:

  • Visual inspection

  • Tactile tests

  • Comfort analyses

  • Long-term use tests

Fogging test methods

  • DIN 75201-A (reflectrometric)
  • DIN 75201-B (gravimetric)
  • PV 3015 (Volkswagen)
  • GMW 3235-A (General Motors Worldwide)
  • PSA D45 1727
  • and much more.
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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.
Do you have further questions?

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FAQ

FREQUENTLY ASKED QUESTIONS ABOUT HAPTICS AND COMFORT RATINGS

Why are haptics and comfort evaluated? In the automotive sector, both haptics and comfort are crucial for customer satisfaction. Customers expect a pleasant experience that is not only aesthetically pleasing, but also offers a pleasant feel and a high level of comfort, especially on longer journeys.
What test methods are available?
  • Visual inspection
  • Tactile tests
  • Comfort analyses
  • Long-term use tests
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.