Corrosion 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.

CORROSION TEST - YOUR ADVANTAGE FOR DURABLE AND CORROSION-RESISTANT VEHICLE COMPONENTS

Corrosion is an electro-chemicalprocess in which metals are attacked by external influences such as moisture, salt and oxygen. This process leads to the formation of rust and other oxide layers, which can significantly weaken the stability and service life of components. Vehicles that are exposed to changing weather conditions and roads on which salt is scattered therefore require effective corrosion protection. To ensure that materials and coatings can withstand these stresses, corrosion testing is a tried and tested method in the automotive industry.

It is crucial for manufacturers to ensure that their products can withstand extreme conditions. Our accredited corrosion tests allow you to check the corrosion resistance of your materials and components. This allows you to ensure that your products meet both market requirements and the high expectations of your customers.

Typical corrosion test procedure

Coordination of the customer specification

Checking the requirements (standards, OEM specifications) and drawing up an individual test plan.

Sample preparation

Preparation and documentation of test samples in accordance with standard specifications.

Test setup and climate conditioning

Positioning the samples and setting the ambient conditions.

Performance of the test

Compliance with and monitoring of the defined test parameters.

Intermediate checks and visual inspection

Documentation of signs of corrosion during the test cycles.

Final test

Evaluation of samples in accordance with standards and test plan.

Report preparation

Preparation of a test report

Application examples

Metallic components and their alloys
Coated materials
Anodic oxide layers
Organic coatings on metallic materials

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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.

FAQ

FREQUENTLY ASKED QUESTIONS ABOUT CORROSION TESTING

What types of corrosion tests are there? There are various types, including:

Neutral salt spray test (NSS test)
Copper accelerated acetic acid salt spray test (CASS test)
Acidic salt spray test (AASS test)

What do NSS, AASS and CASS stand for? DIN EN ISO 9227 describes standardized salt spray tests to evaluate the corrosion resistance of materials and coatings.

NSS (Neutral Salt Spray): Use of a neutral saline solution (pH 6.5-7.2), suitable for general corrosion tests.
AASS (Acetic Acid Salt Spray): Addition of acetic acid to the solution (pH 3.1-3.3), mainly for coated metals.
CASS (Copper Accelerated Acetic Acid Salt Spray): copper-accelerated acetic acid salt spray increases the aggressiveness (pH 3.1-3.3), often for decorative coatings.

Is imat accredited, certified and approved for corrosion testing?

Yes, we carry out tests in accordance with national and international standards and OEM-specific requirements. imat is accredited for the most important tests. Find out more about our accreditations here.

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

Corrosion tests