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)
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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.
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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.
