Stone impact 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.

Accredited corrosion tests

STONE IMPACT TESTS: RESILIENCE AND PROTECTION FOR LONG-LASTING COATINGS

Stone impact tests are an important method for evaluating the resistance of paintwork, particularly in the automotive sector, where surfaces are exposed to daily stresses caused by stones and dirt particles being thrown up. These tests simulate realistic scenarios in which mechanical influences are specifically simulated in order to test the resilience of painted vehicle parts such as bumpers or floor panels. The aim is to identify weak points at an early stage and to sustainably improve the quality of the coatings so that they remain durable and functional even under demanding conditions.

In accordance with DIN EN ISO 20567-1, standardized hard cast granules are shot at the test specimens at a defined pressure and angle in order to simulate the real stress caused by road dirt. The pressure of the shot is variable, as the speed of the granulate cannot be set directly in km/h. The test system is regularly calibrated and the granulate is routinely replaced to ensure reproducible results. Parameters such as grain size, bombardment quantity, angle and pressure are adapted to the respective standard and manufacturer specifications.

Once the tests have been completed, the extent of the damage is visually assessed and documented, taking into account the affected layers. For meaningful results, it is essential that the samples are delivered in a clean and undamaged condition. Shock-resistant packaging protects the samples during transportation, and accompanying documents with details of the coating and layer information facilitate test preparation.

The test parameters include the pressure, the grain size of the granulate, the bombardment angle and the number of samples. At least five samples are required per test series, with additional samples recommended for comparison tests. Shipment is made to our test center in shockproof packaging, accompanied by coating and material composition information to ensure comprehensive and accurate analysis. Our professional stone impact tests provide you with reliable results and increase confidence in the quality of your coatings.

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Purpose of the stone impact tests

Assessment of resistance: Checking how paintwork withstands mechanical influences such as stones thrown up and road dirt.
Detection of weak points: Identification of coating defects to improve quality at an early stage.
Simulation of realistic conditions: Simulation of everyday loads in accordance with DIN EN ISO 20567-1 for realistic results.
Quality assurance: Ensuring the durability and protective function of vehicle paintwork.
Compliance with standards and specifications: Testing of paintwork based on manufacturer-specific requirements and international standards.

Test execution

The stone impact tests are carried out in accordance with the DIN EN ISO 20567-1 standard in order to simulate realistic stresses caused by stones and road dirt being thrown up. Standardized chilled cast iron granulate is shot at the samples to be tested at a defined pressure and angle. The test system makes it possible to vary the pressure and therefore the speed of the granulate, as the firing speed cannot be set directly in km/h. This ensures precise adjustment of the test parameters. This ensures precise adjustment of the test parameters to real load situations.

In order to achieve reproducible results, the test system is regularly calibrated and the granulate is routinely replaced. Depending on standard or manufacturer specifications, parameters such as grain size, bombardment quantity, angle and pressure can be flexibly adjusted.

Once the tests have been completed, the extent of the damage is visually assessed. The affected layers are documented and the results analyzed in accordance with the normative specifications. To ensure reliable performance, it is important that the samples are delivered in a clean and undamaged condition. They are transported in shockproof packaging, accompanied by accompanying documents with details of the coating and layer information. This ensures that all relevant details are included in the test parameters and that a precise analysis is possible.

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 STONE IMPACT TESTS

What are stone impact tests and why are they important? Stone impact tests simulate mechanical loads caused by stones or road dirt in order to test the resistance of paintwork. They are important for detecting weak points at an early stage and ensuring the protective function and durability of the coating.

How are stone impact tests carried out? In accordance with the DIN EN ISO 20567-1 standard, standardized chilled cast iron granulate is fired at the samples to be tested at a defined pressure and angle. The parameters such as pressure, grain size and angle of impact are adapted to specific requirements. This is followed by a visual damage assessment and documentation.

What requirements must the samples for stone impact tests fulfill?

The samples should be delivered clean, free from damage and contamination. Shockproof packaging protects them from damage during transportation. Information on the type of coating, coating system and coating process is necessary in order to optimally determine the test parameters.

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

Stone impact tests

STONE IMPACT TESTS: RESILIENCE AND PROTECTION FOR LONG-LASTING COATINGS

Stone impact test methods

Fogging test methods

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