Fogging Properties of GMW 3235 Flooring Materials

In the GMW 3235 standard developed by the General Motors company, test methods are explained in order to determine the fogging (fogging) tendencies of all interior and ventilation system materials of the vehicles. These test methods can also be used for other applications, such as the fogging properties of foam or sealants used with automotive lenses.

The GMW 3235 standard defines two alternative test methods with different methods for assessing the degree of fogging:

• Photometric method (method A). In this method, the volatility of organic components is evaluated by making gloss meter measurements (coding A). In this method, the reflectometric values ​​of the volatile components condensed from the sample are measured on a glass plate at 60 degrees.
• Gravimetric method (method B). In this method, the mass of mist condensation on the aluminum foil in mg is determined by weighing the foil before and after the fogging test (coding B). In this method, the concentrated volatile components are determined gravimetrically.

For different beaker volumes used by different test units, a scaling factor is used to ensure results are comparable between test units. Scaling factors based on the manufacturers of the equipment used in the tests are included in the annex to this standard.

Another standard for determining the fogging properties of upholstery materials is the following standard published by the German Institute for Standardization (DIN): DIN 75201 Determination of fogging properties of upholstery materials in automobile interiors. The test method described in this standard is intended to determine the fogging properties of materials used in the passenger compartment of motor vehicles.

Fogging is the condensation of volatile components that evaporate from the interior of cars on automobile windows, especially windshields. This test method is designed to determine the fogging properties of materials used in the passenger compartment of automobiles. This test is also used for liquid, paste, powder and solid raw materials from which materials are produced.

In the latest update of this standard, the cleaning method of glass sheets has been revised and changes have been made to borosilicate glass sheets.

The test procedure results described in the GMW 3235 standard provide supplementary information for the GMW 15634 standard.

Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides test services to determine the fogging properties of vehicle upholstery materials, within the scope of the GMW 3235 standard, with its trained and expert staff and advanced technological equipment.