PSA D45 1139 Filling Materials - Dimensional Changes and Direction Changes with Heat

The purpose of the test method described in the standard "PSA D45 1139 Filling materials - Dimensional changes and direction changes with heat" developed by the Peugeot automobile company is to test the flooring materials (plastic coated textiles, leathers, plastic sheets, fabrics, knits, non-woven fabrics, ceiling) exposed to heat effect. tiles and similar) as well as changes in their appearance.

When performing the test, in principle, test pieces of the materials to be examined are placed in a ventilated oven and changes in appearance and dimensions are noted. The temperature and duration of the test are determined by the reference documents.

The equipment used in these tests includes:

• Oven: It is a forced ventilation device that makes it possible to achieve good temperature uniformity throughout the usable space and maintain the selected temperature throughout the test period. The oven must include a regulating device to ensure that the temperature does not vary by more than plus/minus 2 degrees around the selected value during the test and by more than plus/minus 1 degree from one end of the test tube to the other. The internal dimensions of the oven must be such that the test sample must in no case come into contact with the walls or floor of the oven and does not disrupt air circulation.
• Grill: A grill is placed halfway into the oven to prevent the test pieces from coming into contact with the oven floor. In the case of materials that are highly deformable when heated, a perforated metal sheet is used as a support.
• Thermometers: These are thermocouples that are calibrated, rated to 0,5 degrees, or connected to a temperature reading device.
• Reglet: Graduated to the nearest 0,5 mm.
• Material: Visible marks must be drawn on the sample to be examined.
• Conditioned room: Must have a temperature of 23 degrees plus/minus 2 degrees and a relative humidity of 50 percent plus/minus 5 percent.
• Example cutting equipment: These are tools such as non-notch scissors or cookie cutters.
• Light booth: Visual color assessment must be made in accordance with the “PSA D15 1343 Colored materials - Visual comparison of colors in the light room” standard.

Test samples should be representative of the quantity to be characterized. To ensure this, it is necessary to know the basic characteristics of the population under study. Sample selection criteria should be stated in the test report, the content of which is defined in the PSA A10 0156 standard.

If materials are delivered in rolls, three square test pieces are taken, if possible, using cutting equipment, parallel to the longitudinal direction of the material, with sides of 300 mm or any other size specified in the reference documents. These samples must be taken from a distance of more than 150 mm from the edges and ends. For textiles, three test pieces should be cut according to the scheme given in the standard, parallel to the warp thread for woven fabrics and parallel to the column (straight grain, straight column) for knitted fabrics.

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