In the standard “FCA LP-463LB-11-01 Leather (physical testing) - Resistance of general upholstery materials to cold cracking” developed by Fiat Chrysler Automobiles (FCA), an Italian-American automotive company, it is stated that various trim materials subject to cracking at low temperatures are cold cracked. Test methods used to determine crack resistance are explained. These test methods are applied on various coating materials.
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Three test methods are defined in this standard:
For Method A, the test specimen should be 51 mm x 153 mm, with the longer dimension in the warp direction. For Method B, the test specimen should be made of a single piece of material or an assembled part and be at least 153 mm long. If an assembly is being tested for Method C, the test specimen should be either the complete assembly or a 153 mm x 153 mm section of the assembly in the area to be tested. For door trim or seat back materials not tested in an assembly, the material should be placed on a 153 mm x 153 mm x 5 mm filler piece and a 153 mm x 153 mm x 8 mm piece of chipboard.
Unless otherwise specified in the applicable material standard, conditioning should be 79 days at 16 degrees plus/minus 7 degrees in an air circulating oven.
In Method A, the sample and canvas gloves are placed in a cold room set to the specified temperature for a minimum of 6 hours. Gloves should be at the same temperature as the test sample. While wearing chilled canvas gloves, the sample is bent 180 degrees (while still in the cold room) and the folded edge is broken with the fingers. This process must be performed within a period of 3 seconds. Gloves act as an insulator between the sample and the hands. The sample is then examined. If the samples crack, break or shatter, the test is deemed unsuccessful.
In Method B, the test specimen, mandrel, and gloves are placed in a cold chamber at the specified temperature for a minimum of 6 hours. The mandrel and gloves must be at the same temperature as the test specimen. While wearing chilled canvas gloves, the test specimen is twisted 180 degrees around the test mandrel while still in the cold chamber. This action should be performed within 3 seconds. The gloves act as an insulator between the hands and the specimen. The specimen is then examined. If the specimen cracks, breaks, or disintegrates, the test is deemed failed.
In Method C, the sample and, if necessary, support material are placed flat on the floor of the cold room for at least 6 hours. The sample must lie flat, otherwise inaccurate results may be obtained. Approximately 450 grams of steel sphere is dropped onto the sample from a height of 30 cm. The ball should be dropped on all areas of the sample that represent a different material or condition. The sample is then examined. If the samples crack, break or shatter, the test is deemed unsuccessful.
The results of each method applied are recorded and the test sample is presented with the report.
Our organization, with its trained and expert staff and advanced technological equipment, among the numerous testing, measurement, analysis and evaluation studies it carries out for businesses in various sectors, "FCA LP-463LB-11-01 Leather (physical test) - Protection of general flooring materials against cold cracking" It also provides testing services defined in the "resistance" standard.
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