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High-low Temperature Test for Retroreflective Film

Place the 150 mm * 150 mm sample into the test box (chamber), activate the cooling source to reduce the temperature in the test box (chamber) to -40°C ± 3°C, and maintain the sample under this temperature for 72 hrs. Turn off the power supply, raise the temperature of the test box (chamber) to the room temperature naturally, and raise the temperature of the test box (chamber) to 70°C ± 3°C after about 12 hrs, as well as maintain this temperature for 24 hrs. Finally, turn off the power supply, cool the test box (chamber) to the room temperature naturally, take out the sample, and place it in the standard test condition for 2 hrs, and then check the change of the sample surface by the 4X magnifier according to the requirement.

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