Why should double 85 test be performed on PET protective film?

What exactly is Double 85?

Double 85 test refers to the aging test of the test body in the environment set at the temperature of 85℃ and humidity of 85%, that is, the harsh reliability test. The usual time is 1000 hours, mainly testing the product in the harsh environment of high temperature and humidity can withstand the limit.

Constant temperature and humidity test is used to test the heat resistance, cold resistance, dry resistance and moisture resistance of materials or products in various environments, while double 85 test is aimed at the heat and humidity resistance of products.

Double 85 test refers to comparing the performance changes of products before and after aging, such as photoelectric performance parameters of lamps, mechanical properties of materials, yellows index, etc., after aging products at 85℃/85%RH. The smaller the difference, the better, so as to test the heat and humidity resistance of products.

Reliability “double 85” test is widely used in LED and photovoltaic industry, LED light source, module and accessories need to carry out reliability “double 85” test to reproduce the high temperature and humidity environment damage to its components, and this is also a common use of product life test environmental test conditions.

For welded components, the reliability of the “double 85” test can be tested against the long-term penetration of high temperature moisture. For plastic components, the reliability of the “double 85” test can examine the mechanical properties of the material, yellow resistance, heat resistance, acid, alkali and salt resistance, especially the data comparison before and after the test can show this trend. Reliability of the “double 85” test has penetrated into all walks of life, electronic, electrical, communication technology, instrument, vehicle, medical, plastic products, aerospace and other industries widely used.

For our ordinary glass-bonded PET protective film, the test temperature is generally 60 degrees and the high humidity is 90%, and the test time is about 3 days. For some industries, such as the pet protective film of the car screen, the test time may be 4-5 days. If the PET protective film is exported to foreign countries, it will be required to do a double 85 test. Because most of the products go abroad by sea, which takes a long time on the sea, the test time is required to be 7-10 days.