Artificial Light Accelerated Aging Test Machine for Light Test of Automotive Sealing Strips

Passenger vehicle sealing strips are prone to aging due to exposure to various factors in the natural environment, including sunlight (ultraviolet radiation), high heat (exceeding 80℃ in summer), oxygen, ozone, and humidity. Therefore, in practical applications and performance requirements, sealing strips demand high levels of weather resistance and resistance to light aging. Below, we use an accelerated aging test chamber to conduct relevant aging tests on automotive sealing strips. The main test contents are as follows:

Aging Test Study of Automotive Sealing Strips:

Test Equipment: Huanyi Instruments Accelerated Aging Test Chamber

Test Standard: SAE J252

Test Samples:

A sealing strip for the top of a passenger car's glass guide channel. Five different formulations were selected for study.

Sample A: A sample with a fixed formulation from a supplier;

Sample B: A sample with an increased flash point of paraffin oil based on the formulation of Sample A;

Sample C: A sample with increased peroxide content based on the formulation of Sample B;

Sample D: A sample with reduced vulcanization maturity based on the formulation of Sample B;

Sample E: A sample with increased vulcanization maturity based on the formulation of Sample B.

Test Conditions:

Test data collected included color difference ΔE (instrument-collected data) and lightfastness (visual evaluation data). These two sets of data can more comprehensively reflect the state of the samples during the test. In addition, according to the GMW l4169—2010 enterprise standard, the data collection periods are 221, 442, 663, 1240, 2000 kJ/m² and 2500 kJ/m².

The standard requirements for evaluating test specimens are: ΔE ≤ 3, lightfastness ≥ 4; maximum irradiation energy 2500 kJ/m².

Test Results and Analysis:

Comparison of ΔE test results for 5 types of specimens:

Comparison of lightfastness test results for 5 samples:

At an irradiation energy of 221 kJ/m², the ΔE value of sample A reached as high as 7.49. With increasing xenon lamp irradiation time, ΔE gradually decreased, and the lightfastness grade gradually declined. When the irradiation energy increased to 2500 kJ/m², the appearance of the finished sealing strip changed from very glossy to dull and lackluster.