Huanren Lab

 Project Introduction

Ultraviolet aging test is also called UV aging test. Ultraviolet aging does not simulate full spectrum sunlight, but it simulates the destructive effect of sunlight. This is achieved by controlling the main radiation of the fluorescent lamp tube in the ultraviolet band of the solar spectrum.

The experimental equipment uses fluorescent ultraviolet lamps as the light source to simulate sunlight ultraviolet rays, and can also simulate the effects of dew and rainwater through condensation or spraying. The sample is tested for dozens of hours or even days in a solar UV environment simulated by a laboratory UV aging test chamber, which can simulate damage that may occur in the outdoors for months or years, and the damage results that take months or years to occur in the outdoors. After ultraviolet aging, the reproduction product includes fading, discoloration, brightness decrease, powdering, cracking, blurring, embrittlement, strength decrease and oxidation.

Purpose of the experiment

The reliable data provided by UV ultraviolet aging test can accurately predict the weather resistance (anti-aging) of the product, and help screen and optimize materials and formulas.

Application scope

It is mainly suitable for automobiles, motorcycles, building materials, textiles, furniture and leather industries.

The difference between ultraviolet aging test and xenon lamp aging test

Unlike the xenon lamp aging/solar radiation aging test, UV ultraviolet aging cannot simulate full-spectrum sunlight, and the wavelength in the electromagnetic spectrum of ultraviolet light is from 0.01 to 0.10 microns radiation. Most polymers, such as plastics, and rubbers are affected to a large extent by ultraviolet aging. Long bands including some colors and UV rays of fuel materials can also cause severe aging.

UV aging test stage

UV aging test can set three aging modes: light, condensation and spraying.

Lighting stage

Simulate the daytime light length (usually between 0.35W/m2 and 1.35W/m2 in natural environments, and the sun's illumination intensity at noon in summer is about 0.55W/m2) and the test temperature (50℃~85℃) to simulate the various usage environments of the product and meet the testing requirements of different regions and industries.

Condensation stage

Simulate the phenomenon of fogging on the surface of the sample at night. Turn off the fluorescent ultraviolet lamp (dark state) during the condensation stage, only the test temperature (40~60℃) is controlled, and the sample surface humidity is 95~100%RH.

Spraying stage

The raining process is simulated by continuously spraying water on the surface of the sample. Because artificial UV accelerated aging test conditions are much more harsh than natural environments, aging damage that can only occur in a few days or weeks can be simulated and reproduced in a natural environment for several years.

Commonly used UV aging tubes

UVA-340: The main purpose is to simulate the medium and short wavelength range in the ultraviolet part of sunlight, and is generally used for photoaging tests of outdoor products.

UVA-351: The main purpose is to simulate the medium-to-short wavelength range in the ultraviolet part of the sunlight filtered by window glass, and is generally used in indoor products.

UVB-313: They emit quite a lot of radiation below 300nm, and 300nm is the cut-off wavelength of nominal solar radiation. This will cause some aging that will not occur outdoors. This type of light is not recommended to simulate sunlight. This kind of test is mainly widely used in the durability test of accelerated materials, as a qualitative comparison of two or more materials