What is UV Exposure Testing

Overview of QUV Ultraviolet Aging Testers

The QUV ultraviolet aging tester does not simulate full-spectrum sunlight, but it does simulate the destructive effects of sunlight. This is achieved by controlling the primary radiation of the fluorescent lamps within the ultraviolet wavelength band of the solar spectrum. This method is effective because short-wave ultraviolet light is the most significant factor causing the aging of outdoor materials.

How UV Testing Works

UV testing can reproduce the damage caused by sunlight, rain, and dew. The equipment conducts the test by exposing the materials to alternating cycles of controlled sunlight and moisture while simultaneously elevating the temperature.

The testing equipment utilizes fluorescent ultraviolet lamps to simulate sunlight, and can also simulate the effects of moisture through condensation or spraying. It is used to evaluate material changes in aspects such as color variation, gloss, cracking, blistering, catalysis, and oxidation.

Fluorescent UV Lamp Types

Each lamp type used in UV testing differs in its total ultraviolet emission energy and wavelength spectrum. Fluorescent ultraviolet lamps are generally divided into UVA and UVB lamps, depending on their primary output range:

• UVA-340: Simulates the ultraviolet portion of sunlight, mainly used for photoaging tests of outdoor products.

• UVA-351: Simulates the ultraviolet portion of sunlight passing through window glass, mainly used for photoaging tests of indoor products.

• UVB-313EL: Widely applied in fast and economical testing for durable materials. It accelerates material aging and may sometimes lead to anomalous results. Customer consent must be obtained prior to use.

Testing Details

Applicable Product Range

Mainly used for automobiles, coatings, paints, printing and packaging, pigments, textiles, roofing materials, rubber, plastics, surface finishes, etc.

Test Standards

• ISO 4892.3-2006

• GB/T 16422.3-1997

• ASTM G 154-2006

• ASTM D 4674-2002

Result Evaluation

Appearance Inspection (visual check, color difference, grayscale, etc.).