This part of GB/T 16422 specifies methods for exposing specimens to fluorescent UV radiation, heat and water in apparatus designed to reproduce the weathering effects that occur when materials are exposed in actual end-use environments to daylight, or to daylight through window glass.
This part is applicable to the evaluation of weather resistance of plastics and the comparison test of weather resistance between plastics under the condition of fluorescent UV lamp light source exposure.
The specimens are exposed to fluorescent UV lamps under controlled environmental conditions (temperature, humidity and/or water). Different types of fluorescent UV lamp may be used to meet all the requirements for testing different materials.
Specimen preparation and evaluation of the results are covered in other national standards for specific materials.
General guidance is given in GB/T 16422.1.
Note: Fluorescent UV lamp exposures for paints, varnishes and other coatings are described in GB/T 23987.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4582 Plastics — Determination of Changes in Color and Variations in Properties after Exposure to Daylight under Glass, Natural Weathering or Laboratory Light Sources
ISO 4892-1 Plastics — Methods of Exposure to Laboratory Light Sources — Part 1: General Guidance
3 Principle
3.1 Fluorescent UV lamps, when properly maintained, can be used to simulate the spectral irradiance of daylight in the ultraviolet (UV) region of the spectrum.
