ASTM G151 Standard Practice for Revealing Non-Metallic Materials in Accelerated Testing Equipment Using Laboratory Light Sources

EUROLAB laboratory provides testing and compliance services within the scope of ASTM G151 standard. The ASTM G151 standard covers general procedures to be used when exposing non-metallic materials in accelerated test equipment using laboratory light sources. Detailed information on the procedures to be used for specific devices is found in the standards describing the specific device used.

Carbon arc, xenon arc and fluorescent UV exposures are also described in Applications G23, G26 and G53, which refer to very specific equipment designs. G152, G153, and G154 and G155 Implementations are performance-based standards that replace G23, G26, and G53 Implementations.

This application also describes general performance requirements for devices used to expose non-metallic materials to laboratory light sources. This information is primarily intended for manufacturers of laboratory accelerated exposure devices.

This application provides information on the use and interpretation of data from accelerated exposure tests. Specific information about methods for determining the property of a non-metallic material before and after exposure is found in the standards describing the method used to measure each property. Information on reporting results from exposure tests of plastic materials is described in Application D5870.

When performing exposures on devices using laboratory light sources, it is important to consider how well the accelerated test conditions will reproduce the property changes and failure modes associated with end-use environments for the materials under test. In addition, it is important to consider the effects of variability in both accelerated testing and outdoor exposures when setting up exposure experiments and interpreting results from accelerated exposure tests.

No laboratory exposure test can be specified as an exact simulation of actual use conditions in outdoor environments. Results from these laboratory accelerated exposures can only be considered representative of actual in-use exposures when degree correlation is established for the specific materials tested and the degradation type is the same. Due to differences in UV radiation, wet time, relative humidity, temperature, pollutants and other factors, the relative durability of materials under actual use conditions can be very different in different locations. Therefore, even if the results from a particular exposure test conducted according to this application are found to be useful for comparing the relative durability of materials exposed in a particular outdoor environment,

Although very tempting, it is not recommended to calculate an acceleration factor for xh or megajoules of radiant exposure up to y months or years of external exposure in a laboratory time-lapse test. These acceleration factors are not valid for various reasons.

The acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material. Variability in deterioration rate, both in actual use and in laboratory accelerated exposure testing, can have a significant impact on the calculated acceleration factor.

Acceleration factors calculated based on the radiation ratio between a laboratory light source and solar radiation do not take into account differences in radiation, temperature, humidity, and spectral power distribution over a material, even if the same bandpasses are used. laboratory light source and solar radiation.

Our organization, EUROLAB, provides standard application services for the release of non-metallic materials in accelerated test devices using laboratory light sources, within the framework of national and international standards, with its trained and expert staff and advanced technological equipment, among numerous test, measurement, analysis and evaluation studies. Provides testing services within the scope of ASTM G151 standard.