ISO 11341 Paints and Varnishes - Exposure to Artificial Weathering - Exposure to Filtered Xenon Arc Radiation

Material Testing

ISO 11341 Paints and Varnishes - Exposure to Artificial Weathering - Exposure to Filtered Xenon Arc Radiation

EUROLAB laboratory provides testing and compliance services within the scope of ISO 11341 standard. The ISO 11341 standard, developed by the International Standards Organization (ISO), specifies a procedure for the exposure of paint coatings to artificial weathering in a xenon arc lamp apparatus, including the action of liquid water and water vapor.

ISO 11341 Paints and Varnishes - Exposure to Artificial Weathering - Exposure to Filtered Xenon Arc Radiation

The effects of this degradation are assessed by comparative determination of individually selected parameters before, during and after decomposition. The standard describes the most important parameters and specifies the conditions to be used in the exposure apparatus.

Coatings of paints, varnishes and similar materials (hereinafter simply referred to as coatings) are exposed to artificial weathering or artificial radiation to simulate aging processes that occur during natural wear in the laboratory or during exposure tests under glass cover.

Unlike natural weathering, artificial weathering contains a limited number of variables that can be more easily controlled and intensified to produce accelerated aging.

Aging processes occurring during artificial and natural degradation cannot be expected to be interrelated due to the large number of factors influencing these processes. Exact relationships can only be expected if the important parameters (distribution of irradiance over the photochemically relevant part of the spectrum, temperature of the sample, wetting and wetting cycle, and relative humidity) are the same in all cases or if their effects are the same. coatings are known.

Artificial etching of coatings or exposing coatings to filtered xenon-arc radiation is performed to obtain a selected degree of change in a property after the radiant exposure required to produce a given degree of radiant exposure H or. aging. The features selected for monitoring should preferably be those that are important to the practical use of overlays. The properties of the exposed coatings are compared with the properties of coatings prepared in the same way (control samples) or simultaneously exposed from the same coating materials, with the properties of coatings whose behavior changes during testing in the exposure apparatus.

During natural weathering, solar radiation is considered the main cause of aging of coatings. The same applies to radiation exposure under glass. Therefore, in cases of artificial weathering and artificial radiation exposure, special attention is paid to the simulation of this parameter.

Therefore, the xenon arc radiation source used is combined with one of two different filter systems designed to change the spectral distribution of the generated radiation to match the spectral distribution in the ultraviolet and visible regions.
equipped. matches the spectral distribution of global solar radiation (method 1) and, with the other filter, global solar radiation filtered by 3 mm thick window glass in the ultraviolet and visible regions (method 2).

Two spectral energy distributions are used to define the irradiance values ​​and allowable deviations of the filtered test radiation in the ultraviolet range below 400 nm. In addition, for the specification of radiation in the range up to 800 nm, CIE Publication No. 85 is used because only in this range xenon-arc radiation is irradiated by the sun.
adaptable to adapt well enough to its radiation.

During testing in the exposure apparatus, the spectral irradiance E may change due to aging of the xenon arc lamp and optical filter system. This occurs especially in the ultraviolet region, which is photochemically important for polymeric materials. Therefore, measurements are made not only of the exposure time, but also of the radiant exposure H in the wavelength range below 400 nm or at a certain wavelength, for example 340 nm, and are used as reference values ​​for the aging of coatings.

It is impossible to accurately simulate every aspect of the effect of weather on coatings. During natural weathering, solar radiation is considered the main cause of aging of coatings. Therefore, in this International Standard, the term artificial decay is used differently from natural decay. Testing using simulated solar radiation filtered by window glass is referred to in this International Standard as exposure to artificial radiation.

Among the services provided by our organization within the framework of material testing services, there are also ISO 11341 standard tests. Do not hesitate to contact our laboratory EUROLAB for your testing and certification requests.

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