ISO 16474-2-2013 pdf free.Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: Xenon-arc lamps.
This part of Iso 16474 specifies methods for exposing specimens to xenon-arc light in the presence of moisture to reproduce the weathering effects that occur when materials are exposed in actual end-use environments to daylight or to daylight filtered through window glass.
The specimens are exposed to filtered xenon-arc light under controlled conditions (temperature, humidity and/or wetting). Various types of xenon-arc lamps and various filter combinations may be used to meet all the requirements for testing different materials.
Specimen preparation and evaluation of the results are covered in other International Standards for specific materials.
General guidance is given in ISO 16474-1.
NOTE Xenon-arc exposures for plastics are described in ISO 4892.2.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 4618, Paints and varnishes — Terms and definitions
ISO 9370, Plastics — instrumental determination of radiant exposure in weathering tests — General guidance and basic test method
ISO 16474-1, Paints and varnishes — Methods of exposure to laboratory lightsources — Part 1: Generalguidance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
4 Principle
4.1 A xenon arc, fitted with suitable fllters and properly maintained, is used to simulate the spectral power distribution of daylight in the ultraviolet (UV) and visible regions of the spectrum.
4.2 Specimens are exposed to various levels of irradiance (radiant exposure), heat, relative humidity and water (see 4A) under controlled environmental conditions.
4.3 The exposure conditions may be varied by selection of
a) the light filter(s);
b) the irradiance level;
c) the temperature during light exposure;
d) the relative humidity of the chamber air during light and dark exposures, when test conditions
requiring control of humidity are used;
e) the type of wetting (see 4A);
f) the water temperature and wetting cycle;
g) the timing of the light/dark cycle.
4.4 Wetting is usually produced by spraying the test specimens with demineralized/deionized water, by immersion in water or by condensation of water vapour onto the surfaces of the specimens.
4.5 The procedure shall include measurements of the irradiance and radiant exposure in the plane of the specimens.
4.6 It is recommended that a similar material of known performance (a control) be exposed simultaneously with the test specimens to provide a standard for comparative purposes.
4.7 Intercomparison of results obtained from specimens exposed in different equipments should not be made unless an appropriate statistical relationship has been established between the equipments for the particular material to be tested.ISO 16474-2 pdf free download.
Tags: Paints and varnishes
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