introduction
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ISO 16474-2-2013 Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: xenon arc lamps

The committee responsible for this document is ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for Paints and varnishes.

The first edition of ISO 16474-2, together with ISO 16474-1, cancelled and replaced the technically revised ISO 11341:2004.

ISO 16474 consists of the following parts, under the general heading Paints and varnishes – Methods of exposure to laboratory light sources:

– Part 1: General guidance

– Part 2: Xenon arc lamp

– Part 3: Fluorescent UV lamps

– Part 4: Open carbon arc lamp

introduce
Coatings of paints, varnishes and similar materials (later simply referred to as coatings) are exposed to laboratory light sources in order to simulate in the laboratory the aging process that occurs during natural weathering or exposure tests under glass covers.

ISO 16474-2-2013 Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: xenon arc lamps

1 Range
This part of ISO 16474 specifies methods of exposing specimens to xenon arc light in the presence of moisture in order to reproduce the weathering effects that occur when the material is exposed to daylight or sunlight filtered through window glass in an actual end-use environment.

The sample is exposed to filtered xenon arc light under controlled conditions (temperature, humidity, and/or wetting). Various types of xenon arc lamps and various filter combinations can be used to meet all requirements for testing different materials.

Sample preparation and result evaluation are covered in other international standards for specific materials.

General guidance is given in ISO 16474-1.

Note that xenon arc exposure of plastics is described in ISO 4892-2.

ISO 16474-2-2013 Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: xenon arc lamps

2 Normative references
All or part of the following documents are referred to normatively in this document and are required for their application. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 4618, paints and varnishes – Terms and definitions

ISO 9370, Plastics – Instrumental determination of radiation exposure in ageing tests – General guidance and basic test methods

ISO 16474-1, Paints and varnishes – Methods of exposure to laboratory light sources – Part 1: General guidance

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following articles apply.

3.1 Radiation exposure H

Test panel exposure to radiation energy

Note 1: Radiant exposure is given by the formula

ISO 16474-2-2013 Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: xenon arc lamps

H is radiation exposure, measured in joules per square meter;

E is irradiance, in watts per square meter;

t is the exposure time, in seconds.

Note 2: If the irradiance E is constant throughout the exposure time, the radiant exposure H is given only by the product of E and t.

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