ISO 877-3:2018
Plastics — Methods of exposure to solar radiation — Part 3: Intensified weathering using concentrated solar radiation
ISO 877-3:2018 specifies a method for exposing plastics to concentrated solar radiation using reflecting concentrators to accelerate the weathering processes. The purpose is to assess property changes produced after specified stages of such exposures. The reflecting concentrators used in these exposures are sometimes referred to as "Fresnel reflectors" because in cross-section the array of mirrors used to concentrate the solar radiation resembles the cross-section of a Fresnel lens.
General guidance concerning the scope of the ISO 877 series is given in ISO 877‑1.
NOTE Additional information about solar concentrating exposures, including a partial list of standards in which they are specified, is given in the Bibliography.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test specimens
7 Exposure conditions
7.1 Orientation of mirrors
7.2 Exposure site
7.3 Temperature control
7.4 Irradiance level
8 Exposure stages
8.1 General
8.2 Solar radiant exposure
8.2.1 Guidance for selection of the exposure stage
8.2.2 Instrumental measurement of solar radiant exposure
9 Procedure
9.1 Mounting of test specimens
9.2 Mounting of reference materials (if used)
9.3 Climatic observations
9.4 Exposure of test specimens
9.4.1 General
9.4.2 Exposure cycles
9.4.3 Testing under glass
10 Expression of results
10.1 Determination of changes in properties
10.2 Climatic conditions and observations
10.2.1 General
10.2.2 Temperature
10.2.3 Relative humidity
10.2.4 Levels (values) of exposure stages
10.2.5 Precipitation
10.2.6 Time of wetness
10.2.7 Other observations
11 Test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test specimens
7 Exposure conditions
7.1 Orientation of mirrors
7.2 Exposure site
7.3 Temperature control
7.4 Irradiance level
8 Exposure stages
8.1 General
8.2 Solar radiant exposure
8.2.1 Guidance for selection of the exposure stage
8.2.2 Instrumental measurement of solar radiant exposure
9 Procedure
9.1 Mounting of test specimens
9.2 Mounting of reference materials (if used)
9.3 Climatic observations
9.4 Exposure of test specimens
9.4.1 General
9.4.2 Exposure cycles
9.4.3 Testing under glass
10 Expression of results
10.1 Determination of changes in properties
10.2 Climatic conditions and observations
10.2.1 General
10.2.2 Temperature
10.2.3 Relative humidity
10.2.4 Levels (values) of exposure stages
10.2.5 Precipitation
10.2.6 Time of wetness
10.2.7 Other observations
11 Test report
Bibliography