Foreword

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical and environmental resistance.

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Introduction

Plastic components under UV irradiation can undergo accelerated degradation when they are exposed to additional mechanical environmental or thermal stresses. Therefore, this document provides a test method for simulated UV radiation effect superimposed by the mechanical load to evaluate the performance of the material and components.

1 Scope

This document describes a test method of exposing specimens to artificial UV radiation in combination with a creep load. This method uses UV radiation source and ISO 899-1 for the tensile creep test. Fluorescent UV lamps specified in ISO 4892-3 or UVC lamp can be used as UV radiation sources.

NOTE UVC exposure is described in IEC 60335-1.

2 Normative references

3 Terms and definitions

4 Principle

5 Apparatus

5.1 General

5.2 Test device for combined exposure

5.3 Laboratory UV radiation source

5.4 Radiometer

5.5 Black-panel/black-standard thermometer

5.6 Creep device

5.7 Assessment of changes in properties

6 Test specimens

7 Test conditions for combined exposure

8 Procedure

8.1 General

8.2 Mounting of the test specimen

8.3 Combined exposure

8.4 Extension measurement schedule

8.5 Time measurement for creep

8.6 Measurement of radiant exposure

8.7 Determination of the changes in properties after exposure

9 Test report