Betekenis en gebruik
5.1 The device exposes the specimen to light, heat and optional moisture, typically attempting to replicate the changes in specimen characteristics observed in both outdoor and indoor end-use environments. Blootstelling is niet bedoeld om verslechtering te simuleren die wordt veroorzaakt door lokale weersverschijnselen zoals luchtvervuiling, biologische aanvallen, en blootstelling aan zout water.

5.2 This practice allows for a wide range of exposure conditions that may produce significantly different results. Daarom, the results of its use should not be referred to unless accompanied by a report in section 10 detailing specific operating conditions.

5.2.1 Controls (similar materials with known properties) should be exposed at the same time as the sample to provide a reference for comparison purposes. It is better to use two different control materials: one known to have relatively poor durability and the other known to have relatively good durability. Each sample and control material should be repeated at least three times at the same time for statistical evaluation of the results.

ASTM G155-2021 Practice for Xenon Arc Lamp Equipment for Exposure of Non-Metallic Materials

5.3 Results obtained from specimens exposed in different devices (even if the device is of the same model) using the same set point and operational controls should not be compared unless repeatability of the material to be tested has been established between devices.

5.4 Please refer to Practice G151 for warning guidelines applicable to all laboratory aging equipment.

5.5 Users are advised to follow good laboratory practices to reduce exposure variability (1). 8

Straal
1.1 This practice is limited to the basic principles and procedures for operating xenon arc lamps and water installations; By itself, it does not provide specific results.

1.2 It is intended to be used in conjunction with practices or methods that define specific exposure conditions for applications and methods for assessing changes in material properties. This practice aims to reproduce the weathering effects that occur when materials are exposed to sunlight (directly or through window glass) en vocht (such as humidity, regen, or dew) during actual use. Deze praktijk is beperkt tot procedures voor het verkrijgen, meten, en het beheersen van de blootstellingsomstandigheden.

ASTM G155-2021 Practice for Xenon Arc Lamp Equipment for Exposure of Non-Metallic Materials

Opmerking 1: A number of exposure procedures are listed in the appendix; Echter, this practice does not specify the appropriate exposure conditions for the material to be tested.

Opmerking 2: Practice G151 describes the general procedures and performance requirements used when exposing materials in equipment that uses laboratory light sources.

1.3 Onder gecontroleerde omgevingsomstandigheden, the sample is exposed to light from an optically filtered xenon arc lamp. The combinations of different types of filters and xenon arc sources are described.

1.4 Sample preparation and result evaluation are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151.

Opmerking 3: General information on methods for determining post-exposure changes in properties and reporting these results is described in Practice D5870.

1.5 This practice does not apply to corrosion testing of bare metals.

1.6 Units – Waarden uitgedrukt in SI-eenheden moeten als standaardwaarden worden beschouwd. In deze standaard zijn geen andere meeteenheden opgenomen.

1.7 This practice is technically similar to the following ISO documents: ISO 4892-2, ISO 16474-2, ISO 105-B02, ISO 105-B04, ISO 105-B05, ISO 105-B06 and ISO 105-B10.

ASTM G155-2021 Practice for Xenon Arc Lamp Equipment for Exposure of Non-Metallic Materials

1.8 Deze norm is niet bedoeld om alle veiligheidsproblemen aan te pakken, indien aanwezig, die verband houden met het gebruik ervan. Het is de verantwoordelijkheid van de gebruikers van deze norm om de juiste veiligheid te garanderen, gezondheids- en milieupraktijken en om vóór gebruik de toepasbaarheid van wettelijke beperkingen vast te stellen.

1.8.1 If the operation of the lamp produces any ozone, het moet via het uitlaatsysteem uit het monster en de operator worden verwijderd.

1.9 Deze internationale norm is gebaseerd op internationaal erkende standaardisatieprincipes die zijn vastgelegd in het Besluit over de beginselen voor de ontwikkeling van internationale normen, Richtlijnen en aanbevelingen uitgegeven door het WTO-comité voor technische handelsbelemmeringen.