Meaning and use
5.1 The use of the equipment is intended to cause changes in performance related to the conditions of end use, including the effects of sunlight, moisture and heat. These exposures may include methods of introducing moisture to the specimen. Exposure is not intended to simulate deterioration caused by local weather phenomena such as atmospheric pollution, biological attacks, and salt water exposure. Alternatively, exposure can simulate the effects of sunlight passing through a window pane. Often, these exposures will include moisture in the form of humidity.

Note 2: Please refer to Practice G151 for the complete warning guidelines applicable to all laboratory aging equipment.

5.2 Changes in results may be expected when operating conditions vary within the acceptable limits of this practice. Consequently, no reference to the results of the use of this approach may be made unless accompanied by a report detailing the specific operating conditions of section 10.

5.2.1 It is recommended that similar materials (controls) with known properties be exposed at the same time as the sample to provide a standard for comparison purposes. It is better to use control materials that are known to have relatively poor durability and good performance. It is recommended that at least three replicates of each evaluated material be performed in each test to allow for statistical evaluation of the results

ASTM G152-2021 Standard Practice for Operation of Open Flame Carbon Arc Instruments for Exposure of Non-Metallic Materials

adius
1.1 This practice covers the fundamentals and operating procedures for the use of open flame carbon arcs and water installations and aims to reproduce the weathering effects that occur when materials are exposed to sunlight (directly or through window panes) and moisture (such as rain or dew) in actual use. This practice is limited to procedures for obtaining, measuring, and controlling exposure conditions. Some exposure procedures are listed in the appendix; However, this practice does not specify the appropriate exposure conditions for the material under test.

Note 1: Practice G151 describes performance standards for all exposure equipment using laboratory light sources. This practice replaces Practice G23, which describes the very specific design of equipment for carbon arc exposure. The equipment described in Practice G23 is covered by this practice.

1.2 Under controlled environmental conditions, the sample is exposed to filtered open flame carbon arc light. Different filters are described.

ASTM G152-2021 Standard Practice for Operation of Open Flame Carbon Arc Instruments for Exposure of Non-Metallic Materials

1.3 Sample preparation and result evaluation are included in the material specific method or specification. General guidance is given in Practice G151 and ISO 4892-1. More specific information is described in Practice D5870 about methods for determining post-exposure characteristic changes and reporting these results.

1.4 Values expressed in SI units shall be considered standard.

1.5 This standard is not intended to address all safety concerns, if any, associated with its use. It is the responsibility of users of this standard to establish appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use.

1.5.1 If any ozone is generated by the operation of the light source, it should be removed from the sample and the operator through the exhaust system.

1.6 This practice is technically similar to ISO 4892-4.

1.7 This international standard is based on internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.