ASTM D 822-2018 “Flame Carbon Arc Exposure Test for Filter Filtration for Paints and Related Coatings”

Meaning and Purpose
4.1 For many applications, the ability of a paint or coating to resist deterioration of physical and optical properties due to exposure to light, heat, and water may be very important. This practice aims to cause changes in attributes related to end-use conditions, including the effects of sunlight, moisture, and heat. The exposures used in this practice are not intended to model the deterioration caused by local weather phenomena such as atmospheric pollution, biological attack, and saline-water exposure.

4.2 Caveats – Results may change when different operating conditions are used. Therefore, no reference to the use of this practice may be made unless accompanied by a report prepared under Section 10 describing the specific operating conditions used. See Practice G151 for details of the caveats applicable to the use of the results obtained under this practice.

Note 1: For additional information on sources of variability and strategies to address variability in the design, execution, and data analysis of laboratory accelerated exposure trials, see Guide G141.

4.2.1 The spectral power profiles of light from an open flame carbon arc are significantly different from those generated by light and water exposure equipment using other carbon arc configurations or other light sources. The type and rate of degradation and performance ranking produced by exposure to filtered open flame carbon arcs may be quite different from those produced by exposure to other types of laboratory light sources.

ASTM D 822-2018 “Flame Carbon Arc Exposure Test for Filter Filtration for Paints and Related Coatings”

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same type of carbon arcs, filters, and exposure conditions.

4.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of the material according to the performance class compared to other materials or controls. Iv,5 Therefore, it is highly recommended to expose similar materials with known properties (control) at the same time as the test material. At least three replications of each material are recommended to allow statistical evaluation of the results.

4.4 Test results will depend on the degree of care with which the equipment is operated according to practice G152. Important factors include regulation of line voltage, absence of salt or other water deposits, temperature and humidity control, and electrode conditions.

4.5 All exposures referred to in accordance with this practice shall include a complete description of the test period used.

ASTM D 822-2018 “Flame Carbon Arc Exposure Test for Filter Filtration for Paints and Related Coatings”

Scope of
1.1 This practice covers the selection of conditions for accelerated exposure testing of coatings and related products in filtered open-flame carbon arc devices in accordance with Practices G151 and G152. The practice also includes preparation of specimens, suitable test conditions for coatings, and evaluation of test results. Table 1 describes the commonly used test conditions.

1.2 This practice does not include closed carbon arc exposure of paint and associated coatings, which is described in Practice D5031 / D5031M. Practice D3361/D3361M covers an additional procedure for exposing these products, where specimens are exposed to radiation from an unfiltered open flame carbon arc, which produces shorter wavelengths and higher levels of shorter-wavelength radiation compared to filtered open or closed carbon arcs.

1.3 Values expressed in SI units or inch-pound units should be treated separately as standard values. The values specified in each system may not be exactly equivalent; Therefore, each system should be used independently of each other. Merging the values of the two systems may result in non-compliance with the criteria.

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

1.5 This international Standard has been developed in accordance with the 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.

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