1. Scope 1.1 This practice covers the selection of test conditions for accelerated exposure testing of coatings and related products in enclosed carbon-arc devices operated according to Practice G23. Both types are manufactured with or without automatic humidity control. Table 1 describes commonly used test conditions. Interlaboratory comparisons must only be made using the same device type and test conditions. 1.2 The procedures described in this practice were previously included in Practice D822, which covered the use of both filtered open flame and enclosed carbon arcs for testing paints, varnishes, lacquers, and related products. Practice D822 describes exposures in filtered open-flame carbon-arc devices only. Note 1-Another procedure for exposing these products is covered by Practice D3361, in which the specimens are subjected to radiation from an unfiltered open-flame carbon arc that produces much higher levels of short wavelength radiation than filtered open-flame or enclosed carbon arcs. Only automatic humidity controlled open-flame carbon-arc apparatus (Type EH) is applicable to Practice D3361. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 4.