ASTM G24是在透過(guò)玻璃的日光下進(jìn)行曝露試驗(yàn)的標(biāo)準(zhǔn)測(cè)試方法： 本標(biāo)準(zhǔn)用于評(píng)價(jià)非金屬材料耐玻璃過(guò)濾的太陽(yáng)輻射的能力。標(biāo)準(zhǔn)限于開展暴露的方法。試驗(yàn)樣品的制備和結(jié)果的評(píng)定在特定材料的各種標(biāo)準(zhǔn)中規(guī)定。現(xiàn)行標(biāo)準(zhǔn)修訂于2013年。如需標(biāo)準(zhǔn)的詳細(xì)內(nèi)容請(qǐng)致電400-680-8138.

1. Scope

1.1 This practice evaluates the resistance of nonmetallic materials to solar radiation filtered through glass in passively ventilated and non-vented enclosures. For exposures in under glass enclosures with forced air circulation, refer to Practice G201.

1.2 For direct exposures, refer to Practice G7.

1.3 This practice is limited to the method of conducting the exposures. The preparation of test specimens and evaluation of results are covered in various standards for the specific materials.

1.4 Exposure conducted according to this practice can use two types of exposure cabinets.

1.4.1 Type A—A cabinet that allows passive ventilation of specimens being exposed behind glass.

1.4.2 Type B—Enclosed cabinet with exterior painted black that does not provide for ventilation of specimens exposed behind glass. Exposures conducted using a Type B cabinet are typically referred to as “black box under glass exposures.”

1.5 Type A exposures of this practice are technically similar to Method B of ISO?877-2.

1.6 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.

1.7 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.

2. Referenced Documents

ASTM Standards

C1036 Specification for Flat Glass

D3424 Practice for Evaluating the Relative Lightfastness and Weatherability of Printed Matter

D4303 Test Methods for Lightfastness of Colorants Used in Artists Materials

D6901 Specification for Artists Colored Pencils

E824 Test Method for Transfer of Calibration From Reference to Field Radiometers

E903 Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres

E1084 Test Method for Solar Transmittance (Terrestrial) of Sheet Materials Using Sunlight

G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials

G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials

G173 Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37 Tilted Surface

G177 Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37 Tilted Surface

G201 Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation