ASTM G24-13

Standard Practice for Conducting Exposures to Daylight Filtered Through Glass

SIGNIFICANCE AND USE
4.1 Since solar radiation, air temperature, relative humidity, and the amount and kind of atmospheric contaminants vary continuously, results from exposures based on elapsed time may differ. The variations in the results may be minimized by timing the exposures in terms of:  
4.1.1 One or more environmental parameters such as solar radiant exposure, or  
4.1.2 A predefined property change of a weathering reference specimen with known performance.  
4.2 Variations in temperature, moisture and atmospheric contaminants can have a significant effect on the degradation caused by solar radiation. In addition, exposures conducted at different times of the year can cause large differences in rate of degradation. Different materials may have different sensitivities to heat, moisture, and atmospheric contaminants, which may explain differences in rankings of specimens exposed to equivalent solar radiant exposure when other environmental conditions vary.  
4.3 Since the method of mounting may influence the temperature and other parameters during exposure of the specimen, there should be a mutual understanding as to the method of mounting the specimen for the particular exposure test under consideration.  
4.4 There can be large differences among various single strength window glasses in their transmittance in the 300 to 350 nm region. For example, at 320 nm, the percent transmittance for seven different lots of single strength window glass ranged from 8.4 to 26.8 %. At 380 nm, the percent transmittance ranged from 84.9 % to 88.1 %.6  
4.5 Differences in UV transmittance between different lots of glass persist after solarization. The largest differences among window glasses in UV transmittance are in the spectral range of 300 to 320 nm.  
4.6 This practice is best used to compare the relative performance of materials tested at the same time behind the same lot of glass. Because of variability between lots of glass and between exposures conducted at different times of th...
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.

General Information

• Status: Historical
• Publication Date: 31-May-2013
• ICS: 59.080.01 - Textiles in general
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.02 - Natural and Environmental Exposure Tests

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G24 − 13
Standard Practice for
1
Conducting Exposures to Daylight Filtered Through Glass
ThisstandardisissuedunderthefixeddesignationG24;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* D3424Practice for Evaluating the Relative Lightfastness
and Weatherability of Printed Matter
1.1 This practice evaluates the resistance of nonmetallic
D4303Test Methods for Lightfastness of Colorants Used in
materials to solar radiation filtered through glass in passively
Artists’Materials
ventilated and non-vented enclosures. For exposures in under
D6901Specification for Artists’Colored Pencils
glass enclosures with forced air circulation, refer to Practice
E824Test Method for Transfer of Calibration From Refer-
G201.
ence to Field Radiometers
1.2 For direct exposures, refer to Practice G7.
E903Test Method for Solar Absorptance, Reflectance, and
1.3 This practice is limited to the method of conducting the Transmittance of Materials Using Integrating Spheres
E1084Test Method for Solar Transmittance (Terrestrial) of
exposures.Thepreparationoftestspecimensandevaluationof
results are covered in various standards for the specific Sheet Materials Using Sunlight
G7Practice forAtmospheric Environmental Exposure Test-
materials.
ing of Nonmetallic Materials
1.4 Exposure conducted according to this practice can use
G113Terminology Relating to Natural andArtificialWeath-
two types of exposure cabinets.
ering Tests of Nonmetallic Materials
1.4.1 Type A—A cabinet that allows passive ventilation of
G173TablesforReferenceSolarSpectralIrradiances:Direct
specimens being exposed behind glass.
Normal and Hemispherical on 37° Tilted Surface
1.4.2 Type B—Enclosed cabinet with exterior painted black
G177Tables for Reference Solar Ultraviolet Spectral Distri-
that does not provide for ventilation of specimens exposed
butions: Hemispherical on 37° Tilted Surface
behind glass. Exposures conducted using a Type B cabinet are
G201Practice for Conducting Exposures in Outdoor Glass-
typically referred to as “black box under glass exposures.”
Covered Exposure Apparatus with Air Circulation
1.5 TypeAexposuresofthispracticearetechnicallysimilar
2.2 Other Documents:
to Method B of ISO877-2.
WMO Guide to Meteorological Instruments and Methods of
3
Observation WMO No. 8,Seventh Edition.
1.6 The values stated in SI units are to be regarded as the
standard. The inch-pound units given in parentheses are for ISO 105 B01Textiles—Tests for Colour Fastness, Interna-
4
tional Standards Organization, Geneva, Switzerland.
information only.
ISO 877-1Plastics – Methods of Exposure to Solar Radia-
1.7 This standard does not purport to address all of the
4
tion – Part 1: General Guidance
safety concerns, if any, associated with its use. It is the
ISO 877–2Plastics – Methods of Exposure to Solar Radia-
responsibility of the user of this standard to establish appro-
tion – Part 2: Direct Weathering and Exposure Behind
priate safety and health practices and determine the applica-
Window Glas
bility of regulatory limitations prior to use.
5
AATCC TM 16, Option 6Colorfastness to Light, Daylight
2. Referenced Documents
AATCC Test Method 16.1-2012Colorfastness to Light:
2
Outdoor
2.1 ASTM Standards:
C1036Specification for Flat Glass
3. Terminology
1
3.1 Definitions:
ThispracticeisunderthejurisdictionofASTMCommitteeG03onWeathering
and Durabilityand is the direct responsibility of Subcommittee G03.02 on Natural
and Environmental Exposure Tests.
3
CurrenteditionapprovedJune1,2013.PublishedJuly2013.Originallyapproved AvailablefromWorldMeteorologicalOrganization(WMO),7bis,avenuedela
in1973.Lastpreviouseditionapprovedin2005asG24–05.DOI:10.1520/G0024- Paix,CasePostaleNo.2300,CH-1211Geneva2,Switzerland,http://www.wmo.int.
4
13. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4th Floor, New York, NY 10036, http://www.ansi.org.
5
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from American Association of Textile Chemists and Colorists
Standards volume information, refer to the standard’s Document Summary page on (AATCC), P.O. Box 12215, Research Triangle Park, NC 27709, http://
the ASTM website. www.aatcc.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G24−13
3.1.1 The definitions contained in Terminology G113 are
applicable to this practice.
4. Significance and Use
4
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G24 − 05 G24 − 13
Standard Practice for
1
Conducting Exposures to Daylight Filtered Through Glass
This standard is issued under the fixed designation G24; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This practice evaluates the resistance of nonmetallic materials to solar radiation filtered through glass.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 allows no 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.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
2
2.1 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
2.2 Other Documents:
3
WMO Guide to Meteorological Instruments and Methods of Observation WMO No. 8, FifthSeventh Edition.
4
ISO 105 B01 Textiles—Tests for Colour Fastness, International Standards Organization, Geneva, Switzerland.
1
This practice is under the jurisdiction of ASTM Committee G03 on Weathering and Durabilityand is the direct responsibility of Subcommittee G03.02 on Natural and
Environmental Exposure Tests.
Current edition approved Jan. 1, 2005June 1, 2013. Published February 2005July 2013. Originally approved in 1973. Last previous edition approved in 19972005 as
G24 – 97.G24 – 05. DOI: 10.1520/G0024-05.10.1520/G0024-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from World Meteorological Organization, Geneva, Switzerland. Organization (WMO), 7bis, avenue de la Paix, Case Postale No. 2300, CH-1211 Geneva 2,
Switzerland, http://www.wmo.int.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G24 − 13
ISO 877877-1 Plastics—Methods Plastics – Methods of Exposure to Direct Weathe
...