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ASTM G224-23

(Practice)

Standard Practice for Operating UVC Lamp Apparatus for Exposure of Materials

Standard Practice for Operating UVC Lamp Apparatus for Exposure of Materials

SIGNIFICANCE AND USE
5.1 Material resistance to photodegradation caused by exposure to artificial UVC light sources is a growing concern due to the use of ultraviolet germicidal irradiation (UVGI) to mitigate the spread of infectious diseases.  
5.2 Materials and products intended for direct sunlight exposure are typically designed to resist the effects of the UVA and UVB light reaching the earth’s surface, but generally they are not tested to determine the effects of exposure to UVC, which is filtered out by the atmosphere.  
5.3 Compared to light in the UVA and UVB regions of the electromagnetic spectrum, UVC light, when absorbed by a material, can cause photodegradation to proceed at different rates and by different mechanisms as well as confining degradation to a thinner surface layer.  
5.4 Indoor materials and products, which typically are not designed to withstand significant ultraviolet light exposure, are at even greater risk of premature degradation when subjected to UVC exposure.  
5.5 This practice is intended to induce property changes consistent with those experienced by materials exposed to artificial UVC light sources with a similar spectral irradiance distribution to those specified in this practice.
SCOPE
1.1 This practice is limited to the basic principles for operating a low-pressure mercury lamp apparatus to assess degradation of materials due to exposure to UVC light; on its own, it does not deliver a specific result.  
1.2 It is intended to be used in conjunction with a practice or method that defines specific exposure conditions for an application along with a means to evaluate changes in material properties. This practice is intended to reproduce the photodegradation effects that occur when materials are exposed to artificial light sources that emit radiation primarily in the UVC wavelength band, particularly in the range of 240 nm to 280 nm. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure.
Note 1: Practice G151 describes general procedures to be used when exposing materials in accelerated test devices that use laboratory light sources.
Note 2: A common use of UVC light sources is for the disinfection of surfaces and air, a process known as ultraviolet germicidal irradiation (UVGI). Water disinfection applications using UVC light sources have been in use for many decades.  
1.3 This practice does not cover other light sources (e.g. LEDs, excimer lamps, etc.) or any lamps that emit wavelengths primarily outside the range in 1.2.  
1.4 Specimens are exposed to UVC light controlled to a specified irradiance level under controlled temperature conditions.  
1.5 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151.  
1.6 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Jan-2023
ICS
29.140.30 - Fluorescent lamps. Discharge lamps
Technical Committee
G03 - Weathering and Durability
Drafting Committee
G03.03 - Simulated and Controlled Exposure Tests
Current Stage
Ref Project

Relations

Refers
ASTM G130-12(2020) - Standard Test Method for Calibration of Narrow- and Broad-Band Ultraviolet Radiometers Using a Spectroradiometer
Effective Date
01-Jun-2020

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ASTM G224-23 - Standard Practice for Operating UVC Lamp Apparatus for Exposure of MaterialsASTM G224-23 - Standard Practice for Operating UVC Lamp Apparatus for Exposure of Materials
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ASTM G224-23 - Standard Practice for Operating UVC Lamp Apparatus for Exposure of Materials
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G224 − 23
Standard Practice for
1
Operating UVC Lamp Apparatus for Exposure of Materials
This standard is issued under the fixed designation G224; 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 priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This practice is limited to the basic principles for
1.8 This international standard was developed in accor-
operating a low-pressure mercury lamp apparatus to assess
dance with internationally recognized principles on standard-
degradation of materials due to exposure to UVC light; on its
ization established in the Decision on Principles for the
own, it does not deliver a specific result.
Development of International Standards, Guides and Recom-
1.2 It is intended to be used in conjunction with a practice or
mendations issued by the World Trade Organization Technical
method that defines specific exposure conditions for an appli-
Barriers to Trade (TBT) Committee.
cation along with a means to evaluate changes in material
properties. This practice is intended to reproduce the photo- 2. Referenced Documents
2
degradation effects that occur when materials are exposed to
2.1 ASTM Standards:
artificial light sources that emit radiation primarily in the UVC
G113 Terminology Relating to Natural and Artificial Weath-
wavelength band, particularly in the range of 240 nm to
ering Tests of Nonmetallic Materials
280 nm. This practice is limited to the procedures for
G130 Test Method for Calibration of Narrow- and Broad-
obtaining, measuring, and controlling conditions of exposure.
Band Ultraviolet Radiometers Using a Spectroradiometer
G151 Practice for Exposing Nonmetallic Materials in Accel-
NOTE 1—Practice G151 describes general procedures to be used when
exposing materials in accelerated test devices that use laboratory light erated Test Devices that Use Laboratory Light Sources
sources.
G154 Practice for Operating Fluorescent Ultraviolet (UV)
NOTE 2—A common use of UVC light sources is for the disinfection of
Lamp Apparatus for Exposure of Materials
surfaces and air, a process known as ultraviolet germicidal irradiation
3
2.2 IEC Standards:
(UVGI). Water disinfection applications using UVC light sources have
IEC 60335-1 Household and similar electrical appliances -
been in use for many decades.
Safety - Part 1: General requirements
1.3 This practice does not cover other light sources (e.g.
LEDs, excimer lamps, etc.) or any lamps that emit wavelengths
3. Terminology
primarily outside the range in 1.2.
3.1 Definitions:
1.4 Specimens are exposed to UVC light controlled to a
3.1.1 The definitions given in Terminology G113 are appli-
specified irradiance level under controlled temperature condi-
cable to this practice.
tions.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 As used in this practice, the term sunlight is identical
1.5 Specimen preparation and evaluation of the results are
to the terms daylight and solar irradiance, global as they are
covered in ASTM methods or specifications for specific
defined in Terminology G113.
materials. General guidance is given in Practice G151.
3.2.2 UVC, n—portion of the electromagnetic spectrum
1.6 Units—The values stated in SI units are to be regarded
comprising wavelengths between 100 nm and 280 nm, also
as standard. No other units of measurement are included in this
spelled UV-C.
standard.
1.7 This standard does not purport to address all of the 4. Summary of Practice
safety concerns, if any, associated with its use. It is the
4.1 Specimens are exposed to a UVC light source under
responsibility of the user of this standard to establish appro-
controlled conditions of irradiance and temperature.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This practice is under the jurisdiction of ASTM Committee G03 on Weathering contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and Durability and is the direct responsibility of Subcommittee G03.03 on Standards volume information, refer to the standard’s Document Summary page on
Simulated and Controlled Exposure Tests. the ASTM website.
3
Current edition approved Feb. 1, 2023. Published March 2023. DOI: 10.1520/ Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
G0224-23. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Bar
...

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SCOPE
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SIGNIFICANCE AND USE
4.1 This guide is intended to be used in the selection and installation of waterstops in cast-in-place concrete construction. This guide is intended to assist the building owner, owner’s representative, architect, engineer, contractor, and/or authorized inspector during the specification and installation of waterstops.  
4.2 This guide is applicable to cast-in-place concrete construction. The use of this guide may not be appropriate for installation of waterstops in other types of concrete construction, including but not limited to, pneumatically applied (that is, shotcrete) and precast concrete construction.
SCOPE
1.1 This guide covers the use of waterstops within cast-in-place concrete construction. Waterstops are generally placed within static, non-moving construction joints in concrete to close off the joint to water, which may be under significant hydrostatic pressure. They are used as part of the overall waterproofing strategy for a building or other structure. Expansion and other types of moving joints may require the use of waterstops, which can accommodate the anticipated movement of the structure and are beyond the scope of this guide.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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