ASTM D5894-21

Standard Practice for Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating Exposures in a Fog/Dry Cabinet and a UV/Condensation Cabinet)

SIGNIFICANCE AND USE
5.1 The outdoor corrosion of painted metals is influenced by many factors, including: corrosive atmospheres, rain, condensed dew, UV light, wet/dry cycling, and temperature cycling. These factors frequently have a synergistic effect on one another. This practice is intended to provide a more realistic simulation of the interaction of these factors than is found in traditional tests with continuous exposure to a static set of corrosive conditions.  
5.2 Results obtained from this practice can be used to compare the relative durability of materials subjected to the specific test cycle used.  
5.3 No single exposure test can be specified as a complete simulation of actual use conditions in outdoor environments. Results obtained from exposures conducted according to this practice can be considered as representative of actual outdoor exposures only when the degree of rank correlation has been established for the specific materials being tested. The relative durability of materials in actual outdoor service can be very different in different locations because of differences in UV radiation, time of wetness, temperature, pollutants, and other factors. Therefore, even if results from a specific artificial test condition are found to be useful for comparing the relative durability of materials exposed in a particular exterior environment, it cannot be assumed that they will be useful for determining relative durability for a different environment.  
5.4 Even though it is very tempting, it is not recommended to calculate an “acceleration factor” relating x hours of laboratory exposure to y months of exterior exposure. Different materials and different formulations of the same material can have significantly different acceleration factors. The acceleration factor also varies depending on the variability in rate of degradation in the laboratory test and in actual outdoor exposure.  
5.5 This practice is best used to compare the relative performance of materials tested at th...
SCOPE
1.1 This practice covers basic principles and operating practice for cyclic corrosion/UV exposure of paints on metal, using alternating periods of exposure in two different cabinets: a cycling salt fog/dry cabinet, and a fluorescent UV/condensation cabinet.  
1.2 This practice is limited to the methods of obtaining, measuring, and controlling exposure conditions, and procedures. It does not specify specimen preparation nor evaluation of results.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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.  
1.5 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-May-2021
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.27 - Accelerated Testing

Standards Content (Sample)

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: D5894 − 21
Standard Practice for
Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating
Exposures in a Fog/Dry Cabinet and a UV/Condensation
1
Cabinet)
This standard is issued under the fixed designation D5894; 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* D1654 Test Method for Evaluation of Painted or Coated
Specimens Subjected to Corrosive Environments
1.1 This practice covers basic principles and operating
D4587 Practice for Fluorescent UV-Condensation Expo-
practice for cyclic corrosion/UV exposure of paints on metal,
sures of Paint and Related Coatings
using alternating periods of exposure in two different cabinets:
G85 Practice for Modified Salt Spray (Fog) Testing
a cycling salt fog/dry cabinet, and a fluorescent UV/
G113 Terminology Relating to Natural andArtificial Weath-
condensation cabinet.
ering Tests of Nonmetallic Materials
1.2 This practice is limited to the methods of obtaining,
G147 Practice for Conditioning and Handling of Nonmetal-
measuring, and controlling exposure conditions, and proce-
lic Materials for Natural and Artificial Weathering Tests
dures. It does not specify specimen preparation nor evaluation
G151 Practice for Exposing Nonmetallic Materials inAccel-
of results.
erated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Ultraviolet (UV)
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this Lamp Apparatus for Exposure of Nonmetallic Materials
standard.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions—ThedefinitionsgiveninTerminologyG113
safety concerns, if any, associated with its use. It is the
are applicable to this practice.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Summary of Practice
mine the applicability of regulatory limitations prior to use.
4.1 The test specimens are exposed to alternating periods of
1.5 This international standard was developed in accor-
one week in a fluorescent UV/condensation chamber followed
dance with internationally recognized principles on standard-
by one week in a cyclic salt fog/dry chamber. The fluorescent
ization established in the Decision on Principles for the
2
UV/condensation cycle is 4 h UV at 0.89 W/(m · nm) at
Development of International Standards, Guides and Recom-
340 nm at 60°C followed by 4 h condensation at 50°C, using
mendations issued by the World Trade Organization Technical
UVA-340 lamps. The fog/dry chamber runs a cycle of 1 h fog
Barriers to Trade (TBT) Committee.
at ambient temperature and 1 h dry-off at 35°C. The fog
2. Referenced Documents
electrolyte is a relatively dilute solution, with 0.05 % sodium
2
chloride and 0.35 % ammonium sulfate.
2.1 ASTM Standards:
D610 Practice for Evaluating Degree of Rusting on Painted
5. Significance and Use
Steel Surfaces
5.1 Theoutdoorcorrosionofpaintedmetalsisinfluencedby
D714 Test Method for Evaluating Degree of Blistering of
many factors, including: corrosive atmospheres, rain, con-
Paints
densed dew, UV light, wet/dry cycling, and temperature
cycling. These factors frequently have a synergistic effect on
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
one another. This practice is intended to provide a more
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.27 on Accelerated Testing.
realistic simulation of the interaction of these factors than is
CurrenteditionapprovedJune1,2021.PublishedJuly2021.Originallyapproved
found in traditional tests with continuous exposure to a static
in 1996. Last previous edition approved in 2016 as D5894 – 16. DOI: 10.1520/
set of corrosive conditions.
D5894-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Results obtained from this practice can be used to
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
compare the relative durability of materials subjected to the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. specific test cycle used.
*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 ----------
...

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: D5894 − 16 D5894 − 21
Standard Practice for
Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating
Exposures in a Fog/Dry Cabinet and a UV/Condensation
1
Cabinet)
This standard is issued under the fixed designation D5894; 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*
1.1 This practice covers basic principles and operating practice for cyclic corrosion/UV exposure of paints on metal, using
alternating periods of exposure in two different cabinets: a cycling salt fog/dry cabinet, and a fluorescent UV/condensation cabinet.
1.2 This practice is limited to the methods of obtaining, measuring, and controlling exposure conditions, and procedures. It does
not specify specimen preparation nor evaluation of results.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
D714 Test Method for Evaluating Degree of Blistering of Paints
D1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
D4587 Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings
G85 Practice for Modified Salt Spray (Fog) Testing
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.27 on Accelerated Testing.
Current edition approved April 1, 2016June 1, 2021. Published May 2016July 2021. Originally approved in 1996. Last previous edition approved in 20102016 as
D5894 – 10.D5894 – 16. DOI: 10.1520/D5894-16.10.1520/D5894-21.
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.
*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 ----------------------
D5894 − 21
3. Terminology
3.1 Definitions—The definitions given in Terminology G113 are applicable to this practice.
4. Summary of Practice
4.1 The test specimens are exposed to alternating periods of one week in a fluorescent UV/condensation chamber followed by one
2
week in a cyclic salt fog/dry chamber. The fluorescent UV/condensation cycle is 4-h4 h UV at 0.89 W/(m · nm) at 340 nm 340 nm
at 60°C followed by 4-h4 h condensation at 50°C, using UVA-340 lamps. The fog/dry chamber runs a cycle of 1-h1 h fog at
ambient temperature and 1-h1 h dry-off at 35°C. The fog electrolyte is a relatively dilute solution, with 0.05 % sodium chloride
and 0.35 % ammonium sulfate.
5. Significance and Use
5.1 The outdoor corrosion of painted metals is influenced by many factors, including: corrosive atmospheres, rain, condensed dew,
UV light, wet/dry cycling, and temperature cycling. These factors frequently have a synergistic effect on one another. This practice
is intended to provide a more realistic simulation of the interaction of these factors
...