1、Designation: D5031 01 (Reapproved 2006)D5031/D5031M 13Standard Practice forEnclosed Carbon-Arc Exposure Tests of Paint and RelatedCoatings1This standard is issued under the fixed designation D5031;D5031/D5031M; the number immediately following the designation indicatesthe year of original adoption o
2、r, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope Scope*1.1 This practice covers the selection of test conditions for accelerated e
3、xposure testing of coatings and related products inenclosed carbon arc devices operated according to Practices G151 and G153. This practice also covers the preparation of testspecimens, the test conditions suited for coatings, and the evaluation of test results. Table 1 describes commonly used testc
4、onditions.NOTE 1Previous versions of this practice referenced carbon arc devices described by Practice G23, which described very specific equipment designs.Practice G23 has been withdrawn and replaced by Practice G151, which describes performance criteria for all exposure devices that use laboratory
5、 lightsources, and by Practice G153, which gives requirements for exposing nonmetallic materials in enclosed carbon-arc devices.1.2 This practice does not cover filtered open-flame carbon-arc exposures of paints and related coatings, which is described inPractice D822D822/D822M. Another procedure fo
6、r exposing these products is covered by Practice D3361D3361/D3361M, inwhich the specimens are subjected to radiation from an unfiltered open-flame carbon arc that produces shorter wavelengths andhigher levels of short wavelength radiation than filtered open flame or enclosed carbon arcs.NOTE 1Practi
7、ce D3361D3361/D3361M requires use of open-flame carbon-arc apparatus with automatic humidity control.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. The values given inparentheses are for information only.stated in each system may not be ex
8、act equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof
9、 the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D358 Specification for Wood to Be Used as Panels in Weathering Tests of CoatingsD523 Test Method for Specul
10、ar GlossD609 Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related CoatingProductsD610 Practice for Evaluating Degree of Rusting on Painted Steel SurfacesD659 Method for Evaluating Degree of Chalking of Exterior Paints (Withdrawn 1990)3D660
11、 Test Method for Evaluating Degree of Checking of Exterior PaintsD662 Test Method for Evaluating Degree of Erosion of Exterior PaintsD714 Test Method for Evaluating Degree of Blistering of PaintsD772 Test Method for Evaluating Degree of Flaking (Scaling) of Exterior PaintsD822D822/D822M Practice for
12、 Filtered Open-Flame Carbon-Arc Exposures of Paint and Related CoatingsD823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers1 This practice is under t
13、he jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Current edition approved Nov. 1, 2006Oct. 1, 2013. Published November 2006October 2013. Originally approved in 1989. Last pre
14、vious edition approved in 20012006as D5031 01.D5031 01 (2006). DOI: 10.1520/D5031-01R06.10.1520/D5031_D5031M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the s
15、tandards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.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 ver
16、sion. Becauseit 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 versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes sec
17、tion appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D1186 Test Methods for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to a FerrousBase (Withdrawn 2006)3TABLE 1
18、Test Cycles Commonly Used for Enclosed Carbon-Arc Exposure Testing of Paints and Related CoatingsAUninsulated BlackPanel TemperatureBCycle Number Cycle Description (C) (F) Typical UsesC1 Continuous light102 min light only at 50 5 % RH18 min light and water sprayDRepeated continuously63 2.5 145 5 Gen
19、eral coatings and historical conventionE2 18 h continuous light using:102 min light only at 50 5 % RH18 min light and water spray6 h dark using:95 % relative humidity (no water spray)Repeated continuously63 2.524 1.5145 575 3General coatings3 48 min light at 50 5 % RH12 min light and water sprayRepe
20、ated continuously63 2.5 145 5 Coatings used in original equipment manufacturing4 4 h light at 50 5 % RH4 h dark with water sprayRepeated continuously63 2.5 145 5 Exterior pigmented stains5 12 h light at 50 5 % RH12 h dark water sprayRepeated continuously63 2.5 145 5 Exterior wood stains and clears6
21、8 h light at 50 5 % RH10 h light and water spray6 h dark with water sprayRepeated continuously63 2.5 145 5 Marine enamelsTABLE 1 Test Cycles Commonly Used for Enclosed Carbon-Arc Exposure Testing of Paints and Related CoatingsAUninsulated BlackPanel TemperatureB,C,DCycle Number Cycle DescriptionB,C
22、C F Typical UsesE1 Continuous light102 min light only at 50 10 % RH18 min light and water sprayGRepeated continuously63 2.5 145 5 General coatings and historical conventionF2 18 h continuous light using:102 min light only at 50 10 % RH18 min light and water sprayG6 h dark using:95 % relative humidit
23、y (no water spray)Repeated continuously63 2.524 1.5145 575 3General coatings3 48 min light at 50 10 % RH12 min light and water sprayRepeated continuously63 2.5 145 5 Coatings used in original equipment manufacturing4 4 h light at 50 10 % RH4 h dark with water sprayRepeated continuously63 2.5 145 5 E
24、xterior pigmented stains5 12 h light at 50 10 % RH12 h dark water sprayRepeated continuously63 2.5 145 5 Exterior wood stains and clears6 8 h light at 50 10 % RH10 h light and water spray6 h dark with water sprayRepeated continuously63 2.5 145 5 Marine enamelsA The cycles described are not listed in
25、 any order indicating importance, and are not necessarily recommended for the applications listed.B Unless otherwise specified, operate the device so that the allowable deviations about the set points given in Table 1 are within the specified limits specified in thecorresponding entry. If the actual
26、 operating conditions do not agree with the machine settings after the equipment has stabilized, discontinue the test and correct the causeof the disagreement before continuing.C Set points and operational fluctuations are listed as set point operational fluctuation in Table 1. They are sometimes li
27、sted in separate columns. The set point is thetarget condition for the sensor used at the operational control point as programmed by the user. Operational fluctuations are deviations from the indicated set point at thecontrol point indicated by the readout of the calibrated control sensor during equ
28、ilibrium operation and do not include measurement uncertainty. At the operational controlpoint, the operational fluctuation can exceed no more than the listed value at equilibrium. Therefore, when a standard calls for a particular set point, the user programsthat exact number. The operational fluctu
29、ations specified with the set point do not imply that the user is allowed to program a set point higher or lower than the exact setpoint specified.D Unless otherwise indicated, black panel temperatures apply during the light-only portion of the cycle. The equilibrium black panel temperature is obtai
30、ned without a sprayperiod. For light intervals less than 30 min, the black panel temperature might not reach equilibrium.E Typical uses do not imply that results from exposures of these materials according to the cycle described will correlate to those from actual use conditions.D Unless otherwise s
31、pecified, water spray refers to water sprayed on the exposed surfaces of the test specimens.F Historical convention has established this as a very commonly used test cycle. This cycle may not adequately simulate the effects of outdoor exposure.G Unless otherwise specified, water spray refers to wate
32、r sprayed on the exposed surfaces of the test specimens.D5031/D5031M 132D1400 Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to aNonferrous Metal Base (Withdrawn 2006)3D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely
33、-Illuminated Opaque MaterialsD1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for PaintingD2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color CoordinatesD2616 Test Method for Evaluation of Visual Color Difference With a G
34、ray ScaleD3361D3361/D3361M Practice for Unfiltered Open-Flame Carbon-Arc Exposures of Paint and Related CoatingsD3980 Practice for Interlaboratory Testing of Paint and Related Materials (Withdrawn 1998)3D4214 Test Methods for Evaluating the Degree of Chalking of Exterior Paint FilmsD5870 Practice fo
35、r Calculating Property Retention Index of PlasticsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test MethodE1347 Test Method for Color and Color-Difference Measurement by Tristimulus ColorimetryG23 Practice for Operating Light-ExposureApparatus (Carbon-Arc Typ
36、e) With and Without Water for Exposure of NonmetallicMaterials (Withdrawn 2000)3G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testing of Nonmetallic MaterialsG147 Practice for Conditioning and Handling o
37、f Nonmetallic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light SourcesG152 Practice for Operating Open Flame Carbon Arc Light Apparatus for Exposure of Nonmetallic MaterialsG153 Practice for Op
38、erating Enclosed Carbon Arc Light Apparatus for Exposure of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods to Weathering Tests3. Terminology3.1 The definitions given in Terminology G113 are applicable to this practice.4. Significance and Use4.1 The ability of a paint or
39、 coating to resist deterioration of its physical and optical properties caused by exposure to light, heat,and water can be very significant for many applications. This practice is intended to induce property changes associated withend-use conditions, including the effects of sunlight, moisture, and
40、heat. The exposure used in this practice is not intended tosimulate the deterioration caused by localized weather phenomena such as atmospheric pollution, biological attack, and saltwaterexposure.4.2 CautionsVariation in results may be expected when different operating conditions are used. Therefore
41、, no reference to theuse of this practice shall be made unless accompanied by a report prepared according to Section 10 that describes the specificoperating conditions used. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtainedaccording to this practice
42、.NOTE 2Additional information on sources of variability and on strategies for addressing variability in the design, execution, and data analysis oflaboratory accelerated exposure tests is found in Guide G141.4.2.1 The spectral power distribution of light from an enclosed carbon arc is significantly
43、different from that produced in lightand water exposure devices using other carbon-arc configurations or other light sources. The type and rate of degradation and theperformance rankings produced by exposures to enclosed carbon arcs can be much different from those produced by exposures toother type
44、s of laboratory light sources.4.2.2 Interlaboratory comparisons are valid only when all laboratories use the same type of carbon arc, filters, and exposureconditions.4.3 Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluatedin term
45、s of performance ranking compared to other materials or to a control.4,5 Therefore, exposure of a similar material of knownperformance (a control) at the same time as the test materials is strongly recommended. It is recommended that at least threereplicates of each material be exposed to allow for
46、statistical evaluation of results.4.4 Test results will depend upon the care that is taken to operate the equipment according to Practice G153. Significant factorsinclude regulation of line voltage, freedom from salt or other deposits from water, temperature and humidity control, andconditions of th
47、e electrodes.4.5 All references to exposures in accordance with this practice must include a complete description of the test cycle used.4 Fischer, R., “Results of Round-Robin Studies of Light- and Water-Exposure Standard Practices,” Accelerated and Outdoor Durability Testing of Organic Materials,AS
48、TM STP 1202, ASTM, 1993.5 Ketola, W., and Fischer, R., “Characterization and Use of Reference Materials in Accelerated Durability Tests,” VAMAS Technical Report No. 30, NIST, June 1997.D5031/D5031M 1335. Apparatus5.1 Use enclosed carbon-arc apparatus that conforms to the requirements defined in Prac
49、tices G151 and G153.5.2 Unless otherwise specified, the spectral power distribution of the enclosed carbon arc shall conform to the requirements inPractice G153 for the enclosed carbon arc.6. Hazards6.1 WarningIn addition to other precautions, never look directly at the carbon arc because UV radiation can damage the eye.Most carbon-arc machines are equipped with door safety switches, but users of old equipment must be certain to turn off the powerto the carbon arc before opening the test
