1、Designation: D5722 08D5722 14Standard Practice forPerforming Accelerated Outdoor Weathering of Factory-Coated Embossed Hardboard Using Concentrated NaturalSunlight and a Soak-Freeze-Thaw Procedure1This standard is issued under the fixed designation D5722; the number immediately following the designa
2、tion indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*Scope1.1 This practice covers techni
3、ques to accelerate weathering effects of factory-coated embossed hardboard using Cycle 1 ofPractice G90 (concentrated natural sunlight with periodic surface water spray) plus a soak-freeze thaw cycle (see Section 5 of thispractice).1.2 Testing by use of the methods described in this practice may be
4、employed in the qualitative assessment of weathering effects.The relative durability of coated hardboards may be best determined by comparison of their test results with those of controlspecimens derived from real time exposure test experience.1.3 The values stated in either SI units or inch-pound u
5、nits are to be regarded separately as the standard. The values given inparentheses are for information only. stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with th
6、e 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 the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Ref
7、erenced Documents2.1 ASTM Standards:2D660 Test Method for Evaluating Degree of Checking of Exterior PaintsD661 Test Method for Evaluating Degree of Cracking of Exterior PaintsD662 Test Method for Evaluating Degree of Erosion of Exterior PaintsD772 Test Method for Evaluating Degree of Flaking (Scalin
8、g) of Exterior PaintsD4214 Test Methods for Evaluating the Degree of Chalking of Exterior Paint FilmsG90 Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural SunlightG113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetal
9、lic MaterialsG169 Guide for Application of Basic Statistical Methods to Weathering Tests3. Terminology3.1 The terminology used in this practice is defined in Terminology G113.3.2 Definitions:3.2.1 hardboard, ngeneric term for a panel manufactured primarily from inter-felted lignocellulosic fibers (u
10、sually wood),consolidated under heat and pressure in a hot press to a density of 0.50 g/cm500 kg/m3 (31 lb/ft3) or greater and to which othermaterials may have been added during manufacture to improve certain properties.3.2.2 embossed hardboard, nhardboard that is manufactured with a textured surfac
11、e.3.2.2.1 Discussion1 This practice is under the 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 July 1, 2008Dec. 1, 2014. Published July 2008January 2
12、015. Originally approved in 1995. Last previous edition approved in 20032008 asD5722 03.D5722 08. DOI: 10.1520/D5722-08.10.1520/D5722-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume in
13、formation, refer to the standardsstandards Document Summary page on the ASTM website.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. Becauseit may not be technically possible to a
14、dequately 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 section appears at the end of this standardCopyright AS
15、TM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Wood-like and stucco patterns are examples of typical embossed hardboard surfaces.4. Summary of Practice4.1 This practice is used to accelerate long-term weathering effects by subjecting the samples
16、 to concentrated natural sunlight(with periodic daytime surface water spray) plus a soak-freeze-thaw cycle.4.2 This practice has been useful in accelerating finish failure involving loss of film integrity, such as cracking, peeling, andflaking of factory-coated embossed hardboard.5. Significance and
17、 Use5.1 The ability to quickly and accurately evaluate and predict long-term weathering performance of factory-applied coatings isof paramount importance in making sound business and technical decisions.5.2 It is important to include control specimens of known field performance to determine the effi
18、cacy of this practice for specificsubstrate(s) and coating system(s). These control specimens may include materials known to possess acceptable and unacceptablefield performance for the defect(s) under consideration.5.3 Results derived from this practice are best used to compare the relative perform
19、ance of materials tested at the same timein the same device.5.4 The inclusion of control specimens and their resulting data will assist in dealing with test variability caused by seasonal orannual variations in important climatic factors.5.5 Extensive research was performed during the development of
20、 this standard practice. This research showed that this practiceis not useful for determination of quantitative acceleration factors. However, this test is very useful as a comparative test.5.6 A minimum of two replicates for both control specimens and test specimens is recommended to allow statisti
21、cal evaluationof results. Refer to Practice G169 for additional guidance on establishing the number of replicates.6. Apparatus and Materials6.1 Test Machines, as illustrated in a figure titled “Schematic of a Fresnel Reflecting Concentrator Accelerated WeatheringMachine” of Practice G90 and describe
22、d in Apparatus Section of Practice G90.6.2 Freezer, capable of maintaining a temperature of 20 6 5C (4 6 9F). The freezer shall be equipped with a thermocoupleto monitor air temperature.6.3 Mounting Board, paper-faced marine grade wood structural panel, surface routed to accept the test specimens du
23、ringexposure (see Fig. 1).7. Test Specimens7.1 Recommended specimen size is 5 by 13 by maximum 1.3 cm 50 mm by 130 mm by maximum 13 mm thick (2 by 5 bymaximum 12 in.). in. thick).7.2 Attach the specimen to the mounting board. One method to accomplish this is to apply exterior grade silicone adhesive
24、 tothe center of each specimen. Use cotton gloves to press the specimen into the mounting plate. Other mounting techniques, agreedupon between the testing laboratory and the client are possible.7.3 Useful results have been achieved when specimen edges and backs remain unsealed.8. Procedures8.1 One p
25、rocedure recommended is in Practice G90.8.2 Soak-Freeze-Thaw Procedure : Procedure:8.2.1 Following daily exposure in the Fresnel reflecting concentrator accelerated weathering machine in Practice G90, Cycle 1,the mounting plate with specimens is removed and immersed in a deionized water soak tank ma
26、intained at 25 6 5C (77 6 9F)for at least 1 h but not more than 1 h 15 min. If the board containing specimens floats in the immersion tank, the board may haveto be inserted upside down for the specimens to be completely immersed in water. A minimum exposure of 1 MJ/m2 of ultravioletradiation as meas
27、ured per Practice G90 constitutes a daily cycle. If a minimum of 1 MJ/m2 of ultraviolet radiation (295 to 385 nm)is not accumulated in one day of exposure, the specimens are to be left on the apparatus and are not to be immersed or frozen thatday. This exposure day does not constitute one test cycle
28、. Continue with the exposure the following morning.8.2.2 After soak, the plate with specimens is placed for a minimum of 12 h and a maximum of 15 h in a freezer maintainedat 20 6 5C (4 6 9F). The following morning, allow the samples to thaw for a minimum of 1 h under laboratory ambientconditions.NOT
29、E 1Because the start of the accelerated weathering after thawing can be delayed due to weather, the precise time of the thaw portion of the cyclecannot be specified.D5722 1428.2.3 The plate with specimens is remounted on the exposure device as prescribed in Practice G90.8.2.4 The completion of 8.2.1
30、, 8.2.2, and 8.2.3 constitutes one test cycle. Report test results after 30 cycles or other agreed upontime period.8.2.5 At least every week, replace the water used for soaking test panels with new deionized water.9. Test Evaluation9.1 Applicable criteria for weathering evaluation may include, but a
31、re not limited to, the following test methods: chalking (TestMethods D4214), checking (Test Method D660), cracking (Test Method D661), discoloration, erosion (Test Method D662), facefiber swelling, flaking (Test Method D772), and intercoat adhesion.9.2 Testing laboratory and client shall agree upon
32、evaluation criteria, using applicable standards, and evaluation frequency.9.3 The use of control specimens for specific weathering criteria is strongly suggested.9.4 Initial pre-exposure inspection of all samples must be conducted to document any pre-existing surface imperfection.10. Report10.1 Repo
33、rt the following information:10.1.1 A record of the type and identification of the product tested,10.1.2 Method used,10.1.3 Rating, if applicable,10.1.4 Other pertinent information must be shown on the inspection report for each evaluation,10.1.5 Date of inspection,10.1.6 Date of exposure start,10.1
34、.7 Method of exposure (Practice D5722),10.1.8 Total solar radiant exposure, MJ/m2,FIG. 1 Routed Specimen Mounting Board Showing Placement of SpecimensD5722 14310.1.9 Ultra-violet radiant exposure (UV) (295 to 385 nm), MJ/m2,10.1.10 Number of cycles, and10.1.11 Any comments felt to be relevant to the
35、 exposure or the test results.11. Keywords11.1 accelerated weathering; factory coatings (hardboard); film integrity; hardboard (composition board siding)SUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue (D5722 - 03)that may impact t
36、he use of this standard. (Approved July 1, 2008.)(1) Section 1slight changes were made to the wording in the Scope.(2) Section 5changes were made in Significance and Use regarding changing the term “reference specimens” to “controlspecimens.” A sentence regarding quantitative service life approximat
37、ions was deleted from 5.4. A subsection was added (5.5) toindicate that even though this was not to be used for quantitative service life predictions, it was useful as a comparative test.(3) Section 6the freezer requirement was changed from 18 6 3C to 20 6 5C.(4) Section 7slight changes were made in
38、 the recommended mounting procedure.(5) Subsection 8.2changes were made in the soak portion of the test cycle, changing the soak duration from a precise time ofone hour to a range which extends from one hour to one hour and fifteen minutes. Also in Subsection 8.2, the freezing durationwas changed fr
39、om a precise time of 12 hours to a range which extends from 12 hours to 15 hours. The soak temperature waschanged from 21 6 3C to 25 6 5C. The freezing temperature was changed from 18 6 3C to 20 6 5C. A requirement wasadded to change the soak water at least every week.(6) Section 9the phrase “pass-f
40、ail reference” was changed to “control.”(7) Section 10minor changes were made to the report requirements.(8) Section 11 Precision and Bias was deleted from this standard.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
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