1、Designation: D6777 16 An American National StandardStandard Test Method forRelative Rigidity of Poly(Vinyl Chloride)(PVC) Siding1This standard is issued under the fixed designation D6777; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, 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*1.1 This procedure describes a method to determine anumerical value indicating the relative rigidity or
3、stiffness ofvinyl siding panels. This procedure is not intended for routinequality control inspection during the manufacture of vinylsiding. The rigidity of vinyl siding is believed to be controlledprimarily by its configuration and is not believed to besignificantly influenced by manufacturing vari
4、ables.1.2 Vinyl siding with higher rigidity is often easier to handleand install than siding of lower rigidity. It is expected toprovide a straighter appearance when installed on walls havingan uneven surface.1.3 All other vinyl siding requirements and test methods canbe identified through Specifica
5、tion D3679.1.4 There is no known ISO equivalent to this standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the appl
6、ica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1600 Terminology for Abbreviated Terms Relating to Plas-ticsD3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)Si
7、dingD5947 Test Methods for Physical Dimensions of SolidPlastics Specimens3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D883 and D1600 unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 relative rigidity (of PVC siding)stiffness of a pie
8、ceof vinyl siding.3.2.2 rigidity index (of PVC siding)amount of sample sagor deflection relative to sample length. The “rigidity index” isdefined as 100 minus the deflection value, divided by thesample length, expressed as a percentage.4. Summary of Test Method4.1 In this procedure the test specimen
9、 is a piece of vinylsiding 100 in. long. This specimen is placed on top of a leveltable with 50 in. of the specimen extending unsupported pastthe edge of the table, allowing the specimen to sag under itsown weight. The amount of sag that occurs is used to calculatea rigidity index for the sample.5.
10、Significance and Use5.1 Vinyl siding with higher rigidity is often easier to installthan siding with lower rigidity and expected to provide astraighter appearance when installed on walls having anuneven surface.5.2 The rigidity of vinyl siding is believed to be controlledprimarily its characteristic
11、 configuration and is not believed tobe significantly influenced by manufacturing variables. Sidingweight has little influence on this test.6. Interferences6.1 The supporting table and floor must be flat and level.Calibrations of flatness, parallelism, and levelness, as de-scribed in 9.2-9.4 shall b
12、e performed before running this test.7. Apparatus7.1 This procedure requires a table that is flat and level. Thetable must be at least 50 in. long and at least as wide as thewidest test specimen to be measured. The height of the table isnot critical. The edge of the table over which the specimen wil
13、lextend shall not have a radius more than 0.125 in. The tablemust be positioned on a hard surface or floor (no carpet) that isalso flat and level over a length extending at least 50 in. fromthe edge of the table.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the
14、direct responsibility of Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved May 1, 2016. Published May 2016. Originallyapproved in 2002. Last previous edition approved in 2010 as D6777 - 02(2010)1.DOI:10.1520/D6777-16.2For referenced ASTM standards, visit the ASTM website, www.
15、astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO
16、Box C700, West Conshohocken, PA 19428-2959. United States17.2 Aweight consisting ofa5lbsand bag is used to hold theend of the siding specimen firmly against the table top. Theweight shall be as wide as the widest siding specimen to betested.7.3 A line shall be drawn on the table to ensuring that the
17、specimens are positioned perpendicular to the edge of the table.This line shall be drawn as a perpendicular to the edge using alarge framing square at least 10 in. on each side.7.4 A rigid ruler (such as a folding carpenters ruler or largemetal framing square) is used to measure the distance from th
18、efloor to the table top and the suspended end of the sidingspecimen. This ruler needs to be at least one inch longer thanthe height of the table, and shall be scribed to allow measure-ments to the nearest116 in.NOTE 1It is recommended that the end of the ruler being placedagainst the floor be protec
19、ted with a cap to prevent abrasive wear.7.5 A tape measure is used to measure the length of thesiding specimen. This tape measure needs to be at least 101 in.long, and shall be scribed to allow measurements to the nearest116 in.8. Sampling, Test Specimens, and Test Units8.1 The test specimen shall b
20、e taken from a vinyl sidingpanel complying with Specification D3679. The siding panel astested shall be complete with any weep holes or nail slots asrequired for installation per the manufacturers design. Thespecimen shall be cut to a length of 100 6 0.25 in. as measuredaccording to the procedure in
21、 Specification D3679 section 6.3.The specimen shall be cut so that there are no notches on theend which will extend off the table. Both ends of the specimenshall be cut squarely, being no more than18 in. out of squareacross the width of the specimen.9. Calibration and Standardization9.1 Calibrations
22、 of flatness, levelness, and parallelism asdescribed in 9.2 9.4 shall be performed before running thetest.9.2 The flatness of the floor and table shall each be verifiedusing a straightedge at least 50 in. long. At no point shall thetable top or floor deviate more than 0.20 in. from the surface ofthe
23、 straightedge. Evaluate the flatness of the floor in the areawhere the sag is measured, from the edge of the table to theedge of the sample.9.3 A spirit level, at least 50 in. long shall be used to verifythat the table and floor are each level. Over the length of thespirit level, a deviation of less
24、 than 0.2 in. is consideredinsignificant.9.4 After verifying the flatness and level of both the tableand the floor, verify them in combination. Place a straightedge96 to 100 in. long on the table so that 50 in. of the straightedgeextends perpendicular over the table edge. Place the weightfrom 7.2 on
25、 the table end of the straightedge to hold it flat.Measure the distance from the straightedge to the floor at twopoints: at the unsupported end of the straightedge and imme-diately adjacent to the table edge. These two measurementsshall not differ by more than 0.20 in.9.5 If necessary to correct the
26、 level of the table, shims canbe permanently attached to the bottom of the table legs.10. Conditioning10.1 Prior to testing, condition the test specimen for aminimum of 24 h at a temperature of 73.4F 6 3.6 (20C 6 2).During conditioning the specimen shall rest on a flat surfacethat supports the speci
27、men over its entire length.11. Procedure11.1 Select one (unnotched) end of the specimen to be theend that will extend off the table. Label this end of thespecimen to avoid subsequent confusion about which end is tobe unsupported. Using a tape measure, make a mark 50 6116in. from this unsupported end
28、.11.2 Place the specimen face up (the face is the side that isexposed after installation) on the table so that the specimen isperpendicular to the edge of the table (parallel to the perpen-dicular line drawn on the table) and with the 50 in. markdirectly over the table edge.11.3 Place the weight des
29、cribed in 7.2 on the supported endof the specimen (the end on the table). The edge of the weightfurthest from the supported end shall be 6 6 0.5 in. from thesupported end (see Fig. 1). The weight shall cover the entirewidth of the specimen.After positioning the weight verify onceagain that the posit
30、ion of the specimen is as described in 11.2.The panel shall be allowed to bow upwards between the weightand the table edge.11.4 Three minutes 6 15 seconds after positioning thesample as described above, measure the distance from theunsupported end of the specimen to the floor. Make onemeasurement at
31、 each edge of the specimen. Each measurementshall be from the floor to a portion on the panel cross-sectionthat is in contact with the table. These measurements shall bemade with a rigid ruler maintained perpendicular to the floor,to the nearest116 in. Average these two values and record thisaverage
32、 as the “mean specimen height.”11.5 Run three replicates and average the three “meanspecimen height” values.11.6 Use the ruler to measure to the nearest116 in. thedistance from the table top to the floor, adjacent to the edgewhere the specimen extends. Record this “table height” value.12. Calculatio
33、n or Interpretation of Results12.1 Subtract the average of the three “mean specimenheights” from the “table height” to obtain the “sample deflec-tion.”12.2 Subtract the “sample deflection” from 100 to obtain the“rigidity index.” Report the “rigidity index” and all individualmeasurements, along with
34、an identification of the sample.NOTE 2The “rigidity index” expresses the sample sag relative to thesample length. The “rigidity index” is defined as 100 minus the deflectionvalue, divided by the sample length, expressed as a percentage. Due to thesample length designated in this procedure, the “perc
35、ent rigidity” simpli-fies to 100 minus the deflection value in inches, as shown below.D6777 162100 3100 2 deflection!specimen length5 100 3100 2 deflection!1005 1002 deflection13. Report13.1 The report shall include the following:13.1.1 Complete identification of sample tested,13.1.2 Mean specimen h
36、eight values and their average,13.1.3 Table height,13.1.4 Sample deflection, and13.1.5 Rigidity index.14. Precision and Bias14.1 Table 1 is based on an interlaboratory study conductedin 2000 involving 15 materials tested by seven laboratories.Similar commercial materials were received from severalma
37、jor siding producers, and coded by the organizing lab. Allmaterials were tested by each laboratory in an as receivedcondition.14.1.1 In Table 1 for the materials indicated, mean valueswere derived from triplicate determinations.14.1.2 Sr is the within laboratory standard deviation of themean. r is t
38、he within laboratory critical interval between twotest results and r = 2.83 Sr.14.1.3 SR is the between laboratory standard deviation ofthe mean. R is the between laboratory critical interval betweentest results and R = 2.83 SR.NOTE 3The explanations of r and R are only intended to present ameaningf
39、ul way of considering the approximate precision of this testmethod. The data in Table 1 should not be applied to acceptance ofrejection of materials as these data apply only to the materials tested in theround robin and may not be representative of other lots or formulations.Users of this test metho
40、d should apply the principles outlined in E691 togenerate data specific to their materials and laboratory.FIG. 1 Testing Apparatus for Rigidity of Vinyl SidingTABLE 1 Precision and Bias DataMaterials Mean Sr SR r RD4DL1 91.68 0.44 0.74 1.25 2.09D5H1 93.51 0.29 0.73 0.82 2.07D5H2 85.84 0.74 0.90 2.09
41、 2.55D5V1 94.08 0.67 0.89 1.90 2.52D4DL2 92.16 0.29 0.79 0.82 2.24D5H3 93.34 0.48 0.84 1.36 2.38D5V2 86.32 0.28 0.94 0.79 2.66D4DL2 90.85 0.26 0.80 0.74 2.26D4DL3 96.12 0.10 0.63 0.28 1.78D4DL4 92.85 0.10 0.75 0.28 2.12D5H3 87.71 0.84 1.25 2.38 3.54D5V3 91.07 0.20 0.68 0.57 1.92D4DL2 91.48 0.15 0.71
42、 0.42 2.01D5H3 96.01 0.38 0.71 1.08 2.01D5L1 91.17 0.19 0.99 0.54 2.80D6777 16314.2 BiasSince no absolute test method exists forcomparison, no bias statement can be presented for this testmethod.15. Keywords15.1 PVC siding; rigidity; rigidity indexSUMMARY OF CHANGESCommittee D20 has identified the l
43、ocation of selected changes to this standard since the last issue(D6777 - 02(2010)1) that may impact the use of this standard. (May 1, 2016)(1) Modified 1.2, 5.1, and 6.1, 9.1, and 9.2 for clarity.ASTM International takes no position respecting the validity of any patent rights asserted in connectio
44、n with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible
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46、eration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Bar
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