ASTM D6777-2002 Standard Test Method for Relative Rigidity of Poly(Vinyl Chloride)(PVC) Siding《聚氯乙烯挡板相对硬度的标准试验方法》.pdf

1、Designation: D 6777 02An American National StandardStandard Test Method forRelative Rigidity of Poly(Vinyl Chloride)(PVC) Siding1This standard is issued under the fixed designation D 6777; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi

2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 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 var

4、iables.1.2 Vinyl siding with higher rigidity should be easier tohandle and install. It is expected to provide a straighterappearance when installed on walls which have an unevensurface.1.3 All other vinyl siding requirements and test methods canbe identified through Specification D 3679.1.4 There is

5、 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 applica-bility of regulator

6、y limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics and ElectricalInsulation2D 883 Terminology Relating to Plastics2D 1600 Terminology for Abbreviated Terms Relating toPlastics2D 3679 Specification for Rigid Poly(Vinyl Chloride)(PVC)Siding2D

7、5947 Test Methods for Physical Dimensions of SolidPlastics Test Specimens23. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D 883 and D 1600 unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 relative rigidity (of PVC siding)stiffness of a

8、pieceof 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 speci

9、men 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.

10、5. Significance and Use5.1 Vinyl siding with higher rigidity should be easier toinstall and is expected to provide a straighter appearance wheninstalled on walls having an uneven surface.5.2 The rigidity of vinyl siding is believed to be controlledprimarily its characteristic configuration and is no

11、t believed tobe significantly influenced by manufacturing variables. Sidingweight can be shown to have little influence on this test.6. Interferences6.1 The supporting table and floor must be parallel and levelwith each other. A deviation greater than 0.20 in. between thetwo can affect test results.

12、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 willextend shall not have a radius more

13、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.7.2 A weight consisting ofa5lbsand bag is used to hold theend of the siding specimen firmly against the table top. Theweight

14、shall be as wide as the widest siding specimen to betested.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved March 10, 2002. Published May 2002.2Annual Book of ASTM

15、 Standards,Vol1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 A line shall be drawn on the table to ensuring that thespecimens are positioned perpendicular to the edge of the table.This line shall be drawn as a perpendicular to t

16、he 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 thefloor to the table top and the suspended end of the sidingspecimen. This ruler needs to be at least one inch lo

17、nger thanthe height of the table, and shall be scribed to allow measure-ments to the nearest116 in. It is recommended that the end ofthe ruler that will be placed against the floor be protected witha metal cap, etc. to ensure against abrasive wear.7.5 A tape measure is used to measure the length of

18、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 be taken from a vinyl sidingpanel complying with Specification D 3679. The siding panelas tes

19、ted 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 Specification D 3679 section 6.3.The specimen shall be cut so that there are no notches on

20、 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 of flatness and levelness as described in9.2-9.4 shall be performed before running the te

21、st.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 straightedge.9.3 A spirit level, at least 50 in. long shall be used to verifythat the table and floor

22、are each level. Over the length of thespirit level, a deviation of less 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 straightedg

23、eextends perpendicular over the table edge. Place the weightfrom 7.2 on 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 measuremen

24、tsshall not differ by more than 0.20 in.9.5 If necessary to correct the 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 condit

25、ioning the specimen shall rest on a flat surfacethat supports the specimen 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.

26、 Using a tape measure, make a mark 50 6116in. from this unsupported end.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 wit

27、h the 50 in. markdirectly over the table edge.11.3 Place the weight described 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 th

28、e specimen. After positioning the weight verify onceagain that the position 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

29、 theunsupported end of the specimen to the floor. Make onemeasurement at 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 flo

30、or,to the nearest116 in. Average these two values and record thisaverage 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 edgewhe

31、re the specimen extends. Record this “table height” value.12. Calculation 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.”

32、 Report the “rigidity index” and all individualmeasurements, along with an identification of the sample.NOTE 1The “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 per

33、centage. Due to thesample length designated in this procedure, the “percent rigidity” simpli-fies to 100 minus the deflection value in inches, as shown below.100 3100 2 deflection!specimen length5 100 3100 2 deflection!1005 100 2 deflection13. Report13.1 The report shall include the following:13.1.1

34、 Complete identification of sample tested,13.1.2 Mean specimen height values and their average,13.1.3 Table height,13.1.4 Sample deflection, and13.1.5 Rigidity index.D677702214. Precision and Bias14.1 Table 1 is based on an interlaboratory study conductedin 2000 involving 15 materials tested by seve

35、n laboratories.Similar commercial materials were received from severalmajor 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.

36、14.1.2 Sr is the within laboratory standard deviation of themean. r is the 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.

37、NOTE 2The explanations of r and R are only intended to present ameaningful 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

38、be representative of other lots or formulations.Users of this test method should apply the principles outlined in E 691 togenerate data specific to their materials and laboratory.14.2 BiasSince no absolute test method exists for com-parison, no bias statement can be presented for this testmethod.15.

39、 Keywords15.1 PVC siding; rigidity; rigidity indexFIG. 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 2.55D5V1 94.08 0.67 0.89 1.90 2.52D4DL2 92.16 0.29 0.79

40、 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 0.42 2.01D5H3 96.01 0.38 0.71 1.08 2.01D5L1 91.17 0.19

41、0.99 0.54 2.80D6777023ASTM International takes no position respecting the validity of any patent rights asserted in connection 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 infringeme

42、nt of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or

43、for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration 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 kno

44、wn to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6777024