1、Designation: D6777 02 (Reapproved 2010)1D6777 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 adopti
2、on 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 NOTEReapproved with editorial changes throughout in November 2010.1. Scope*1.1 This
3、procedure describes a method to determine a numerical value indicating the relative rigidity or stiffness of vinyl sidingpanels. This procedure is not intended for routine quality control inspection during the manufacture of vinyl siding. The rigidityof vinyl siding is believed to be controlled prim
4、arily by its configuration and is not believed to be significantly influenced bymanufacturing variables.1.2 Vinyl siding with higher rigidity is often easier to handle and install. install than siding of lower rigidity. It is expected toprovide a straighter appearance when installed on walls having
5、an uneven surface.1.3 All other vinyl siding requirements and test methods can be identified through Specification D3679.1.4 There is no known ISO equivalent to this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsi
6、bilityof 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:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1600 Termi
7、nology for Abbreviated Terms Relating to PlasticsD3679 Specification for Rigid Poly(Vinyl Chloride) (PVC) SidingD5947 Test Methods for Physical Dimensions of Solid Plastics Specimens3. Terminology3.1 DefinitionsDefinitions are in accordance with Terminology D883 and D1600 unless otherwise indicated.
8、3.2 Definitions of Terms Specific to This Standard:3.2.1 relative rigidity (of PVC siding)stiffness of a piece of vinyl siding.3.2.2 rigidity index (of PVC siding)amount of sample sag or deflection relative to sample length. The “rigidity index” isdefined as 100 minus the deflection value, divided b
9、y the sample length, expressed as a percentage.4. Summary of Test Method4.1 In this procedure the test specimen is a piece of vinyl siding 100 in. long. This specimen is placed on top of a level tablewith 50 in. of the specimen extending unsupported past the edge of the table, allowing the specimen
10、to sag under its own weight.The amount of sag that occurs is used to calculate a rigidity index for the sample.5. Significance and Use5.1 Vinyl siding with higher rigidity is often easier to install than siding with lower rigidity and expected to provide a straighterappearance when installed on wall
11、s having an uneven surface.1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.24 on Plastic Building Products.Current edition approved Nov. 15, 2010May 1, 2016. Published March 2011May 2016. Originally approved in 2002.
12、 Last previous edition approved in 20022010 asD6777 - 02.D6777 - 02(2010)1 DOI:10.1520/D6777-02R10E01 DOI:10.1520/D6777-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, ref
13、er to the standards 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 adequately depict all ch
14、anges 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 ASTM International, 100 B
15、arr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 The rigidity of vinyl siding is believed to be controlled primarily its characteristic configuration and is not believed to besignificantly influenced by manufacturing variables. Siding weight has little influence on
16、this test.6. Interferences6.1 The supporting table and floor must be parallel and level with each other. Calibrations of flatness flat and level. Calibrationsof flatness, parallelism, and levelness, as described in 9.2-9.4 shall be performed before running this test.7. Apparatus7.1 This procedure re
17、quires a table that is flat and level. The table must be at least 50 in. long and at least as wide as the widesttest specimen to be measured. The height of the table is not critical. The edge of the table over which the specimen will extendshall not have a radius more than 0.125 in. The table must b
18、e positioned on a hard surface or floor (no carpet) that is also flat andlevel over a length extending at least 50 in. from the edge of the table.7.2 Aweight consisting of a 5 lb sand bag is used to hold the end of the siding specimen firmly against the table top. The weightshall be as wide as the w
19、idest siding specimen to be tested.7.3 A line shall be drawn on the table to ensuring that the specimens are positioned perpendicular to the edge of the table. Thisline shall be drawn as a perpendicular to the edge using a large framing square at least 10 in. on each side.7.4 A rigid ruler (such as
20、a folding carpenters ruler or large metal framing square) is used to measure the distance from thefloor to the table top and the suspended end of the siding specimen. This ruler needs to be at least one inch longer than the heightof the table, and shall be scribed to allow measurements to the neares
21、t 116 in.NOTE 1It is recommended that the end of the ruler being placed against the floor be protected with a cap to prevent abrasive wear.7.5 A tape measure is used to measure the length of the siding specimen. This tape measure needs to be at least 101 in. long,and shall be scribed to allow measur
22、ements to the nearest 116 in.8. Sampling, Test Specimens, and Test Units8.1 The test specimen shall be taken from a vinyl siding panel complying with Specification D3679. The siding panel as testedshall be complete with any weep holes or nail slots as required for installation per the manufacturers
23、design. The specimen shallbe cut to a length of 100 6 0.25 in. as measured according to the procedure in Specification D3679 section 6.3. The specimen shallbe cut so that there are no notches on the end which will extend off the table. Both ends of the specimen shall be cut squarely,being no more th
24、an 18 in. out of square across the width of the specimen.9. Calibration and Standardization9.1 Calibrations of flatness flatness, levelness, and levelnessparallelism as described in 9.2 9.4 shall be performed beforerunning the test.9.2 The flatness of the floor and table shall each be verified using
25、 a straightedge at least 50 in. long. At no point shall the tabletop or floor deviate more than 0.20 in. from the surface of the straightedge. Evaluate the flatness of the floor in the area where thesag is measured, from the edge of the table to the edge of the sample.9.3 A spirit level, at least 50
26、 in. long shall be used to verify that the table and floor are each level. Over the length of the spiritlevel, a deviation of less than 0.2 in. is considered insignificant.9.4 After verifying the flatness and level of both the table and the floor, verify them in combination. Place a straightedge 96
27、to100 in. long on the table so that 50 in. of the straightedge extends perpendicular over the table edge. Place the weight from 7.2on the table end of the straightedge to hold it flat. Measure the distance from the straightedge to the floor at two points: at theunsupported end of the straightedge an
28、d immediately adjacent to the table edge. These two measurements shall not differ by morethan 0.20 in.9.5 If necessary to correct the level of the table, shims can be permanently attached to the bottom of the table legs.10. Conditioning10.1 Prior to testing, condition the test specimen for a minimum
29、 of 24 h at a temperature of 73.4F 6 3.6 (20C 6 2). Duringconditioning the specimen shall rest on a flat surface that supports the specimen over its entire length.11. Procedure11.1 Select one (unnotched) end of the specimen to be the end that will extend off the table. Label this end of the specimen
30、 toavoid subsequent confusion about which end is to be unsupported. Using a tape measure, make a mark 50 6 116 in. from thisunsupported end.11.2 Place the specimen face up (the face is the side that is exposed after installation) on the table so that the specimen isperpendicular to the edge of the t
31、able (parallel to the perpendicular line drawn on the table) and with the 50 in. mark directly overthe table edge.D6777 16211.3 Place the weight described in 7.2 on the supported end of the specimen (the end on the table). The edge of the weightfurthest from the supported end shall be 6 6 0.5 in. fr
32、om the supported end (see Fig. 1). The weight shall cover the entire widthof the specimen.After positioning the weight verify once again that the position of the specimen is as described in 11.2. The panelshall be allowed to bow upwards between the weight and the table edge.11.4 Three minutes 6 15 s
33、econds after positioning the sample as described above, measure the distance from the unsupportedend of the specimen to the floor. Make one measurement at each edge of the specimen. Each measurement shall be from the floorto a portion on the panel cross-section that is in contact with the table. The
34、se measurements shall be made with a rigid rulermaintained perpendicular to the floor, to the nearest 116 in.Average these two values and record this average as the “mean specimenheight.”11.5 Run three replicates and average the three “mean specimen height” values.11.6 Use the ruler to measure to th
35、e nearest 116 in. the distance from the table top to the floor, adjacent to the edge where thespecimen extends. Record this “table height” value.12. Calculation or Interpretation of Results12.1 Subtract the average of the three “mean specimen heights” from the “table height” to obtain the “sample de
36、flection.”12.2 Subtract the “sample deflection” from 100 to obtain the “rigidity index.” Report the “rigidity index” and all individualmeasurements, along with an identification of the sample.NOTE 2The “rigidity index” expresses the sample sag relative to the sample length. The “rigidity index” is d
37、efined as 100 minus the deflection value,divided by the sample length, expressed as a percentage. Due to the sample length designated in this procedure, the “percent rigidity” simplifies to 100minus the deflection value in inches, as shown below.10031002deflection!specimen length 510031002deflection
38、!100 51002deflection13. Report13.1 The report shall include the following:13.1.1 Complete identification of sample tested,FIG. 1 Testing Apparatus for Rigidity of Vinyl SidingD6777 16313.1.2 Mean specimen height values and their average,13.1.3 Table height,13.1.4 Sample deflection, and13.1.5 Rigidit
39、y index.14. Precision and Bias14.1 Table 1 is based on an interlaboratory study conducted in 2000 involving 15 materials tested by seven laboratories. Similarcommercial materials were received from several major siding producers, and coded by the organizing lab. All materials weretested by each labo
40、ratory in an as received condition.14.1.1 In Table 1 for the materials indicated, mean values were derived from triplicate determinations.14.1.2 Sr is the within laboratory standard deviation of the mean. r is the within laboratory critical interval between two testresults and r = 2.83 Sr.14.1.3 SR
41、is the between laboratory standard deviation of the mean. R is the between laboratory critical interval between testresults and R = 2.83 SR.NOTE 3The explanations of r and R are only intended to present a meaningful way of considering the approximate precision of this test method. Thedata in Table 1
42、 should not be applied to acceptance of rejection of materials as these data apply only to the materials tested in the round robin and maynot be representative of other lots or formulations. Users of this test method should apply the principles outlined in E691 to generate data specific to theirmate
43、rials and laboratory.14.2 BiasSince no absolute test method exists for comparison, no bias statement can be presented for this test method.15. Keywords15.1 PVC siding; rigidity; rigidity indexSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the l
44、ast issue(D6777 - 02(2010)1) that may impact the use of this standard. (November 15, 2010)(May 1, 2016)(1) Cleaned up language in Modified 1.2, 5.1, 1.2and 5.1. 6.1, 9.1, and 9.2 for clarity.(2) Removed non-mandatory language in 5.2.(3) Removed recommendation from 7.4. Inserted this text as Note 1.
45、Renumbered subsequent notes.TABLE 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 0.82 2.24D5H3 93.34 0.48 0.84 1.36 2.38D5V2 86.32 0.28 0.94 0.79 2.66D4DL2
46、 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 0.99 0.54 2.80D6777 164ASTM International takes no position respecting the
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