ASTM D6777-02
(Test Method)Standard Test Method for Relative Rigidity of Poly(Vinyl Chloride)(PVC) Siding
Standard Test Method for Relative Rigidity of Poly(Vinyl Chloride)(PVC) Siding
SIGNIFICANCE AND USE
Vinyl siding with higher rigidity should be easier to install and is expected to provide a straighter appearance when installed on walls having an uneven surface.
The rigidity of vinyl siding is believed to be controlled primarily its characteristic configuration and is not believed to be significantly influenced by manufacturing variables. Siding weight can be shown to have little influence on this test.
SCOPE
1.1 This procedure describes a method to determine a numerical value indicating the relative rigidity or stiffness of vinyl siding panels. This procedure is not intended for routine quality control inspection during the manufacture of vinyl siding. The rigidity of vinyl siding is believed to be controlled primarily by its configuration and is not believed to be significantly influenced by manufacturing variables.
1.2 Vinyl siding with higher rigidity should be easier to handle and install. It is expected to provide a straighter appearance when installed on walls which have an uneven surface.
1.3 All other vinyl siding requirements and test methods can be identified through Specification D 3679.
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 responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:D6777–02
Standard Test Method for
Relative Rigidity of Poly(Vinyl Chloride)(PVC) Siding
This standard is issued under the fixed designation D6777; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Definitions of Terms Specific to This Standard:
3.2.1 relative rigidity (of PVC siding)—stiffness of a piece
1.1 This procedure describes a method to determine a
of vinyl siding.
numerical value indicating the relative rigidity or stiffness of
3.2.2 rigidity index (of PVC siding)—amount of sample sag
vinyl siding panels. This procedure is not intended for routine
or deflection relative to sample length. The “rigidity index” is
quality control inspection during the manufacture of vinyl
defined as 100 minus the deflection value, divided by the
siding. The rigidity of vinyl siding is believed to be controlled
sample length, expressed as a percentage.
primarily by its configuration and is not believed to be
significantly influenced by manufacturing variables.
4. Summary of Test Method
1.2 Vinyl siding with higher rigidity should be easier to
4.1 In this procedure the test specimen is a piece of vinyl
handle and install. It is expected to provide a straighter
siding 100 in. long. This specimen is placed on top of a level
appearance when installed on walls which have an uneven
table with 50 in. of the specimen extending unsupported past
surface.
the edge of the table, allowing the specimen to sag under its
1.3 All other vinyl siding requirements and test methods can
own weight. The amount of sag that occurs is used to calculate
be identified through Specification D3679.
a rigidity index for the sample.
1.4 There is no known ISO equivalent to this standard.
1.5 This standard does not purport to address all of the
5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 Vinyl siding with higher rigidity should be easier to
responsibility of the user of this standard to establish appro-
install and is expected to provide a straighter appearance when
priate safety and health practices and determine the applica-
installed on walls having an uneven surface.
bility of regulatory limitations prior to use.
5.2 The rigidity of vinyl siding is believed to be controlled
2. Referenced Documents primarily its characteristic configuration and is not believed to
2 be significantly influenced by manufacturing variables. Siding
2.1 ASTM Standards:
weight can be shown to have little influence on this test.
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
6. Interferences
D1600 Terminology for Abbreviated Terms Relating to
6.1 The supporting table and floor must be parallel and level
Plastics
with each other. A deviation greater than 0.20 in. between the
D3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)
two can affect test results.
Siding
D5947 Test Methods for Physical Dimensions of Solid
7. Apparatus
Plastics Specimens
7.1 This procedure requires a table that is flat and level. The
table must be at least 50 in. long and at least as wide as the
3. Terminology
widest test specimen to be measured. The height of the table is
3.1 Definitions—Definitions are in accordance with Termi-
not critical.The edge of the table over which the specimen will
nology D883 and D1600 unless otherwise indicated.
extend shall not have a radius more than 0.125 in. The table
must be positioned on a hard surface or floor (no carpet) that is
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
also flat and level over a length extending at least 50 in. from
and is the direct responsibility of Subcommittee D20.24 on Plastic Building
the edge of the table.
Products.
7.2 Aweightconsistingofa5lbsandbagisusedtoholdthe
Current edition approved March 10, 2002. Published May 2002. DOI: 10.1520/
D6777-02. end of the siding specimen firmly against the table top. The
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
weight shall be as wide as the widest siding specimen to be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tested.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6777–02
7.3 A line shall be drawn on the table to ensuring that the 11. Procedure
specimensarepositionedperpendiculartotheedgeofthetable.
11.1 Select one (unnotched) end of the specimen to be the
This line shall be drawn as a perpendicular to the edge using a
end that will extend off the table. Label this end of the
large framing square at least 10 in. on each side.
specimen to avoid subsequent confusion about which end is to
7.4 Arigid ruler (such as a folding carpenter’s ruler or large 1
be unsupported. Using a tape measure, make a mark 50 6 ⁄16
metal framing square) is used to measure the distance from the
in. from this unsupported end.
floor to the table top and the suspended end of the siding
11.2 Place the specimen face up (the face is the side that is
specimen. This ruler needs to be at least one inch longer than
exposed after installation) on the table so that the specimen is
the height of the table, and shall be scribed to allow measure-
perpendicular to the edge of the table (parallel to the perpen-
ments to the nearest ⁄16 in. It is recommended that the end of
dicular line drawn on the table) and with the 50 in. mark
the ruler that will be placed against the floor be protected with
directly over the table edge.
a metal cap, etc. to ensure against abrasive wear.
11.3 Place the weight described in 7.2 on the supported end
7.5 A tape measure is used to measure the length of the
of the specimen (the end on the table). The edge of the weight
siding specimen. This tape measure needs to be at least 101 in.
furthest from the supported end shall be 6 6 0.5 in. from the
long, and shall be scribed to allow measurements to the nearest
supported end (see Fig. 1). The weight shall cover the entire
⁄16 in.
width of the specimen.After positioning the weight verify once
again that the position of the specimen is as described in 11.2.
8. Sampling, Test Specimens, and Test Units
The panel shall be allowed to bow upwards between the weight
and the table edge.
8.1 The test specimen shall be taken from a vinyl siding
11.4 Three minutes 6 15 seconds after positioning the
panelcomplyingwithSpecificationD3679.Thesidingpanelas
sample as described above, measure the distance from the
tested shall be complete with any weep holes or nail slots as
unsupported end of the specimen to the fl
...
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