ASTM D4226-05

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An American National Standard
Designation: D4226 – 05
Standard Test Methods for
Impact Resistance of Rigid Poly(Vinyl Chloride) (PVC)
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Building Products
This standard is issued under the fixed designation D4226; 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* D374 Test Methods for Thickness of Solid Electrical Insu-
lation
1.1 These test methods cover the determination of the
D618 Practice for Conditioning Plastics for Testing
energy required to crack or break rigid poly(vinyl chloride)
D883 Terminology Relating to Plastics
(PVC) plastic sheeting and profile flat sections used in building
D3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)
products, as well as extruded or molded test samples, under
Siding
specified conditions of impact from a freefalling standard
E178 Practice for Dealing With Outlying Observations
weightstrikinganimpactorwitheitheroftwoconfigurationsin
contact with the specimen.
3. Terminology
1.2 Two test procedures are included:
3.1 Definitions— Definitions are in accordance with Termi-
1.2.1 Procedure A, used to determine minimum impact
nology D883, unless otherwise indicated.
energy required to cause failure (hole, crack, split, shatter, or
3.2 Definitions of Terms Specific to This Standard:
tear).
3.2.1 failure (of test specimen)—signifiedbythepresenceof
1.2.2 Procedure B, used to determine minimum impact
a punched hole, crack, split, shatter, or tear that was created in
energy required to cause brittle failure.
the target area by the impact of the falling weight and is clearly
1.3 The values in inch-pound units are to be regarded as the
visible to the naked eye when the sample is held up to the light
standard.
(see Fig. 1).
NOTE 1—There is no similar or equivalent ISO standard.
3.2.2 brittle failure—a punched hole, split, or shatter where
a piece of the specimen separates from the main part of the
1.4 The text of this standard references notes and footnotes
which provide explanatory material. These notes and footnotes specimen or a crack that has a 0° angle at the tip as measured
(excluding,thoseintablesinfigures)shallnotbeconsideredas by the naked eye (see Fig. 1).
3.2.3 mean failure height (Procedure A)—the height from
requirements of this standard.
1.5 This standard does not purport to address all of the which the falling weight will cause 50 % of the specimens to
fail.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.2.4 mean failure energy (mean impact resistance), ( Pro-
cedure A)—energy required to produce 50 % failures; the
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Specific precau- product of the weight and mean failure height.
3.2.5 normalized mean failure energy (normalized mean
tionary statements are given in Section 8.
impact resistance)—the mean failure energy per unit (average)
2. Referenced Documents
specimen thickness (Procedure A).
2
2.1 ASTM Standards: 3.2.6 mean brittle failure height—the height from which the
falling weight will cause 50 % brittle failures in specimens
(Procedure B).
1
These test methods are under the jurisdiction of ASTM Committee D20 on 3.2.7 mean brittle failure energy (mean energy of ductile-
Plastics and are the direct responsibility of Subcommittee D20.24 on Plastic
to-brittle transition), (Procedure B)—energy required to pro-
Building Products.
duce 50 % brittle failures; the product of the weight and mean
Current edition approved March 1, 2004. Published June 2005. Originally
brittle failure height.
approved in 1983. Last previous edition approved in 2000 as D4226 - 00. DOI:
10.1520/D4226-05.
3.2.8 normalized mean brittle failure energy (normalized
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mean energy of ductile-to-brittle transition), (Procedure B)—
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
the mean brittle failure energy per unit (average) specimen
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. thickness.
*A Summary of Changes section appears at the end of this standard.
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D4226 – 05
FIG. 1 Types of Failures of the Specimen
3.2.9 outlier—an observation that appears to deviate mark- or Up-and-Down Method. Testing is concentrated near the
edly from other members of the sample in which it occurs. mean
...