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ASTM D4272-03

(Test Method)

Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop

Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop

SCOPE
1.1 This test method describes the determination of the total energy impact of plastic films by measuring the kinetic energy lost by a free-falling dart that passes through the film.
1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets are for information only.
1.3 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.
Note 1—The ISO reference for this test method is ISO 7765-2; however, this test method is not equivalent to Test Method D 4272. The ISO test method calls for a direct readout of energy by using a load cell as part of the impactor head, while Test Method D 4272 calls for a constant weight impactor, then measuring the time of travel through a given distance to get energy values. Therefore, the two are not equivalent in this respect.

General Information

Status
Historical
Publication Date
31-Oct-2003
ICS
83.140.10 - Films and sheets
Technical Committee
D20 - Plastics
Drafting Committee
D20.19 - Film, Sheeting, and Molded Products
Current Stage
Ref Project

Relations

Replaces
ASTM D4272-99 - Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop
Effective Date
01-Nov-2003
Replaced By
ASTM D4272-08 - Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop
Effective Date
01-Mar-2008
Referred By
ASTM D1709-22 - Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method
Effective Date
01-Nov-2003
Referred By
ASTM D3420-21 - Standard Test Method for Pendulum Impact Resistance of Plastic Film
Effective Date
01-Nov-2003

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ASTM D4272-03 - Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4272–03
Standard Test Method for
1
Total Energy Impact of Plastic Films By Dart Drop
This standard is issued under the fixed designation D 4272; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* ISO 7765–2 Plastics Film and Sheeting—Determination of
Impact Resistance by the Free Falling Dart Method—Part
1.1 This test method describes the determination of the total
2: Instrumented Puncture Test
energy impact of plastic films by measuring the kinetic energy
lost by a free-falling dart that passes through the film.
3. Terminology
1.2 The values stated in SI units are to be regarded as the
3.1 Definitions of Terms Specific to This Standard:
standard.Thevaluesgiveninbracketsareforinformationonly.
3.1.1 free-fall time—the measured time required for the dart
1.3 This standard does not purport to address all of the
to travel through the sensing area with no film specimen in the
safety concerns, if any, associated with its use. It is the
clamp.
responsibility of the user of this standard to establish appro-
3.1.2 missile weight—the weight of the dart plus the total
priate safety and health practices and determine the applica-
value of incremental weights attached, including the locking
bility of regulatory limitations prior to use.
collar.
NOTE 1—The ISO reference for this test method is ISO 7765-2;
3.1.3 test-fall time—the measured time for the dart to travel
however, this test method is not equivalent to Test Method D 4272. The
through the sensing area with a film specimen in the clamp.
ISO test method calls for a direct readout of energy by using a load cell
as part of the impactor head, while Test Method D 4272 calls for a
4. Summary of Test Method
constant weight impactor, then measuring the time of travel through a
4.1 The velocity of a freely falling dart of specified shape
given distance to get energy values. Therefore, the two are not equivalent
in this respect. that has passed through a sheet of plastic film is determined by
means of a photoelectric speed trap. The kinetic energy
2. Referenced Documents
corresponding to this velocity is calculated and compared with
2
2.1 ASTM Standards:
the kinetic energy of the same dart measured without a plastic
D 374 Test Methods for Thickness of Solid Electrical Insu-
film in place. The loss in kinetic energy of the dart due to
lation
rupturing of the film is used as an index of impact resistance.
D 618 Practice for Conditioning Plastics for Testing
5. Significance and Use
D 1709 Test Methods for Impact Resistance of Plastic Film
by the Free-Falling Dart Method 5.1 Evaluation of the impact toughness of film is important
D 3420 Test Method for Pendulum Impact Resistance of
inpredictingtheperformanceofamaterialinapplicationssuch
Plastic Film as packaging, construction, and other uses. The test simulates
E 171 Specification for Standard Atmospheres for Condi-
theactionencounteredinapplicationswheremoderate-velocity
tioning and Testing Flexible Barrier Materials blunt impacts occur in relatively small areas of film.
E 691 Practice for Conducting an Interlaboratory Study to
5.2 The values obtained by this test method are highly
Determine the Precision of a Test Method dependent on the method and conditions of film fabrication as
3
2.2 ISO Standard:
well as the type and grade of resin.
5.3 Test methods employing different missile velocities,
impinging surface diameters, or effective specimen diameters
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
will most likely produce different results. Data obtained by this
and is the direct responsibility of Subcommittee D20.19 on Film and Sheeting.
testmethodcannotnecessarilybecompareddirectlywiththose
Current edition approved November 1, 2003. Published January 2004. Originally
approved in 1983. Last previous edition approved in 1999 as D 4272 - 99. obtained by other test methods.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4 The impact resistance of a film, while partly dependent
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
on thickness, does not have a simple correlation with sample
Standards volume information, refer to the standard’s Document Summary page on
thickness. Hence, impact values expressed in joules (ft·lbf)
the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
normalized over a range of thickness will not necessarily be
4th Floor, New York, NY 10036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive,
...

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ASTM D4272/D4272M-23(Test Method)
Standard Test Method for Total Energy Impact of Plastic Films by Dart Drop

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FIG. 1 Elements of an Instrumented Dart Drop System
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SCOPE
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