ASTM D256

Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

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Organization: ASTM
Publication Date: 1 May 2010
Status: active
Page Count: 20
ICS Code (Plastics and rubber insulating materials): 29.035.20
scope:

These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulumtype hammers, mounted in "standardized" machines, in breaking standard specimens with one pendulum swing (see Note 2). The standard tests for these test methods require specimens made with a milled notch (see Note 3). In Test Methods A, C, and D, the notch produces a stress concentration that increases the probability of a brittle, rather than a ductile, fracture. In Test Method E, the impact resistance is obtained by reversing the notched specimen 180° in the clamping vise. The results of all test methods are reported in terms of energy absorbed per unit of specimen width or per unit of cross-sectional area under the notch. (See Note 4.)

NOTE 1-The machines with their pendulum-type hammers have been "standardized" in that they must comply with certain requirements, including a fixed height of hammer fall that results in a substantially fixed velocity of the hammer at the moment of impact. However, hammers of different initial energies (produced by varying their effective weights) are recommended for use with specimens of different impact resistance. Moreover, manufacturers of the equipment are permitted to use different lengths and constructions of pendulums with possible differences in pendulum rigidities resulting. (See Section 5.) Be aware that other differences in machine design may exist. The specimens are "standardized" in that they are required to have one fixed length, one fixed depth, and one particular design of milled notch. The width of the specimens is permitted to vary between limits.

NOTE 2-Results generated using pendulums that utilize a load cell to record the impact force and thus impact energy, may not be equivalent to results that are generated using manually or digitally encoded testers that measure the energy remaining in the pendulum after impact.

NOTE 3-The notch in the Izod specimen serves to concentrate the stress, minimize plastic deformation, and direct the fracture to the part of the specimen behind the notch. Scatter in energy-to-break is thus reduced. However, because of differences in the elastic and viscoelastic properties of plastics, response to a given notch varies among materials. A measure of a plastic's "notch sensitivity" may be obtained with Test Method D by comparing the energies to break specimens having different radii at the base of the notch.

NOTE 4-Caution must be exercised in interpreting the results of these standard test methods. The following testing parameters may affect test results significantly:

Method of fabrication, including but not limited to processing technology, molding conditions, mold design, and thermal treatments;

Method of notching;

Speed of notching tool;

Design of notching apparatus;

Quality of the notch;

Time between notching and test;

Test specimen thickness,

Test specimen width under notch, and

Environmental conditioning.

The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

NOTE 5-These test methods resemble ISO 180:1993 in regard to title only. The contents are significantly different.

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 

 

Document History

ASTM D256
May 1, 2010
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to “standardized” (see Note 1) pendulumtype hammers, mounted in “standardized” machines, in breaking standard specimens with...
May 1, 2010
Standard Test Methods for IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
These methods cover the determination of the resistance to breakage by flexural shock of plastics and electrical insulating materials, as indicated by the energy extracted from "standardized" (Note...
May 1, 2010
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to “standardized” (see Note 1) pendulumtype hammers, mounted in “standardized” machines, in breaking standard specimens with...
May 1, 2010
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulumtype hammers, mounted in "standardized" machines, in breaking standard specimens with...
December 1, 2006
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulumtype hammers, mounted in "standardized" machines, in breaking standard specimens with...
December 1, 2006
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to “standardized” (see Note 1) pendulum-type hammers, mounted in “standardized” machines, in breaking standard specimens with...
March 15, 2006
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to “standardized” (see Note 1) pendulumtype hammers, mounted in “standardized” machines, in breaking standard specimens with...
November 1, 2005
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
* These test methods cover the determination of the resistance of plastics to “standardized” (see Note 1) pendulum-type hammers, mounted in “standardized” machines, in breaking standard specimens...
January 1, 2005
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard specimens with...
May 1, 2004
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
(Footnote *) These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard...
December 1, 2003
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
(Footnote *) These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard...
August 10, 2002
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
A description is not available for this item.
August 10, 2002
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard specimens with...
November 10, 2000
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
(Footnote *) These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard...
November 10, 2000
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard specimens with...
April 10, 1997
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
1. Scope 1.1 These test methods cover the determination of the resistance of plastics to "standardized" (see Note 1) pendulum-type hammers, mounted in "standardized" machines, in breaking standard...
August 15, 1993
STANDARD TEST METHODS FOR DETERMINING THE PENDULUM IMPACT RESISTANCE OF NOTCHED SPECIMENS OF PLASTICS
A description is not available for this item.
January 1, 1993
Standard Test Methods for Determining the Pendulum Impact Resistance of Notched Specimens of Plastics
A description is not available for this item.
October 15, 1992
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.
December 28, 1990
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.
November 8, 1990
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.
March 30, 1990
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.
March 25, 1988
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS (E1-1989)
A description is not available for this item.
November 27, 1987
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.
July 27, 1984
STANDARD TEST METHODS FOR IMPACT RESISTANCE OF PLASTICS AND ELECTRICAL INSULATING MATERIALS
A description is not available for this item.

References

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