ASTM D256-10e1
Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

Standard No.

ASTM D256-10e1

Release Date

2010

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D256-10(2018)

Latest

ASTM D256-23e1

Scope

5.1 Before proceeding with these test methods, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, and testing parameters covered in the materials specification shall take precedence over those mentioned in these test methods. If there is no material specification, then the default conditions apply.

5.2 The pendulum impact test indicates the energy to break standard test specimens of specified size under stipulated parameters of specimen mounting, notching, and pendulum velocity-at-impact.

5.3 The energy lost by the pendulum during the breakage of the specimen is the sum of the following:

5.3.1 Energy to initiate fracture of the specimen;

5.3.2 Energy to propagate the fracture across the specimen;

5.3.3 Energy to throw the free end (or ends) of the broken specimen (“toss correction”);

5.3.4 Energy to bend the specimen;

5.3.5 Energy to produce vibration in the pendulum arm;

5.3.6 Energy to produce vibration or horizontal movement of the machine frame or base;

5.3.7 Energy to overcome friction in the pendulum bearing and in the indicating mechanism, and to overcome windage (pendulum air drag);

5.3.8 Energy to indent or deform plastically the specimen at the line of impact; and

5.3.9 Energy to overcome the friction caused by the rubbing of the striker (or other part of the pendulum) over the face of the bent specimen.

5.4 For relatively brittle materials, for which fracture propagation energy is small in comparison with the fracture initiation energy, the indicated impact energy absorbed is, for all practical purposes, the sum of factors 5.3.1 and 5.3.3. The toss correction (see 5.3.3) may represent a very large fraction of the total energy absorbed when testing relatively dense and brittle materials. Test Method C shall be used for materials that have an Izod impact resistance of less than 27 J/m (0.5 ft·lbf/in.). (See Appendix X4 for optional units.) The toss correction obtained in Test Method C is only an approximation of the toss error, since the rotational and rectilinear velocities may not be the same during the re-toss of the specimen as for the original toss, and because stored stresses in the specimen may have been released as kinetic energy during the specimen fracture.

5.5 For tough, ductile, fiber filled, or cloth-laminated materials, the fr......

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ASTM D256-10e1 Referenced Document

• ASTM D3641 Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
• ASTM D4066 Standard Classification System for Nylon Injection and Extrusion Materials (PA)
• ASTM D5947 Standard Test Methods for Physical Dimensions of Solid Plastics Specimens
• ASTM D6110 Standard Test Methods for Determining the Charpy Impact Resistance of Notched Specimens of Plastics
• ASTM D618 Standard Practice for Conditioning Plastics for Testing
• ASTM D883 Standard Terminology Relating to Plastics
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D256-10e1 history

• 2023 ASTM D256-23e1 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2023 ASTM D256-23 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2018 ASTM D256-10(2018) Standard Test Method for Distillation of Pitch
• 2010 ASTM D256-10e1 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2010 ASTM D256-10 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2006 ASTM D256-06a Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2006 ASTM D256-06 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2005 ASTM D256-05a Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2005 ASTM D256-05 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2004 ASTM D256-04 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2003 ASTM D256-03 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2002 ASTM D256-02e1 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2002 ASTM D256-02 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• 2000 ASTM D256-00e1 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics