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ASTM D4812-06

(Test Method)

Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics

Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics

SCOPE
1.1 This test method covers the determination of the resistance of plastics to breakage by flexural shock, as indicated by the energy extracted from standardized pendulum-type hammers, mounted in standardized machines, in breaking standard specimens with one pendulum swing. The result of this test method is reported as energy absorbed per unit of specimen width.Note 1
The pendulum-type test instruments 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. Pendulums of different initial energies (produced by varying their effective weights) are recommended for use with specimens of different impact strengths. Moreover, manufacturers of the equipment are permitted to use different lengths and constructions of pendulums (with resulting possible differences in pendulum rigidities (see Section ), and other differences in machine design).
1.2 The values stated in SI units are to be regarded as standard. The values given in brackets 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 and health practices and determine the applicability of regulatory limitations prior to use.Note 2
This standard and ISO 180, Method 1U, are similar in content but are not technically equivalent.

General Information

Status
Historical
Publication Date
14-Mar-2006
ICS
83.140.99 - Other rubber and plastics products
Technical Committee
D20 - Plastics
Drafting Committee
D20.10 - Mechanical Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D4812-05 - Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics
Effective Date
15-Mar-2006
Replaced By
ASTM D4812-11 - Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
Effective Date
01-Dec-2011
Referred By
ASTM D4101-17e1 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
Effective Date
15-Mar-2006
Referred By
ASTM D8160-20 - Standard Test Method for Un-notched Cantilever Beam Impact Resistance (Izod Impact) Testing of Thermoplastic Pavement Marking Materials
Effective Date
15-Mar-2006
Referred By
ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
Effective Date
15-Mar-2006
Referred By
ASTM D8033-22 - Standard Classification System for Poly(Ether Ether Ketone) (PEEK) Molding and Extrusion Materials
Effective Date
15-Mar-2006

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ASTM D4812-06 - Standard Test Method for Unnotched Cantilever Beam Impact Resistance of PlasticsASTM D4812-06 - Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
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ASTM D4812-06 - Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
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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:D4812–06
Standard Test Method for
1
Unnotched Cantilever Beam Impact Resistance of Plastics
This standard is issued under the fixed designation D4812; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* D5947 Test Methods for Physical Dimensions of Solid
Plastics Specimens
1.1 This test method covers the determination of the resis-
E691 Practice for Conducting an Interlaboratory Study to
tance of plastics to breakage by flexural shock, as indicated by
Determine the Precision of a Test Method
the energy extracted from standardized pendulum-type ham-
mers, mounted in standardized machines, in breaking standard
3. Terminology
specimens with one pendulum swing. The result of this test
3.1 Definitions—Definitions used in this test method are in
method is reported as energy absorbed per unit of specimen
accordance with Terminology D883.
width.
4. Summary of Test Method
NOTE 1—The pendulum-type test instruments have been standardized
in that they must comply with certain requirements, including a fixed
4.1 This test method differs from others of similar character
height of hammer fall that results in a substantially fixed velocity of the
in that unnotched test specimens are used (see Test Methods
hammer at the moment of impact. Pendulums of different initial energies
D256 for procedures using notched test specimens). The lack
(produced by varying their effective weights) are recommended for use
of a notch makes this test method especially useful for
with specimens of different impact strengths. Moreover, manufacturers of
the equipment are permitted to use different lengths and constructions of reinforced materials where a notch may mask the effects of
pendulums (with resulting possible differences in pendulum rigidities (see
orientation. It may also be used with other filled or unrein-
Section 5), and other differences in machine design).
forced materials where a stress-concentrating notch is not
desired. It is not valid for materials that twist when subjected
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are for information to this test.
only.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 The pendulum-impact test indicates the energy to break
safety concerns, if any, associated with its use. It is the
standard test specimens of specified size under stipulated
responsibility of the user of this standard to establish appro-
conditions of specimen mounting and pendulum velocity at
priate safety and health practices and determine the applica-
impact.
bility of regulatory limitations prior to use.
5.2 The energy lost by the pendulum during the breakage of
NOTE 2—ThisstandardandISO180,Method1U,aresimilarincontent
thespecimenisthesumoftheenergiesrequiredtoproducethe
but are not technically equivalent.
following results:
2. Referenced Documents 5.2.1 To initiate fracture of the specimen,
2 5.2.2 To propagate the fracture across the specimen,
2.1 ASTM Standards:
5.2.3 To throw the free end (or pieces) of the broken
D256 Test Methods for Determining the Izod Pendulum
specimen (toss correction),
Impact Resistance of Plastics
5.2.4 To bend the specimen,
D618 Practice for Conditioning Plastics for Testing
5.2.5 To produce vibration in the pendulum arm,
D883 Terminology Relating to Plastics
5.2.6 To produce vibration or horizontal movement of the
machine frame or base,
5.2.7 To overcome friction in the pendulum bearing and in
1
This test method is under the jurisdiction ofASTM CommitteeD20 on Plastics
the indicating mechanism, and to overcome windage (pendu-
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
lum air drag),
Current edition approved March 15, 2006. Published March 2006. Originally
5.2.8 To indent or deform plastically the specimen at the
approved in 1988. Last previous edition approved in 2005 as D4812-05. DOI:
10.1520/D4812-06.
line of impact, and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2.9 To overcome the friction caused by the rubbing of the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
striking nose (or other part of the pendulum) over the face of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the bent specimen.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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D4812–06
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1.5 The following safety hazards caveat pertains only to the test method portion, Section 11, of this classification system. 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 1: There is no known ISO equivalent to this standard.  
1.6 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.

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  • Technical specification
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ASTM
ASTM D3294-22(Specification)
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes

ABSTRACT
This specification establishes the requirements and test methods for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet manufactured from polytetrafluoroethylene (PTFE) resin molding materials and molded basic shapes made from resin molding and extrusion materials. The sheet or molded basic shape shall be made from unpigmented PTFE and shall be free from foreign matters. Each of the samples shall undergo visual and dimensional inspection to verify their compliance with the standard requirements. The specimens shall conform to the following physical and electrical property requirements: tensile strength; elongation; dielectric strength; specific gravity; porosity; and melting point. Examination for internal defects shall also be conducted to ensure that the specimens are free from microscopic cracks, voids, inclusions, and other surface defects that might affect the serviceability of the materials.
SCOPE
1.1 This specification establishes requirements and methods of test for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet in minimum thicknesses of 0.794 mm (1/32 in.) manufactured from PTFE resin molding materials defined in Specification D4894.  
1.2 This specification also establishes requirements for molded basic shapes made from molding materials. This specification is for products 300 mm (12 in.) or less in a dimension parallel to and 12.7 mm (0.5 in.) or greater in the dimension perpendicular to the direction of the applied molding pressure.  
1.3 The values stated in SI units are to be regarded as the standard.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, of this specification. 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. Special attention is called to 13.2, 13.3, 13.6, 13.8, and A1.  
Note 1: There is no known ISO equivalent to this standard.  
1.5 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.

  • Technical specification
    6 pages
    English language
    sale 15% off
  • Technical specification
    6 pages
    English language
    sale 15% off