ASTM D4812-99
Historical Standard: ASTM D4812-99 Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics
SUPERSEDED (see Active link, below)
ASTM D4812
1. Scope
1.1 This test method covers the determination of the resistance to breakage by flexural shock of plastics, as indicated by the energy extracted from standardized (Note 1) pendulum-type hammers, mounted in standardized machines, in breaking standard specimens with one pendulum swing. The result of this test is reported in terms of impact strength per unit of specimen width.
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. Hammers 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 4), and other differences in machine design).1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety problems, 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Keywords
cantilever beam; impact resistance; plastic molding; unnotched; Breakage resistance; Breaking strength/tenacity; Cantilever testing; Deformation--plastics; Excess-energy pendulum-impact test; Flexural testing--plastics; Fracture testing--plastics; Impact testing--plastics; Molding/extrusion compounds/materials; Pendulum test; Plastics; Reinforced thermosetting plastics (RTP); Sheet materials (general); Shock test; Strength--plastics; Thermoplastics; Unnotched cantilever beam test; Vibration test;
ICS Code
ICS Number Code 83.140.99 (Other rubber and plastic products)
DOI: 10.1520/D4812-99
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