MaTestLab > ASTM Methods > ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics
ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics
ASTM D256 is a test method that determines the resistance of plastics to standardized pendulum-type hammers mounted in standardized machines. The impact strength of various materials is determined and compared to accessing their general toughness. The ISO 180 standard also describes the Izod impact test for plastics. ASTM D256 can be used for all plastics to characterize their impact stress behaviour. Read more about ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics below.
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Introduction to ASTM D256
ASTM D256 is a test method designed to measure the Izod pendulum resistance of plastics. Izod impact is basically the kinetic energy needed to initiate fracture and continue the fracture until the specimen breaks. In the ASTM D256 test method, the type of failure for each specimen is recorded as one of the four categories: Complete Break, Hinge Break, Partial Break, and Non-Break. The results obtained are specially used for quality control and specification purposes. The ASTM D256 standard method describes impact testing according to the Izod method for determining the notched impact resistance of plastic materials. Izod notched impact test using ASTM D256 supports various procedures, notch sizes, and notch arrangements to test the notch sensitivity of a polymer material.
ASTM D256 test method generally applies to plastics and helps determine the fracture propagation energy and fracture initiation energy. It helps check the materials’ specific impact properties and compares them for their toughness. MaTestLab has the best network of testing labs in the USA to carry out ASTM D256 tests for our clients.
ASTM D256 Test Method
This test method proceeds by clamping the specimen into the pendulum impact test fixture with the striking edge of the pendulum facing the notched side. The pendulum is then released and made to strike the specimen. The hammer is increased in weight if the breakage does not occur and the impact strength of the materials is recorded.
Test procedures A, C, and D
In these methods, the notch produces a stress concentration that increases the probability of a brittle, rather than a ductile, fracture. The specimen is held in an expanded vertical cantilever beam and is broken by the swing of the pendulum. The energy expended in tossing the portion of the specimen is determined.
Test procedure E
In this method, the impact resistance is obtained by reversing the notched specimen 180° in the clamping vise. The results are stated in terms of energy absorbed per unit width of the specimen.
ASTM D256 Specimens
Specimen details
ASTM D256 Specimens must be solid and uniformly rectangular.
Specimen dimensions
The general sample width for ASTM D256 is between 3.0 and 12.7 mm (0.118 and 0.500 in.) The specimen thickness is 6.3 mm and the depth under the notch of the specimen is 10.2 mm.
Specimen preparation
Specimens are injection molded or cut from molded or extruded sheets or plates.
ASTM D256 Results
This test method evaluates the impact strength of materials. The impact energy is expressed in J/m or ft-lb/in. Impact strength is calculated by dividing impact energy in J (or ft-lb) by the thickness of the specimen. The test result is typically the average of 5 specimens. Impact strength varies with specimen depth, temperature, atmospheric conditions, and hammer weight.
Tests Related to ASTM D256
ISO 180 is similar to ASTM D256 and determines the Izod impact strength of plastics under defined conditions. The specimen for ISO 180 is a Type 1A multipurpose specimen with the end tabs cut off. The sample size is 80 x 10 x 4 mm and the depth under the notch of the specimen is 8 mm. Impact strength is calculated by dividing impact energy in J by the area under the notch. The test result is typically the average of 10 specimens.
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Please contact us for a detailed quote for your astm d256 testing needs. Cost incurred to carry out different astm d256 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm d256?
The required number of samples or specimens should comply with the procedure given in the astm d256 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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How many days will it take to complete the astm d256 test?
The turnaround time for astm d256 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d256 tested?
You can share your astm d256 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d256 test to various testing techniques.
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