MaTestLab > ASTM Methods > ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics
Last updated 7th October 2024
ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics
The ASTM D256 test method measures polymers' resistance to standardized pendulum-type hammers fitted in standardized equipment. The impact strength of different materials is calculated and compared to overall toughness. The Izod pendulum impact test is extensively used to examine the impact resistance of plastic materials in a variety of industries, including consumer items, aerospace, automotive, and construction. Producers can analyze the impact performance of different plastics to confirm product quality and safety using the ASTM D256 standards.
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ASTM D256 Introduction
The ASTM D256 test method is intended to quantify polymers’ Izod pendulum resistance. The kinetic energy required to start a fracture and keep it going until the specimen breaks is known as the izod impact. The outcomes are specifically utilized for specifications and quality assurance. The ASTM D256 test method can be used to assess the fracture initiation and propagation energies in plastics. It is generally applicable to polymers. It is useful for comparing the materials’ toughness and verifying their unique impact qualities. MaTestLab has the best network of testing laboratories in the USA to carry out material testing for our clients.
ASTM D256 Test Method
ASTM D256 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 increases in weight if the breakage does not occur and the impact strength of the materials is recorded.
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Test procedures A, C, and D
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 amount of energy expended in tossing the portion of the specimen is determined.
Test procedure E
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.
D256 Equipment and Sample Preparation
Specimen Details
Specimens must be solid and uniformly rectangular.
Specimen dimensions
The general sample width 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 and Interpretation
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 weight of the hammer.
Tests Related to ASTM D256
ASTM D256 is related to tests, including ASTM D618 for plastics conditioning, ASTM D647 for mold designing for plastic specimens, and ASTM D883 for plastics-related terms.
Use of D256 in Various Industries
It is one method of determining relative durability for several types of plastics that exist in various forms and are used across most industries. Everything from automotive, aerospace, and packaging to building possesses plastic parts that could be resilient enough to bear up against sudden force or shock.
Materials Commonly Tested with ASTM D256
This test involves thermoplastics like PC, ABS, and PE engineering plastics such as nylon and polyamide, composite materials with plastic matrices for impact resistance, durability, and structural performance in a wide variety of applications and industries.
Common Challenges and Troubleshooting in D256 Testing
Some of the challenges faced in testing are in specimen preparation, environmental conditions, calibration of the machine, handling and storage of samples, and test setup inconsistencies. To troubleshoot these issues, ensure specimens are prepared accurately, maintain a consistent testing environment, calibrate the impact testing machine, and handle specimens with care.
Importance of ASTM D256
Impact resistance is important for plastics, in which one knows whether materials are resistant to sudden forces and shocks in application usage such as automotive parts, aerospace, and packaging. It enables the knowledge of material selection, design, and quality control.
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FAQ's
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.
How much do I need to pay for the astm d256 test?
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.
How much discount can I get on the astm d256 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
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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