MaTestLab > ASTM Methods > ASTM D256, ISO 180 Determination of Izod Pendulum Impact Resistance of Plastics
Last updated 17th March 2026
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.
Get Certified ASTM D256 for Plastic Impact Strength
ASTM D256 certification is a standardized measurement of Izod pendulum impact resistance of plastics. Compliance checks the plastic materials to bounce back the abrupt impact forces without breaking. It is a test procedure by ASTM International that is more commonly applied to assess the toughness and durability of plastic substances.
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ASTM D256 Testing Procedure and Requirements
Test procedures A, C, and D
The notch will create a concentration of stress, which will cause the likelihood of a brittle fracture to occur instead of a ductile fracture. The pendulum swing breaks the specimen, which is held in an expanded vertical cantilever beam. The energy spent in throwing away the portion of the specimen is ascertained.
Test procedure E
The resistance to the impact is taken by turning the notched specimen 180 degrees into the clamping vise. The findings are expressed as the amount of energy absorbed per unit width of the specimen.
Scope of ASTM D256
Includes finding of the Izod pendulum impact resistance of plastic substances.
Tests the hardness and impact of plastics.
Can be applied to thermosetting and rigid thermoplastics.
Assists in material comparison and quality control tests.
Offers standardized procedures of impact testing.
ASTM D256 Equipment and Sample Preparation
Specimen Details
Specimens should be solid and of uniform shape, which is rectangular.
Specimen dimensions
The overall sample size is 3.0-12.7 mm (0.118-0.500 in.), on average. The specimen is 6.3mm thick, and the depth in the notch of the specimen is 10.2mm.
Specimen preparation
Specimens are prepared by injection-molding or cut out of extruded or molded sheets or plates.
Applications of ASTM D256
Plastic products and components quality control.
Testing of plastic material used in automotive parts.
Plastic housing and consumer products testing.
Impact-resistant polymers research and development.
Comparison of various plastic make-ups.
Common Challenges and Troubleshooting in ASTM D256 Testing
Poor specimen preparation, environmental conditions, machine calibration, sample handling and storage, and test setup inconsistencies are some of the challenges experienced during testing. Troubleshooting of these problems would require proper preparation of specimens, a constant testing environment, proper calibration of the impact testing machines, and specimen handling.
ASTM D256 Aggregate Testing Technique, Process, and Data Collection
Normal notched plastic samples are installed in an Izod impact tester. The puncture of the specimen is performed with a pendulum hammer, which fractures the specimen. The instrument measures the energy taken during breakage and records it to determine the impact resistance of the material.
ASTM D256 Analysis Results and Interpretation
An increase in the values of absorbed energy means high toughness and resistance to impulsive impact. The low values indicate brittle behavior and diminished durability. Findings can assist manufacturers in choosing materials that could be used in activities involving mechanical strength.
ASTM D256 Problem & Solution
Plastic materials can experience unpredictable failures due to exposure to impact forces; ASTM D256 presents a standardized test, which is the Izod pendulum test, to determine impact resistance to guarantee a dependable assessment of plastic toughness and material performance.
Factors to Consider for ASTM D256
Speed The test is fast, and it can be used in normal material analysis.
Expertise There must be proper specimen preparation and calibration of the tester to get the results.
Cost The Izod impact tester is a mid-priced instrument, yet it offers good measurement of the impact strength of plastic materials.
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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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