Izod Impact Strength Test Machine for Plastics

The Izod impact strength test was introduced in 1903 by the English engineer Edwid Gilbert Izod. In a nutshell, Izod impact strength testing is a simple test in which a notched or unnotched specimen is struck by a pendulum arm to determine the impact strength of that specimen. The Izod impact energy absorbed in impacting a plastic specimen in an Izod test is assumed to be equal to the difference between the potential energy of the pendulum and the energy remaining in the pendulum after impacting the plastic specimen. Corrections accounting for friction and air-resistance losses must also be made to determine the true Izod impact resistance of the plastic. Izod Impact strength is an important design parameter to consider in plastic structures because it quantifies how a plastic material will withstand sudden shocks or large impulses. Plastics will absorb impulses impacts differently then static load impacts, often high strength plastics are also quite brittle, or having low impact strength. By testing plastics with the Izod test method the impact resistance of the plastic can be determined. Izod impact testing can also be used to determine the sensitivity of notched plastics specimens. Impact resistance of plastic notched specimens measures how will a cracked plastic specimen will withstand an impact. Measuring notch sensitivity of plastics with the Izod test can be applied to plastic designs. Izod testing results are a measure of energy per unit thickness, for example ft-lb/in, or J/cm. Izod testing results of notched specimens are measured in energy loss per unit cross-sectional area, for example J/m2 or ft-lb/in2. Toughness of a plastic describes how much energy the plastic material will absorb while plastic deformation is occurring, and can be determined with Izod impact resistance testing. ISO 180 and ASTM D256 serve as standard test methods for Izod impact resistance testing of plastics. These standard Izod test methods are used for quantifying the impact resistance of plastic materials cover testing of both notched and unnotched plastic specimens. Results of standardized Izod impact strength tests should be used for comparison between materials for quality assurance purposes. ISO13802 is the international standard for the verification of pendulum impact testing machines. TestResources 402D Series Izod impact strength test machine meets the requirements set by ISO 13802. The 402D Series test machine is also designed to meet the Izod impact strength testing requirements of ASTM 256. Email or call our staff with questions regarding Izod impact resistance testing equipment.

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