CRT Laboratories Inc.
Phone: (714) 283-2032
New clients receive
10% discount on first
Notched Izod Impact is a test of how impact resistant a polymer will be. This is useful information when the application is for high impact performance. A sample is place in the clamping zone so that it is cantilevered upward with the notch facing the direction of impact. The pendulum is released and the force required to break the specimen is calculated from the height the pendulum reaches the follow-through.
The Izod Impact test is a measurement from energy used to break a notch in the specimens. It's usually calculated in units of ft./lb.-in. and is tested at room, cold or elevated temperatures. The Izod factor is useful in comparing various types of resins and/or compounds. In comparing one plastic with another, the Izod test should not be considered the absolute strength value, because the sensitivity of some materials may produce erroneous results. Nylons, Polycarbonates and Acetal material are know to be sensitive-notch materials. The Izod test may indicate the need for revising of the mold for sharp edges for corners that would have an adverse effect on the strength behavior of the molded part.
Specimens: 1/8" thick x 1/2" wide x 2-1/2" long.
Back to Testing Contents