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Impact Testing Cuts Through Plastics Material Challenges

Impact Testing Cuts Through Plastics Material Challenges

Our HIT pendulum impact testers cover the entire range of impact strength measurement for plastics.  Impact testing systems are available in capacities from 5 to 50 joules and may be used for tests to all established standards (ASTM, ISO, DIN) and methods (Izod, Charpy, Dynstat, impact tensile), making them the most modern products available on the market today.  Each system in the HIT product family runs on testXpert III, offering the same user management, statistical analysis and data export features available with all Zwick products.  Embedded sensors work in concert with testXpert III to automatically identify the installed pendulum, supporting test result traceability and eliminating incorrect pendulum selection as a source of operator error.
The 5.5J pendulum impact tester, designed for both ASTM and ISO tests, represents one of the most popular selections for customers in the plastics industry.  To support varying needs for throughput, we offer three different automation solutions.  The specimen feeding magazine in our roboTest H system streamlines the presentation of specimens for testing while the roboTest I pre-conditions specimens for testing at the required temperature.  In the roboTest R system, an industrial robot presents specimens for testing, delivering a fully automated solution. 

Expert engineering in our HIT line of pendulum impact testers removes common sources of vibration that can result in error Propagation.  Zwick uses high performance carbon materials in the construction of HIT pendulums.  This offers the following advantages:

  • Significantly higher pendulum stiffness
  • Ideal distribution of mass
  • Repeatable, reproducible test results

With the HIT line of pendulum impact testers, customers can test in a measurement range up to 80% of the potential energy. 

Intelligent features reduce changeover time between tests and lend further support for reliable test results.  Each Zwick pendulum carries its data in onboard electronics.  This enables the pendulum to identify itself to the HIT impact tester electronics, communicating vital information such as:  the test standard, test type, energy capacity, starting angle, and other physical data.  Our HIT impact testers also store the air and bearing friction data, eliminating potential for errors in test setup.  Freely selectable starting angles optimize test parameters such as impact speed and energy loss at impact.  After each test, a motor drive in the system automatically captures the pendulum and returns it to the starting position. 

Achieving reliable test results begins with proper specimen preparation.  Our ZNO automatic notch-cutting machine prepares specimens in accordance with testing standards.  An operator-friendly display allows for fast setup and the selection of new parameters such as cutting speed and feed rate.  

As with all of our testing systems, safety is paramount. All HIT pendulum impact testers incorporate a safety housing as standard.  Additional features lend further support for safe operation:

  • A safety guard on the Charpy fixture ensures specimens are contained within the impact tester during Charpy testing.
  • The swivel feature on the safety housing supports ideal system access, for example, for inserting specimens during Izod tests.
  • An electrically interlocked safety device eliminates air currents during testing and maximizes protection from shattering specimens.  Release of the pendulum requires two-handed operation, eliminating the potential for hazards during testing. 

Further information on our complete line of HIT pendulum impact testers is available here.