The Class H impact tester is used to measure the impact toughness of metallic specimens using the Charpy method. It swings a pendulum of known energy into a notched specimen and records how much energy is absorbed during fracture. This helps engineers and quality teams understand how a material behaves under sudden loading, especially at different temperatures or after heat treatment and welding.

With available pendulums up to 750 J, the system is suited for high-strength steels and other materials that absorb significant energy before breaking. It is used for tasks such as batch release testing, procedure qualification, weld qualification, and research into ductile-to-brittle transition behavior.

In its instrumented version, the tester also captures force–time data, so labs can look beyond a single energy number and study crack initiation and growth in more depth.

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