The Class H system is primarily designed for Charpy impact testing according to ASTM E23, ISO 148 and EN10045. Its dual-column frame, support span and striker geometry are optimized for Charpy specimens and the horizontal impact configuration these standards require.

Izod testing uses a different specimen position, support setup and impact direction. Because of this, the standard Class H configuration does not switch between Charpy and Izod without modification. Some components, such as the striking orientation and support assembly, would need to be reconfigured to follow the Izod method correctly.

For labs that need both Charpy and Izod capabilities, it is usually recommended to use a dedicated system or confirm with the supplier whether a compatible Izod attachment is available for the Class H frame. This ensures correct alignment, accurate energy readings and full compliance with the required standards.

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