Charpy impact energy is highly temperature-sensitive, so consistent pre-test conditioning is one of the biggest levers you have to reduce scatter. Conditioning in this system brings each specimen to the same defined sub-zero target and holds a stable setpoint, so differences in absorbed energy are driven more by the material and notch quality, not by unintended temperature variation.

This chamber is designed to cool specimens uniformly and limit temperature gradients through thermal balance and circulation. A self-adjusting temperature controller and platinum–iridium sensor help monitor and regulate the conditioning temperature, supporting tight control with ≤ ±0.5°C accuracy and 0.01°C resolution.

In day-to-day ASTM E23 and ISO 148 workflows, repeatability improves further when you standardize handling around the chamber, for example:

• Use a consistent soak and loading practice so all specimens reach equilibrium the same way.
• Keep transfer steps short and repeatable to avoid warming before the pendulum strike.
• Use the correct cooling medium, such as ethanol or another non-freezing solution, for uniform heat transfer.

If you want to confirm the right NG-ISCC model and cooling approach for your target temperature and throughput, learn more or request a quote.