Technical guide for choosing low temperature O-rings

The low temperature O-ring seals maintain elasticity and sealing capability when the material approaches the glass transition point — the temperature at which an elastomer shifts from a flexible and elastic state to a rigid and brittle one.

What are they and what do they provide in the field of sealing?

These are sealing elements designed to ensure reliable performance below 0 °C by delaying the glass transition and reducing the cold compression set. They deliver reliable start-ups, fewer leaks in intermittent equipment and a longer service life in cold–hot thermal cycles.

Advantages of choosing a low temperature O-ring

Maintained elasticity and fast recovery within a range of 0°C to −50 °C

Stable sealing during cold start-ups and in equipment with extended downtime.

Lower risk of cracking and microleakage due to thermal contraction.

Most common applications

Pneumatics, automation and machinery in cold environments.

Pumps, valves and refrigeration (HVAC) systems.

Instrumentation, dosing and outdoor equipment.

What materials are available at HAISUN?

To select the correct material, it is ideal to know as many details as possible: medium, pressure, minimum/maximum temperature, thermal cycle, Shore A hardness, cold start-ups, movement speed... All of this helps ensure the correct selection of the seal. However, in a very summarised way we can say that:

NBR (50–70 Shore A) is the most economical option for mineral oils, dry air and general industry applications.

EPDM (70/90 Shore A) performs best in contact with water, steam and glycols.