High-performance polymers for cryogenics: stability at very low temperatures

Industrial and scientific cryogenics: an extreme challenge for materials

Cryogenics, the physics of very low temperatures (below -150°C), imposes extreme constraints on materials: embrittlement, contraction, loss of elasticity. High-performance polymers (HPPs) such as PCTFE, PTFE and PEI retain their mechanical properties, chemical inertness and dimensional stability even at -196°C, making them indispensable in the space, medical, scientific and energy sectors.

DEMGY has been developing customized HPP plastic parts for cryogenic environments for over 20 years: seals, diaphragms, insulators, valves or internal structures.

Why choose HPPs for cryogenics?

Low thermal expansion, no deformation at -200°C
Chemical inertness to liquefied gases (He, H2, N2, O2...)
Very low gas permeability
Excellent mechanical strength despite extreme temperatures
Traceable manufacturing: CNC machining, molding, post-processing

Examples of HPP applications in cryogenics

PCTFE seals and bushings

Perfect for metal/polymer interfaces
Used in cryogenic valves
Low permeability + high stability

PTFE / PVDF diaphragms and valves

Chemical resistance to liquefied gases
Elasticity maintained at low temperatures
Good machinability for fine shapes

PEI / PEEK insulators and holders

Used in cryostats and measuring instruments
Dimensional stability and electrical insulation
Mechanical resistance to -196°C

DEMGY, an expert partner in extreme environments

Thanks to its complete mastery of HPP processing, DEMGY ensures the reliable manufacture of cryogenic components, with dimensional checks, permeability tests and full batch traceability.