Compatibility Materials

Materials	Ionizing Radiation	Ethylene Oxide
Materials	Ionizing Radiation	Compatibility related to absorption	Compatibility related to process conditions
Metals	Possible shielding effect in beta
Glass	Discoloration
Ceramics		Watch out for porosity level
Polymers	Depending on their structure*		Depending on their structure*
Biopolymers	Literature available upon request

Metals are not altered by radiation sterilization because all the energy is dissipated, with no risk of activation.
(Ref: Manual on Radiation Sterilization of Medical and Biological Materials, Technical Reports Series No. 149, p.182, IAEA, Vienna, 1973).
More information
Metals do not adsorb ethylene oxide (Ref: Sterilisation of Biomaterials and Medical Devices, edited by Sophie Lerouge and Anne Simmons, WP Woodhead Publishing, 2012).

Glass becomes discolored under radiation, even at low doses (a few kilograys).
Glass retains only very small amounts of ethylene oxide (Ref: Sterilisation of Biomaterials and Medical Devices, edited by Sophie Lerouge and Anne Simmons, WP Woodhead Publishing, 2012).