Silastic

[ si-las-tik ]
/ sɪˈlæs tɪk /

Trademark.

a brand name for any of a group of substances containing polymeric silicones, having the properties of rubber but more capable of withstanding extremely high and low temperatures and other causes of deterioration, used in jet-plane engines, medical prosthetic devices, gaskets, electrical insulation, etc.

British Dictionary definitions for silastic

Silastic
/ (sɪˈlæstɪk) /

noun

trademark a flexible inert silicone rubber, used esp in prosthetic medicine