Assertion: endotracheal tube | /r/HasProperty | formed of silicone rubber
Facets:
value: preferably
type: DEGREE
Source sentences:
text: Both the endotracheal tube 12 and catheter 14 are preferably formed of a flexible plastic, such as polyvinylchloride (PVC) or silicone rubber, which is suitable for insertion into the trachea 16 of a human 18.