Assertion: polymer | /r/HasProperty | insulator
Facets:
value: for a long period of time
type: TEMPORAL
value: at best
type: DEGREE
value: electrically
type: MANNER
value: usually
type: DEGREE
Source sentences:
text: Usually polymers are electrically insulators, at best, semiconductors.
text: For a long period of time, polymers were considered as insulators.