Assertion: acetaldehyde | /r/HasProperty | formed as byproduct
Facets:
value: continually
type: TEMPORAL
value: during subsequent melt processing
type: TEMPORAL
Source sentences:
text: Achieving this low level of acetaldehyde is difficult, however, because, as is well known to practitioners of the art, acetaldehyde is continually formed as a byproduct during the polymerization and subsequent melt processing of PET and similar polymers.