Assertion: calcium carbonate | /r/HasProperty | sufficient purity
Facets:
value: to have abrasive contaminants
type: PURPOSE
value: preferably
type: DEGREE
Source sentences:
text: Furthermore, the calcium carbonate preferably is of sufficient purity so as to have abrasive contaminants such as silica and alumina at a level low enough to not significantly impact the anti-wear properties of the resulting grease.