Assertion: gypsum's amount | /r/HasProperty | mentioned account
Facets:
value: usually
type: DEGREE
value: in the aggregate
type: MANNER
Source sentences:
text: Even though the amount of the acidic impurities mentioned usually accounts, in the aggregate, for less than 2% of the waste material, it is sufficient to prevent successful utilization of synthetic gypsum in the making of plasterboard of a commercially acceptable quality at an economically permissible cost.