Assertion: calcium carbonate | /r/HasProperty | key component
Facets:
value: in the backing of carpets
type: LOCATION
Source sentences:
text: Calcium carbonate is also a key component in the backing of carpets, in addition to being responsible for the hard water spots left behind in the shower or bath tub.
text: Calcium carbonate is a key ingredient in many household cleaning powders like Comet and is used as a scrubbing agent.