Assertion: colloidal silica | /r/HasProperty | proven reliable tool
Facets:
value: for concrete polishers
type: TRANSITIVE-OBJECT
value: for others
type: TRANSITIVE-OBJECT
Source sentences:
text: Colloidal silica was introduced as a concrete densifier many years ago, and it has proven itself a reliable tool for concrete polishers and others needing to harden or densify cured concrete surfaces.