Assertion: aqueous film forming foam | /r/HasProperty | contain
Facets:
value: frequently
type: TEMPORAL
Source sentences:
text: Aqueous film forming foams (AFFF) are water-based and frequently contain hydrocarbon-based surfactant such as sodium alkyl sulfate, and fluorosurfactant, such as fluorotelomers, perfluorooctanoic acid (PFOA), or perfluorooctanesulfonic acid (PFOS).