Assertion: foam | /r/HasProperty | approved
Facets:
value: by the u.s. forest service
type: OTHER
Source sentences:
text: Class A foams that are biodegradable and approved by the U.S. Forest Service, chemicals that make up many Class B foams include perfluorochemicals (PFOAs and PFOCs) that can soak into the groundwater as runoff and potentially contaminate the surrounding environment.