is_made_of
Object propertyhttps://www.ontologyrepository.com/CommonCoreOntologies/is_made_of
The relation is made of holds between a material entity and the portion of material it is constituted by. It records the stuff an artifact is composed of at a time.
In a statement this reads as
bfo:Material Entity is_made_of PortionOfMaterial. The property links a subject in its domain to a value in its range.Where it sits in the suite
is made of is defined in the Common Core Ontologies, a mid-level suite that specialises the top-level categories of Basic Formal Ontology. It is released as part of the maintained, logically consistent CCO release and is reused across the connected ontology modules.