@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_polyimide_	skos:broader	isac:_polyetherimide_ .
isac:polytetrafluoroethylene_ptfe_	skos:broader	isac:_polyetherimide_ .
isac:_ultem_1000	skos:broader	isac:_polyetherimide_ .