请参考:
See General Information for Plastics - Component
http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?&name=QMFZ2.GuideInfo&ccnshorttitle=Plastics+-+Component&objid=1073827223&cfgid=1073741824&version=versionless&parent_id=1073827222&sequence=1RTI Elec — Electrical RTI, associated with critical insulating properties.
RTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
RTI Mech Str — Mechanical Strength (Mechanical without Impact) RTI, associated with critical mechanical strength and structural integrity where impact resistance, resilience and flexibility may not be essential.