Part of Guide info.:4 c% l# @6 k8 {" r3 p
Thermal Endurance
5 l( o" ?- J4 `" nThe materials covered by this program have been investigated with respect to thermal endurance of certain critical properties. The investigation was performed as part of a long-term thermal-aging program or based on historical record in accordance with ANSI/UL 746B, "Polymeric Materials - Long Term Property Evaluations." The temperature below which a class of critical property will not be unacceptably compromised through chemical thermal degradation, over the reasonable life of an electrical product (relative to a reference material having a confirmed, acceptable corresponding performance) is defined as the Relative Thermal Index (RTI). More than one RTI may be appropriate for a given material depending on the property requirements for a given application. In certain cases, higher temperatures are permitted if so specified by the end-use-product standard.
% j' Q' k. w2 {) G2 w2 Y3 ^% u7 F2 r8 D s
RTI Elec — Electrical RTI, associated with critical insulating properties.* h8 H) f. ~" w a l- q
RTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
2 C4 V0 n- Y4 ]2 hRTI 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. |