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The Relative thermal index (RTI) is a characteristic parameter related to the ability of plastic materials to resist thermal degradation. The RTI is part of the longterm thermal aging program (LTTA) described in the standard from UL. Though the RTI is an index, it is given in Celsius units. The UL 746B standard distinguishes between three sub-categories of the RTI: * Electrical RTI which relates to electrical insulating performance. * Mechanical impact RTI which relates to mechanical performance with impact * Mechanical strength RTI which relates to mechanical performance without impact

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rdfs:label	Relativer Temperaturindex (de) Relative thermal index (en)
rdfs:comment	Der Relative Temperaturindex (RTI) nach UL 746B ist ein Maß für die thermische Alterungsbeständigkeit eines Kunststoffes bei erhöhter Temperatur. Der RTI wird als die Temperatur definiert, nach der es für einen Werkstoff (Candidate B) bei Lagerung in Luft ebenso lange wie bei einem vergleichbaren anderen Werkstoff (Control A) bei dessen bereits bekannter RTI-Temperatur dauert, bis eine spezifizierte Eigenschaft auf 50 % ihres ursprünglichen Wertes abgefallen ist. Es gibt den RTI für unterschiedliche Materialdicken und typischerweise folgende Kenngrößen: (de) The Relative thermal index (RTI) is a characteristic parameter related to the ability of plastic materials to resist thermal degradation. The RTI is part of the longterm thermal aging program (LTTA) described in the standard from UL. Though the RTI is an index, it is given in Celsius units. The UL 746B standard distinguishes between three sub-categories of the RTI: * Electrical RTI which relates to electrical insulating performance. * Mechanical impact RTI which relates to mechanical performance with impact * Mechanical strength RTI which relates to mechanical performance without impact (en)
dct:subject	Threshold temperatures Materials testing
Wikipage page ID	56880784 (xsd:integer)
Wikipage revision ID	1122632443 (xsd:integer)
Link from a Wikipage to another Wikipage	Plastic Threshold temperatures Celsius UL (safety organization) Air Materials testing Plastic film Dielectric Polymer Mechanic strength Mechanical impact Insulation resistance testing Thermal degradation dbr:UL_746B
sameAs	Relative thermal index Relative thermal index Relative thermal index
dbp:wikiPageUsesTemplate	dbt:ISBN dbt:Reflist
has abstract	Der Relative Temperaturindex (RTI) nach UL 746B ist ein Maß für die thermische Alterungsbeständigkeit eines Kunststoffes bei erhöhter Temperatur. Der RTI wird als die Temperatur definiert, nach der es für einen Werkstoff (Candidate B) bei Lagerung in Luft ebenso lange wie bei einem vergleichbaren anderen Werkstoff (Control A) bei dessen bereits bekannter RTI-Temperatur dauert, bis eine spezifizierte Eigenschaft auf 50 % ihres ursprünglichen Wertes abgefallen ist. Es gibt den RTI für unterschiedliche Materialdicken und typischerweise folgende Kenngrößen: * Durchschlagfestigkeit (RTI Elec) * Zugfestigkeit (RTI Str) * Schlagfestigkeit (RTI Imp) (de) The Relative thermal index (RTI) is a characteristic parameter related to the ability of plastic materials to resist thermal degradation. The RTI is part of the longterm thermal aging program (LTTA) described in the standard from UL. During the process of the UL 746B program, the degradation in hot air of certain properties of the material like dielectric and mechanic strength, is investigated with regards to thermal-aging. For a full study, the candidate material (B) is aged together with a reference material A (control) with already known RTI value in the same ovens. The RTI is the rounded temperature in degrees C, at which the properties of B have decreased to 50 percent of their initial value in about the same amount of time (correlation time) than it takes for A at its own RTI value. A maximum correlation time of 60.000 hours is considered acceptable for many electrical applications, however it may also become as low as 5.000 hours according to UL 746B. If a material has not been investigated (yet), the RTI shown is based on the generic class (polymer type) of the material. Though the RTI is an index, it is given in Celsius units. The UL 746B standard distinguishes between three sub-categories of the RTI: * Electrical RTI which relates to electrical insulating performance. * Mechanical impact RTI which relates to mechanical performance with impact * Mechanical strength RTI which relates to mechanical performance without impact There is also the RTI Elongation (by means of Elongation at break) for films and other nonrigid materials. (en)
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page length (characters) of wiki page	2418 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Relative_thermal_index
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