UL黄卡的Elec（Electrical）、Imp（Impact）、Str（Strength）分别要怎么理解？

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UL黄卡的Elec（Electrical）、Imp（Impact）、Str（Strength）分别要怎么理解？
4 W; ]' D* h) [3 Q' L( E+ N3 ~有没有统一的规定或说明？

wangjb

电气、冲击、强度

rocknan

RTI Elec — Electrical RTI, associated with critical insulating properties.
% {  H4 i9 V) y& `! h+ s- w' F
5 [5 y4 Y. f. d. W* n2 R- mRTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
8 f/ R7 T0 j  q+ L& E, a
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.

scofieldzhuo

rocknan 发表于 2019-11-7 08:59
( x; v+ v1 ^, e7 H$ }RTI Elec — Electrical RTI, associated with critical insulating properties.

/ y, q6 X; I5 w# A) {- O- H$ J6 ?2 r5 NRTI Mech Imp — Mecha ...

0 e( |2 S2 s% |0 Y3 n2 p/ H6 V$ C你好，PCB板上的绝缘片是按电气温度限值来卡就好了？还是说还需满足强度温度限值？

rocknan

IT產品都是看電氣溫度唷, 不管是PCB 還是 塑膠外殼  都是看 電氣溫度
甚麼時候看 强度温度, 我忘了~~~~~哈哈

! c4 ]' o6 f( Z- W太久了@@

包子

多看一下QMFZ2.GuideInfo，这上边有解释每个UL关注的参数所表达的内容。

包子

Part of Guide info.:
4 N/ Q- |+ d: D9 \0 WThermal Endurance
7 Z4 F' J1 |( B0 T, gThe 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.
6 l1 M# F' ^! i0 ~& L" T! q
3 l+ _$ U9 a/ w0 E& Q! URTI Elec — Electrical RTI, associated with critical insulating properties.
& S; L2 O- a* Y2 a- dRTI 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.

scofieldzhuo

rocknan 发表于 2019-11-8 09:56
IT產品都是看電氣溫度唷, 不管是PCB 還是 塑膠外殼  都是看 電氣溫度
甚麼時候看 强度温度, 我忘了~~~~~哈 ...

2 @3 n2 o9 ^/ d) ~4 O9 @0 a9 q我了解到的是：外壳要做跌落，撞击等测试，所以要满足这三个档，
内部的绝缘片（insulation sheet）要满足强度和电气这两档。

jiayou

同一个料，这三个温度通常不会相差太大吧？！

scofieldzhuo

jiayou 发表于 2019-11-11 14:10
' Z7 L3 T+ r) l- M# C  l3 w) d同一个料，这三个温度通常不会相差太大吧？！

* D1 g- s) ~4 \+ X# K' D& d% ~刚好是150℃还是95℃的问题，