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？
有没有统一的规定或说明？
, h" x# e! D/ P/ G/ ~

wangjb

电气、冲击、强度

rocknan

RTI Elec — Electrical RTI, associated with critical insulating properties.
, u6 i0 s. W# C
7 S" a+ H1 q7 h! p' NRTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
+ M$ O8 n# @) ^1 T9 {" d& O
5 \. P/ y1 I$ F2 B0 M# FRTI 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
RTI Elec — Electrical RTI, associated with critical insulating properties.

RTI Mech Imp — Mecha ...

/ m% U  h1 ^# w! M1 _2 u+ f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
! b' s. ], A  v# G! u3 ~& P甚麼時候看 强度温度, 我忘了~~~~~哈哈
1 ^, p/ h- [$ r
* v: f* k; H  q; O- H" a7 y! Z0 s# M. S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。
$ w7 z+ V& n3 y! ~( d) I$ T7 a2 ^0 ?

包子

Part of Guide info.:
& R' }+ P7 K1 z/ ]! MThermal Endurance
9 J3 e. t/ M6 [# yThe 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.
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; e( A/ z! B) w( rRTI Elec — Electrical RTI, associated with critical insulating properties.
: i8 \! a3 V  E' B) NRTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
  u! i: _& Q4 N' kRTI 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
, ?/ y! {5 ^, W2 ^甚麼時候看 强度温度, 我忘了~~~~~哈 ...

9 [  K! E& }2 i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，
- |) e$ c: J5 ~6 r! r# ^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
; I; k4 k. _$ O+ {5 g6 x( s) r9 s同一个料，这三个温度通常不会相差太大吧？！

# x% h/ H7 [/ E9 _刚好是150℃还是95℃的问题，