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

scofieldzhuo

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UL黄卡的Elec（Electrical）、Imp（Impact）、Str（Strength）分别要怎么理解？
& x# g) T0 a" p3 p$ r+ a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.

4 P- D7 \5 G* R8 l9 ORTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
$ M. d1 O- ^) M7 ?! J( G" r
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
RTI Elec — Electrical RTI, associated with critical insulating properties.

4 L6 W1 Z% R5 G1 HRTI Mech Imp — Mecha ...

2 M# a# K$ {% w% h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
" J! q9 m1 r2 h8 y& K/ O2 ^0 [甚麼時候看 强度温度, 我忘了~~~~~哈哈

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。
! T' {; a4 ~9 S# `; R

包子

Part of Guide info.:
Thermal Endurance
The 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.
4 A1 B% c, B( M/ ~5 {) ^) v
! i+ V+ j- q9 F! E6 g9 L( KRTI Elec — Electrical RTI, associated with critical insulating properties.
# p  I4 r; G0 A& p( ~: E1 `RTI Mech Imp — Mechanical Impact RTI, associated with critical impact resistance, toughness, elongation and flexibility properties.
7 P+ R# G" S9 E, h3 C$ ~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
% x, D* |+ u" ^) w" K9 |9 a- J* _! }- wIT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
. ]- {/ Z+ V5 j, q- U甚麼時候看 强度温度, 我忘了~~~~~哈 ...

+ g- f% x8 k# L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
: m$ m0 A8 v; ~, [( V% }/ F同一个料，这三个温度通常不会相差太大吧？！

刚好是150℃还是95℃的问题，