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标题: UL黄卡的Elec（Electrical）、Imp（Impact）、Str（Strength）分别要怎么理解？ [打印本页]

作者: scofieldzhuo 时间: 2019-11-7 07:53
标题: UL黄卡的Elec（Electrical）、Imp（Impact）、Str（Strength）分别要怎么理解？
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？

作者: wangjb 时间: 2019-11-7 08:14
电气、冲击、强度

作者: rocknan 时间: 2019-11-7 08:59
RTI Elec — Electrical RTI, associated with critical insulating properties.

RTI 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.

作者: scofieldzhuo 时间: 2019-11-7 14:31

rocknan 发表于 2019-11-7 08:59
" ?* r; N1 `7 I/ [% R/ j( ERTI Elec — Electrical RTI, associated with critical insulating properties.5 P4 M/ y3 [3 r1 e* S7 i

) m( O4 y& k( j! B0 ]3 ?4 @2 h% BRTI Mech Imp — Mecha ...

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？

作者: rocknan 时间: 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~~~~~哈哈

太久了@@

作者: 包子 时间: 2019-11-8 11:11
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。

作者: 包子 时间: 2019-11-8 11:24
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.

RTI Elec — Electrical RTI, associated with critical insulating properties.
RTI 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.

作者: scofieldzhuo 时间: 2019-11-9 08:13

rocknan 发表于 2019-11-8 09:56
2 L/ q2 _) m9 }8 JIT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% c& V% B5 P" G' V
甚麼時候看强度温度, 我忘了~~~~~哈 ...

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。

作者: jiayou 时间: 2019-11-11 14:10

同一个料，这三个温度通常不会相差太大吧？！

作者: scofieldzhuo 时间: 2019-11-11 17:20

jiayou 发表于 2019-11-11 14:10
; F' N% A. _) j% e" j! V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，

作者: jiayou 时间: 2019-11-13 13:32

scofieldzhuo 发表于 2019-11-11 17:202 K/ \# n; y' c5 i" m
刚好是150℃还是95℃的问题，

像这种，从长远品质来讲，建议用95度来考核！

作者: huan0714 时间: 2019-11-25 14:04
如果是基于长期热老化（LTTA）测试获得的RTI，是要依据电气强度、冲击强度、拉伸或弯曲强度的样品，放入一定温度梯度的多台老化箱中测试，通过不同温度下性能衰减的数据，建立寿命曲线，最终推算出来的；不同性能的衰减，对温度的敏感性是有差异的，所以会出现电气强度、冲击强度、机械强度RTI值可能不同的情况。

作者: bub02 时间: 2020-6-10 15:52
电气耐温指数

作者: 食蕉蕉啦你 时间: 2020-9-18 17:16

rocknan 发表于 2019-11-8 09:56
( d4 I& Y, x* z1 {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
5 L" s' z: S2 S5 m甚麼時候看强度温度, 我忘了~~~~~哈 ...

UL反馈，他们都是看最低的那个去判断的。你觉得这样对吗？

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