scofieldzhuo 发表于 2019-11-7 07:53

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？

wangjb 发表于 2019-11-7 08:14

电气、冲击、强度

rocknan 发表于 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.

scofieldzhuo 发表于 2019-11-7 14:31

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

RTI 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？

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~~~~~哈哈

太久了@@

包子 发表于 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。

包子 发表于 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.

scofieldzhuo 发表于 2019-11-9 08:13

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 ...

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 发表于 2019-11-11 14:10

:L同一个料，这三个温度通常不会相差太大吧？！

scofieldzhuo 发表于 2019-11-11 17:20

jiayou 发表于 2019-11-11 14:10
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，
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