四、处理后PCB存放寿命(Shelf Life Of Processed PCB) 温度Temperature 20~30℃,湿度Humidiry 40-70%. 状态描述 可存放时间 成膜后 未包装前 7天(最佳3天) 包装后 未使用前 12个月(回流焊建议使用真空包装) 包装开启后72H一次焊接48H二次焊接36-48H三次焊接前 ...
1. How can I tell if a Flex PCB has exceeded its shelf life? While it’s not always visually apparent, signs that a Flex PCB may have exceeded its shelf life include: Discoloration or tarnishing of surface finishes Stiffness or brittleness of the flexible substrate Delamination or separation...
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Shelf life of PCB / PWBQ. I am trying to find statistics about the shelf life of various printed circuit board finishes. We are interested in data on how the different finishes affect the shelf life. I have been unsuccessful in searching the web. Especially interested with HASL, Immersion ...
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Proof of Life:Versal 诞生的证据 Proof of Life:Versal 诞生的证据 2019-07-02 12:04:48 PCB板上为什么要“贴黄金” 随着IC的集成度越来越高,IC脚也越多越密。而垂直喷锡工艺很难将成细的焊盘吹平整,这就给SMT的贴装带来了难度;另外喷锡板的待用寿命(shelf life)很短。 2023-12-07 11:35:48 ...
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