{"id":814,"date":"2020-08-19T14:48:14","date_gmt":"2020-08-19T06:48:14","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=814"},"modified":"2020-09-09T10:46:15","modified_gmt":"2020-09-09T02:46:15","slug":"how-to-prevent-the-fr4-pcb-bended-and-warped-after-reflowing%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2020\/08\/how-to-prevent-the-fr4-pcb-bended-and-warped-after-reflowing%ef%bc%9f\/","title":{"rendered":"How to prevent the FR4 PCB bended and warped after reflowing\u00ef\u00bc\u0178"},"content":{"rendered":"
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Everyone may know that PCBs are easy to be bended or warped when get through the reflow process. Do you how to avoid this issue? here are some advices your reference.<\/p>\n\n\n\n

  1. Reduce the effect of temperature on PCB board stress<\/li><\/ol>\n\n\n\n

    Due to the “temperature” is the main source of stress for board, so as long as the temperature of the reflow oven reduce the temperature or slow the speed of warming up and cooling down in the reflow oven, the board bending and warping issue can be reduced. But it may be occurring other issues, such as short circuit when soldering. See Best Tech make control for the temperature of the reflowing process.<\/p>\n\n\n\n

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    reflow machine<\/figcaption><\/figure><\/div>\n\n\n\n

     2. Use high Tg plate<\/p>\n\n\n\n

     Tg is the glass transition temperature. The lower of the Tg value, the faster of board starts to soften after finishing reflowing, and deformed of the board become more serious. if use of higher Tg 170 material can increase the ability to withstand stress deformation, but the price of TG170 material is higher. See the stock of high Tg material from Best Tech.<\/p>\n\n\n\n

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    Use high Tg plate<\/figcaption><\/figure><\/div>\n\n\n\n

    3. Increase the board thickness<\/p>\n\n\n\n

    If final application allowed, we recommend 1.6mm thickness to prevent the risk of board bending. Best Tech can provide PCB<\/a> board thickness to 4.5~8.0mm.<\/p>\n\n\n\n

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    PCB board thickness<\/figcaption><\/figure><\/div>\n\n\n\n