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SMT electronics assembly manufacturing forum.


Baking oven be kept off with MSDs inside

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#67195

Baking oven be kept off with MSDs inside | 3 September, 2012

Should a baking oven be allowed to be kept off with MSDs kept inside ? Will it attract moisture back after a certain time period ?

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#67204

Baking oven be kept off with MSDs inside | 5 September, 2012

It depends, but I'd guess that as a minimum the floor clock will start when the component returns to room temperature. It's easy to argue that the floor clock starts earlier than that!!! Probably, the floor clock starts a couple degrees lower than the 90*C bake temperature.

The reason you're not storing the devices in a moisture controlled environment is ... ?

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#67208

Baking oven be kept off with MSDs inside | 6 September, 2012

We keep our MSDs in a dry cabinet. We only bake if we suspect we have a moisture issue usually PCBs or large BGAs and then it goes back in the dry cabinet.

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#67213

Baking oven be kept off with MSDs inside | 7 September, 2012

As soon as the oven temp falls below 40 C and the RH rises above 5% then you need to consider that the floor clock will start. Long term storage of devices in an oven is not good for them as it reduced their solderability and can affect their performance. You need to consider switching to a dry cabinet, where you can store all your MSDs indefinitely (providing the average RH is less then 5%)...and the power consumption of a dry cabinet is much less then an oven. Totech dry cabinets can also dry components that have exceeded their floor life so in one system you get dry storage and drying capability and low energy consumption and peace of mind that your devices and pcbs wont have moisture induced reflow damage.

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