PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post11220.html
. Then they inserted vias through the Thermal Pad and the holes sometimes intersected the Paste Mask. The thermal pad solder mask was 1
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post10556.html
. The thermal pad solder mask was 1:1 scale of the thermal pad. During reflow the paste would melt and travel down the via holes. The PCB designer might have created a fabrication note to plug the holes on the Thermal Pad not knowing that it would increase cost by 10 - 15
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2154&OB=ASC.html
. Then they inserted vias through the Thermal Pad and the holes sometimes intersected the Paste Mask. The thermal pad solder mask was 1
Lewis & Clark | https://www.lewis-clark.com/product-tag/technical-devices-nuera-jr-wave-solder/
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| https://www.eptac.com/faqs/soldertips/soldertip/solder-pot-maintenance-and-dross-removal
. Larger machines tend to generate more dross, so solder levels should continue to be monitored. More SolderTips What’s with the expiration dates on solder paste or wire? Accept or Reject
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