Dear TechNet,
We have been facing the insufficient solder at Chips from Selective soldering. 
When we solder Through hole components, solder volume of Chip pads next to PTH component is reduced, cut-down and these chips are insufficient solder. Although we have applied solder stop material (Pn: 700-1603-000-V, Wondermask 2207-5G, Techspray Solder Stop) to cover these chips but the problem have been happening. We understood that temperature to solder PTH component caused to this problem but we don't know what action for them.

Would you please help us to understand the principle of this insufficient and have any related documents or any advice. We thank advance!

Luan Nguyen.


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Nguyen Hoang Luan
QA Supervisor - IPC Trainer
Spartronics VietNam Co, Ltd.
No.3, Street No.6, VSIP
Th An Dist., BDuong Prov., VN
Tel: (84-650) 784 890
Fax: (84-650) 784 891
Mobile: 090.3.667448
Email: [log in to unmask]
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