Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


PCB Type

Views: 1366

#42321

PCB Type | 21 June, 2006

Hi, Can anybody help me how to visually identify which is SILVER and IMMERSION SILVER PCB? Your reply on this is ver appreciated. Thanks a lot

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don dawson

#42330

PCB Type | 21 June, 2006

I think all silver on a bare board is Immersion. We are a bare board manufacturer and that is the only silver I'm aware of being used as a finish. What is the problem you are having?

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yme111

#42333

PCB Type | 21 June, 2006

Hi, Thanks for this reply. Our problem is that our customer complained that the pcb that we sent them is not Immersion silver though the actual appearance of the pad is silver. They claim that it is only silver and not Immersion silver. We asked our vendor on this and they said its immersion silver but on the vendor's outgoing report it stated silver from the choices of HAL, silver and immersion silver. Can you advise how we can determine the difference? Thanks again, and looking forward on your response

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don dawson

#42334

PCB Type | 21 June, 2006

I've been building boards for a long time and have never heard of anyone using electrolytic silver. Immersion silver would be 8-18 microinches thick. Plated silver would be significantly thicker (min a couple tenths - .0002" and up). So you may be able to check the thickness. The suppliers cert may be refering to lead free HASL which could have small amounts of silver in it but that would look like HASL.

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