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In case you missed it.(Technical Abstracts)

Publication: Circuits Assembly
Publication Date: 01-JUL-08
Format: Online
Delivery: Immediate Online Access

Article Excerpt
Cleaning

"Methods for Choosing a Saponifier or Surfactant for Printed Circuit Board and Stencil Cleaning Applications"

Authors: Ken Wilson, Charles Merz and Aaron Unterborn; ken.wilson@flextronics.com.

Abstract: A discussion of technical challenges associated with the selection...

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...of chemical additives for PCB and stencil cleaning. Removal of residues from fluxes is increasingly causing problems for assemblers. The heat requirements of Pb-free chemicals have made removing residues difficult, and all residues can cause problems with components that have decreased in size and those with increased electrical sensitivity. The problems associated with residues exist with Pb-free and SnPb organic and rosin-based chemicals. Residues from organic chemicals can cause corrosion or lead to electrochemical migration. Residues from rosin-based no-clean chemicals can cause...

NOTE: All illustrations and photos have been removed from this article.

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