SMTA International Conference Proceedings


HOW CLEAN IS CLEAN

Author: Graham Naisbitt
Company: Gen3 Systsems Ltd.
Date Published: 10/24/2010   Conference: SMTA International


Abstract: For over 40 years, the electronics industry has been seeking ways to determine an answer to the thorny old question: How clean is clean?

Meanwhile, others were plotting ways that they could monitor the quality of their production process with specific regard to the presence of ionics (salts) that conspire to cause circuit failure.

They figured that using a blend of alcohol with de-ionised water would be an ideal medium, measuring its conductivity before and after.

Why Alcohol? Because conventional rosin based fluxes used at that time were soluble in alcohol. Why water? Because salt dissolves in water.

So, mix 75% propan-2-ol (IPA) with 25% de-ionised water and use a mixed resin filter (a mixture of Cation, Anion and Chelate) to “strip out” ionics as they pass through the medium.



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