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RAIG Minimizes Corrosion, Allows Higher Gold on ENEPIG
Paper describes a mixed reaction RAIG electrolyte that minimizes galvanic corrosion and allows higher ENEPIG gold thicknesses, enabling robust designs and world-class quality on target with minimal variation.
Uyemura
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Alternative Solvent with Low Global Warming Potential
A new low global warming potential fluorinated solvent for precision cleaning is discussed. The paper covers the properties and performance.
Materials Tech
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Authored By:
R. Basu and R. Hulse
Honeywell International, Inc
Buffalo Research Laboratory
Buffalo, NY 14210 USA
Summary
In the past 20 years the solvent industry has gone through a great deal of change. In the early 1990's, CFC-113 and 1,1,1-trichloroethane were the workhorses of the industry.
The Montreal Protocol, to phase-out substances that deplete the Earth's protective Ozone Layer, was implemented in the mid 1990's to reduce chemicals with ozone depletion potential. After phase-out of the CFC solvents, the solvent industry fragmented to a variety of cleaning solutions.
The electronics industry was a large user of CFC solvents and many of these applications changed to aqueous based cleaners. Some of the industries moved to chlorinated and brominated solvents such as trichloroethylene and n-propyl bromide.
Other industries changed to no-clean fluxes. But those alternatives are now facing various problems: e.g. aqueous based cleaners use a lot of energy, require long drying times, use equipment that requires frequent maintenance, and require a large footprint; no-clean fluxes leave flux residues; and trichloroethylene and n-propyl bromide have toxicity issues. In response to these serious issues newer solvents and blends are being introduced in the marketplace.
In this pursuit the company developed a new low global warming potential fluorinated solvent for precision cleaning. This solvent has a mosaic of properties that make it a good solution in the solvent domain. It is non-flammable, has low toxicity, environmentally friendly, low surface tension, rapid drying, excellent solvency and a number of other favorable properties. In this paper we will review the properties and performance of the new solvent.
Conclusions
In this paper we have described the characteristics of a new solvent 1233zd(E) or trans-1-chloro-3,3,3-trifluro-1-propene which showed excellent promise as a solvent for defluxing and other cleaning applications. It has better environmental and toxicity properties compared with many other solvents in the marketplace today and can be used in vapor degreasers. It is also a stable, non-flammable product with reasonable compatibility with materials. Presently 1233zd(E) registration for solvent and other uses is underway in many countries.
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The Industry Standard Solder Paste
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Indium Corporation
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