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Browse Prior Art Database

Modification of Vapor Degreaser to Clean with Alcohol

IP.com Disclosure Number: IPCOM000113284D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Scott, PM: AUTHOR [+2]

Abstract

Existing Ozone Depleting Chemical (ODC) vapor degreasers have been modified to clean flux and contaminants from soldered assemblies with isopropyl alcohol.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Modification of Vapor Degreaser to Clean with Alcohol

      Existing Ozone Depleting Chemical (ODC) vapor degreasers have
been modified to clean flux and contaminants from soldered assemblies
with isopropyl alcohol.

      The modification involves removal of ignition sources (heaters,
refrigeration, and control circuitry) and replacement with a
hazardous area (National Fire Protection Code Class 1 Division 1)
pump and on/off switch.  Intrinsically safe temperature, liquid level
and pressure sensors monitor the machines during operation.  The
respective controllers are located outside the hazardous area
envelope to reduce the amount of high cost Class 1 Division 1 rated
electronics.  Carbon bed and mixed bed deionizing columns
continuously purify the alcohol, while desiccant is utilized to
maintain 5% maximum water content.  See the Figure.

      The modification allows elimination of CFC 113 cleaning with
minimal capital expenditure.  The use of isopropyl alcohol allows
compliance to military specifications without extensive reliability
data generation, waivrers or contract negotiations.