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DYE INDICATORS FOR VISUAL DETECTION OF ORGANIC PROTECTIVE COATINGS ON PRINTED CIRCUIT BOARDS

IP.com Disclosure Number: IPCOM000007309D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2002-Mar-13
Document File: 4 page(s) / 211K

Publishing Venue

Motorola

Related People

Authors:
Melanie Williams Faye Nounou Tom Swirbel

Abstract

A method of detecting organic inhibitor coat- ings (Entek, Protecto, Schercoat) on printed circuit boards was developed to allow visual inspection and identification of defects on incoming boards. Visual detection is accomplished by incorporating select organ& dyes into the organic inhibitor solution prior to coating deposition such that a colored coating is produced. The criteria for dye selection was estab- lished by evaluating various classes of dyes. Solubil- ity in the inhibitor solution and non-reactivity with the metal ions present in the inhibitor solution were found to be critical requirements for dye selection.