CONFORMAL COATINGS FOR PRINTED CIRCUIT ASSEMBLIES

Abstract

Commercially available epoxy and polyurethane resin conformal coatings were evaluated as protective coatings on glass-epoxy and paper-epoxy Cu-clad laminate printed circuit boards. All the epoxy and polyurethane coatings tested met the following characteristics: (1) suitability for dip, spray on brush coat application, (2) transparency when full cured, (3) cured within 2 hr at 75 C, (4) did not support fungus, and (5) one component system preferred. No blistering, wrinkling, cracking or corrosion was observed; good adhesion to test panels was obtained. The dielectric constant decreased with increasing frequency from 1 to 100 mc. The Q factor of the epox coated boards decreased as compared to the uncoated boards. All coated specimens passed the initial dielectric withstanding voltage test before thermal cycling.

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1961
Accession Number
AD0266884

Entities

People

  • Anthony J. Beccasio

Organizations

  • Motorola Mobility

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Circuit Boards
  • Coatings
  • Dielectric Permittivity
  • Dissipation Factor
  • Electrical Properties
  • Engineering
  • Films
  • Laminates
  • Materials
  • Measurement
  • Printed Circuit Boards
  • Printed Circuits
  • Q Meters
  • Resins
  • Standardization
  • Wear Resistance

Fields of Study

  • Materials science

Readers

  • Electrical Engineering
  • Polymer Science and Engineering.
  • Surface Coatings Technology.