Accession Number:

AD0266884

Title:

CONFORMAL COATINGS FOR PRINTED CIRCUIT ASSEMBLIES

Descriptive Note:

Quarterly rept. no. 1, 10 Jul-31 Oct 1961

Corporate Author:

MOTOROLA INC CHICAGO IL

Personal Author(s):

Report Date:

1961-10-31

Pagination or Media Count:

40.0

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.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Electrical and Electronic Equipment
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE