80 SMT007 MAGAZINE I OCTOBER 2019
As shown in Figure 5, both materials per-
formed well, providing excellent protection
against a salt-mist environment, although UR3
delivered a higher overall degree of insulation
resistance, which is in line with the results
from NPL's condensation test.
Summary
To meet the demands of the automotive
industry for greater electronics reliability
under increasingly adverse conditions, Elec-
trolube has developed a range of solvent-
free, higher-performance protective coatings
that can be applied at greater thicknesses to
overcome common application defects while
improving sharp-edge coverage. These materi-
als have demonstrated significant performance
improvements on model PCB test assemblies
in terms of resistance to thermal shock, con-
densing, and salt-mist environments over that
of traditional conformal coatings, ultra-thin
coatings, or even UV curable materials.
SMT007
Phil Kinner is the global business
and technical director of conformal
coatings at Electrolube and an
I-Connect007 columnist. Kinner
is also the author of
The Printed
Circuit Assembler's Guide to…
Conformal Coatings for Harsh Environments.
Visit
I-007eBooks.com to download this and other free,
educational titles.
Figure 5: Insulation resistance of polyurethane materials under
salt-mist conditions with a 50-V bias applied continuously.
