Coating for electronic components used in space applications has bacteriostatic qualities capable of hindering bacterial reproduction, both vegetative and sporulative viable microorganisms. It exhibits high electrical resistivity, a low outgassing rate, and is capable of restraining electronic components when subjected to mechanical vibrations

Bland, C.

Le Doux, F. N.

English

NASA Technical Reports Server

December 1967	 Brief 67-10599 
NASA TECH BRIEF	 1 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Bacteriostatic Conformal Coating for Electronic Components 
A coating has been developed having bacteriostatic 
qualities capable of hindering bacterial reproduction, 
both vegetative and sporulative viable microorga-
nisms. Additionally, this coating is compatible with 
electronic components used in space applications in 
that it exhibits high electrical resistivity, a low out-
gassing rate, and is capable of restraining electronic 
components when subjected to mechanical vibrations. 
Used with electronic components and assemblies, it 
generally involves the application of a thin coating 
comprised of a polymeric epoxy compound, a mono-
meric epoxy compound, a polyamide resin, and an 
organic amine curing agent. 
The coating technique is accomplished by first 
preparing a mixture of the polymeric epoxy resin with 
the polyamide resin and curing agent, and incorpo-
rating the monomeric epoxy such as allyl glycidyl 
ether in such proportion that the resultant compound 
may be applied to the electronic components or 
assemblies by standard brushing, dipping, or spray-
ing techniques. After coating, the items are cured at 
appropriate temperatures to achieve the desired 
consistency. More than one coat may be applied with 
additional curing cycles after each coat, the finished
product to preferably have a coating thickness of from 
0.005 to 0.010 inch. 
The coating, being bacteriostatic, inhibits the 
bacterial reproduction of microorganisms such as 
Bacillus subtilis, var. niger, Staphylococcus aureus, 
Pseudomonas alcaligenes, Corynebacterium SSP, and 
others. It, thus, advances the state of the art in 
biological decontamination by ensuring that electronic 
components and assemblies in spacecraft going to 
other planets will carry only a minimum of Earth-
originated viable bacteria. 
Note: 
Inquiries concerning this invention may be di-
rectedto:
Technology Utilization Officer 
Goddard Space Flight Center 
Greenbelt, Maryland 20771 
Reference: B67-10599 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington,. D.C. 20546. 
Source: F. N. Le Doux and C. Bland 
(XGS- 10007) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United. States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19670000598 2020-03-11T21:29:10+00:00Z


Bacteriostatic conformal coating for electronic components

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