Qualitative test involves immersing a coated cable in methyl-2-pyrrolidone and removing it in one to three minutes. Evidence of any cracking, peeling, or other defects that shows under 20-power magnification indicates that the coating has not been completely cured

Uribe, J. R.

Wallauch, J. R.

English

NASA Technical Reports Server

September 1969	 Brief 69-10330 
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. 
Simple Test Indicates Degree of Cure

of Polyimide Coatings 
S
A simple qualitative test has been devised to deter-
mine whether polyimide resins (used as high-tempera-
ture coatings on electrical cables) have been com-
pletely cured. To perform the test, a sample of the 
coated cable is immersed for 1 to 3 minutes in 
normal methyl-2-pyrrolidone (NMP). After immer-
sion, the sample is removed from the NMP, rinsed in 
clean water, and wiped dry. It is then examined under 
20-power magnification for cracks, crazing, flaking, 
or peeling of the polyimide coating. Evidence of any 
of these defects indicates that the coating has not 
been completely cured.
Note: 
This Tech Brief is complete in itself. No additional 
information is available. 
Patent status: 
No patent action is contemplated by NASA. 
Source: J. R. Uribe and J. R. Wallauch of 
North American Rockwell Corporation 
under contract to 
Manned Spacecraft Center 
(MSC-15487) 
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=19690000329 2020-03-16T18:13:51+00:00Z


Simple test indicates degree of cure of polyimide coatings

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