Coating applications include anti-fog protection for deep-sea diving equipment, fire protection helmets, and windows of vehicles used in hazardous environments. Basic coating composition includes liquid detergent, deionized water, and oxygen compatible fire-resistant oil. Composition prevents visor fogging under maximum metabolic load for 5 hours and longer

Carmin, D. L., Jr.

Morrison, H. D.

English

NASA Technical Reports Server

May 1971	 Brief 71-10149 
NASA TECH BRIEF 
Manned Spacecraft Center 	
-4 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Inexpensive Anti-Fog Coating for Windows 
An inexpensive, easily applied coating prevents 
the formation of fog on plastic and glass viewing 
windows. Immediate applications include anti-fog pro-
tection for deep-sea diving equipment, fire protection 
helmets, and windows of vehicles used in hazardous 
environments. 
The basic composition of the coating includes: 
a liquid detergent, deionized water, and an oxygen 
compatible fire-resistant oil. The detergent contains a 
mixture of sulfonated aliphatic mono- and poly-
glyceryl compounds of the general formula 
IHdOH 
RO-I---C --H 
H-v-H 
Lx 
where R is an alkyl radical and X is chlorine, 
hydroxyl or a water-soluble sulfonic acid salt radical. 
The silicone-based oil is a phosphate ester of the 
triaryl phosphate type, preferably a triaryl phosphate 
derived from reacting phosphorous compounds with 
cresylic acid. Other acids may be used, however, 
where flammability is not a consideration. 
The coating is prepared from a composition of 35 
parts commercial liquid detergent, 5 parts deionized 
water, and 4 parts silicone-based oil. The com-
ponents are combined and agitated until the mixture
is completely emulsified. Two thin coatings are ap-
plied to the transparent surface and buffed lightly 
with a lint-free cloth. The composition has been 
used successfully to prevent fogging of visors under 
maximum metabolic load for 5 hours and longer. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Manned Spacecraft Center, Code JM7 
Houston, Texas 77058 
Reference: TSP7I-10149 
Patent status: 
This invention is owned by NASA, and a patent 
application has been filed. Royalty-free nonexclusive 
licenses for its commercial use will be granted by 
NASA. Inquiries concerning license rights should be 
made to: 
Patent Counsel 
Mail Code AM 
Manned Spacecraft Center 
Houston, Texas 77058 
Source: Dorrie Leslie Carmin, Jr., and 
Harry Doyle Morrison of
Brown and Root-Northrop 
under contract to
Manned Spacecraft Center 
(MSC-13530) 
Category 04 
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
Governmtht assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately ownedrights.
https://ntrs.nasa.gov/search.jsp?R=19710000148 2020-03-17T02:24:00+00:00Z


Inexpensive anti-fog coating for windows

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