Felt pads attached underneath tiles add very little weight and retain flexibility at low temperatures. Very thin layer of room-temperature vulcanizing silicone adhesive is applied to tile. Then felt pad is attached to adhesive. Finally, tile-felt combination is attached to metal surface by means of similar adhesive layer

Leger, L. J.

English

NASA Technical Reports Server

Junp 1975	 B75-10104 
40
NASA TECH BRIEF 
Lyndon B. Johnson Space Center 
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. 
Method of Attaching Insulation Tiles 
S
The problem: 
High-temperature reusable surface insulation 
(HRSI) tiles are frequently used to protect metal 
surfaces from extreme temperature environments 
[e. g., 115 to 1,543 K (-250° to 2,300° F)]. The tiles are 
attached to the metal surfaces using flexible bonds. 
The flexible bonds protect the fragile tiles from strains 
imposed by the metal surfaces. At low temperatures 
[approximately 113 K (-170° F)] the bonds undergo 
glass transition, i.e., they become rigid, losing their 
flexibility. Strain arrestor plates used underneath the 
tiles are not the best answer because of the added 
weight.
The solution: 
Felt pads attached underneath the tiles add very 
little weight and retain flexibility at low temperatures. 
How it's done: 
The illustration shows the new configuration. First, 
a very thin layer of RTV (room-temperature 
vulcanizing) silicone adhesive is applied to the tile 
surface. Next, a felt pad is attached to the adhesive. 
Finally, the tile-felt combination is attached to the 
metal surface by means of a similar adhesive layer. 
The felt effectively absorbs all the strain imposed by 
the surface even at cold temperatures. 
New Configuration Using Felt Pad
(continued overleaf) 
This document was prepared under the sponsorship of the National
	
Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	
information contained in this document, or warrants that Such use 
Government nor any person acting on behalf of the United States
	
will be free from privately owned rights.
.
https://ntrs.nasa.gov/search.jsp?R=19750000104 2020-03-19T20:06:20+00:00Z
Note:.	 Patent status: 
Requests for further information may be directed 	 This invention is owned by NASA, and a patent 
to:	 application has been filed. Inquiries concerning 
Technology Utilization Officer	 nonexclusive or exclusive license for its commercial 
Johnson Space Center	 development should be addressed to: 
Code AT3	 Patent Counsel 
Houston, Texas 77058	 Johnson Space Center 
Reference: T5P75-10104	 Code AM 
Houston, Texas 77058
Source: L. J. Leger
Johnson Space Center 
(MSC-12619)
. 
Categories: 04 (Materials) 
B75-10104
	 08 (Fabrication Technology)


Method of attaching insulation tiles

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