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Types Of Heat Shrink Tubing

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dvanlanen

Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI

Posted: Thu May 29, 2008 11:53 am Post subject: Types Of Heat Shrink Tubing

In shopping online for heat shrink tubing, I noticed that there are many different materials used in their manufacture – polyolefin, neoprene, PVC, Kynar, Viton, etc.  Does the material type matter?  Are there any that I should avoid?     [quote][b]

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bob(at)bob-white.com
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Posted: Thu May 29, 2008 12:26 pm Post subject: Types Of Heat Shrink Tubing

On Thu, 29 May 2008 14:50:42 -0500

"Dave VanLanen" <davevanlanen(at)sbcglobal.net> wrote:



 	  Quote: 	
		   In shopping online for heat shrink tubing, I noticed that there are many

 different materials used in their manufacture - polyolefin, neoprene, PVC,

 Kynar, Viton, etc.  Does the material type matter?  Are there any that I

 should avoid?



 
	


The two most common varieties are polyolefin and PVC.  The PVC shrinks

at a lower temperature and may even shrink a little sitting around.

The polyolefin shrinks at a higher temperature, and will usually be

slightly larger than it's nominal size until you shrink it.  The PVC is

quite a bit cheaper.



I haven't used any of the others.  I believe Kynar is for higher

temperature use.  I don't know what special purpose the others might be

used for.  I did run across this web site which briefly describes

several different types:

http://www.insulationplastics.com/heatst.htm#202



Bob W.



-- 

N93BD - Rotary Powered BD-4 - http://www.bob-white.com

3.8 Hours Total Time and holding

Cables for your rotary installation - http://roblinstores.com/cables/

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etienne.phillips(at)gmail
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Posted: Thu May 29, 2008 12:46 pm Post subject: Types Of Heat Shrink Tubing

On 29 May 2008, at 10:18 PM, Bob White wrote:

 	  Quote: 	
		   The two most common varieties are polyolefin and PVC.  The PVC shrinks

 at a lower temperature and may even shrink a little sitting around.

 The polyolefin shrinks at a higher temperature, and will usually be

 slightly larger than it's nominal size until you shrink it.  The  

 PVC is

 quite a bit cheaper.




	


Hi all



I was wondering about this very question this afternoon...



Isn't it a bad idea to use PVC in aircraft wiring - even if it's just  

for labelling? 100' of PVC is not an insignificant of cyanide- 

generating plastic when it catches fire...

I'm currently using PVC all over my wiring harness, but after reading  

about the dangers of PVC insulation, I'm definitely chucking it out  

when the panel is re-born!



Etienne

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Thu May 29, 2008 4:58 pm Post subject: Types Of Heat Shrink Tubing

At 12:50 5/29/2008, you wrote:

  	  Quote: 	
		  In shopping online for heat shrink tubing, I noticed that there are many different materials used in their manufacture – polyolefin, neoprene, PVC, Kynar, Viton, etc.  Does the material type matter?  Are there any that I should avoid? 	


 PVC insulated cable is generally not used in aircraft, nor should PVC shrink be used.

 Polyolefin is of higher quality.

 Kynar, aka polyvinylidene fluoride (PDVF) is generally required for mission critical applications and where outgassing is an issue, but is a bit less flexible but much more resistant to abrasion and splitting.



 Use clear so the joint can be inspected, unless you need to hide your work.



 Most shrink is 2:1, but 3:1 is available. 



 Here is a link to the Bible of harness assembly

  http://tinyurl.com/5y5jkz 



 Good stuff starts around Chapter 9, pdf page 43.



 Another brief link to standards

  http://workmanship.nasa  .gov/lib/insp/2%20books/links/sections/files/appendix.pdf 



 Ron Q.



     [quote][b]

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