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#163326 - 05/06/07 12:34 PM Dielectric strength of shrink tube?
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
I am sure we have all used and perhaps misused shrink tube.
Does anyone know if this has really been evaluated and what is it really appropriate for?
I am guessing class 2 low voltage but I am not really sure.
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Greg Fretwell
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#163328 - 05/06/07 01:14 PM Re: Dielectric strength of shrink tube? [Re: gfretwell]
Elviscat Offline
Member
Registered: 08/13/05
Posts: 214
Loc: Seattle Washington USA
It looks like at least some is rated at 600V. Click Here for more info
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#163334 - 05/06/07 03:42 PM Re: Dielectric strength of shrink tube? [Re: Elviscat]
JoeTestingEngr Offline
Member
Registered: 11/04/05
Posts: 781
Loc: Chicago, Il.
I'm sure that this is something that we have both used a ton of in our electronics related lives. Even good quality heat shrink can be applied badly. Plus, we can only guess which brand someone else has used. I just bought 4' lengths of 3/64", 1/16", 3/32", and 1/8" in my last MPJA order. The paper label on each length tells me it is "PermaSleeve" polyolefin and is UL & CSA certified @ 600V @ 125 C. But there isn't a single marking anywhere along it's length to clue you in. I often use it in conjunction with clear teflon tubing which I believe has superior dielectric properties.

As an aside, I was recently asked to order some more of the yellow silicone jacketed cable that was used for signal analysis long before I showed up. Imagine my thoughts when I learned that the 1000V rated silicone jacket surrounded a 300V rated pair. OOPS!!!
Joe
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#163344 - 05/06/07 08:07 PM Re: Dielectric strength of shrink tube? [Re: JoeTestingEngr]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
I have probably used a mile or two of shrink. Some has come in engineered "bills of material" in carefully wrapped "kits" and other was ordered from "Hos/digi/all/new/Jam" or "Bob's" electronics. None of them had a listing mark.
I do understand you never shrink a "wild hair" or pointy solder joint but I still wonder what a clean joint shrinked 30-40% is worth. Bear in mind the thickness of the finished insulation depends on the anount of tube you started with. A "close fit" is probably not a good thing.
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Greg Fretwell
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#163513 - 05/09/07 08:19 AM Re: Dielectric strength of shrink tube? [Re: gfretwell]
XtheEdgeX Offline
Member
Registered: 04/17/05
Posts: 116
Loc: Florida
Some types of heat shrink are rated up to 35kv.
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