contact isolating resin or glue

[g2c]

Hello, any recommendation for a resin to isolates reliably wire contacts e.g. two wires soldered together used outdoors?
Preferably something I can buy from eBay
Thanks

 

[Nigel Goodwin]

You question is rather vague?.

I presume what you want is something to protect a join in two wires outside? - how about adhesive lined heat-shrink sleeving?.

 

[g2c]

Thanks. heat-shrink is not 100% impermeable. Please have a look at the example picture, I need same kind of coating. I could then have a heat-shrink above for a better mechanical protection

 

[rjenkinsgb]

The stuff in the picture looks like some form of epoxy or polyurathane resin.
That is used for cable joints, but normally only on large cables.
eg.

RS PRO Grey PUR Potting Compound 500 g | RS

uk.rs-online.com

LVI-1/4 | 3M Resin Filled Cable Joint Kit, Straight Joint Type , 2 x 35 mm², 3 x 16 → 25 mm², 4 x 16 → 25 mm² | RS

uk.rs-online.com

Normal heatshrink is not weatherproof, but the adhesive lined type Nigel mentioned should be, if you select the appropriate size and have a decent overlap on to the cable jacket.

Self-amalgamating tape is also suitable for outdoor weatherproofing.
It needs a protective layer of normal PVC tape over it, if it's in a position exposed to sunlight.

AT7 | Advance Tapes Black Self Amalgamating Tape 19mm x 10m | RS

uk.rs-online.com

Stretch the stuff as you apply it and make sure there are 2 - 3 layers everywhere, including the cable for an inch or two beyond the joint or connector.

It very quickly blends in to itself and becomes a one-piece rubber shell or sleeve over the whole thing.

 

[MaxHeadRoom78]

What I have used in the past is a coating of RTV followed by a covering of heavy wall heatshrink.
When it sets, this generally makes for a water proof join.
Max.

 

[Nigel Goodwin]

Thanks. heat-shrink is not 100% impermeable. Please have a look at the example picture, I need same kind of coating. I could then have a heat-shrink above for a better mechanical protection

Adhesive lined ones are water proof, which is why we use them. As for filling a 'hole' as in the picture, any of the usual potting compounds would do the job (we also use those), or just mix some epoxy resin up and use that.

As rjenkinsgb mentioned, self-amalamating tape is amazing, and makes for a nice water tight joint - we also use that at work

 

[MaxHeadRoom78]

BTW, I used the RTV solution mentioned in immersed Chromalox heat trace wiring.
Max.

 

[Visitor]

To make a watertight connection that will survive submersion in a hundred feet of salt water, roll tight-fitting o-rings on to the cable an inch or more back from the spliced area, and then shrink adhesive-lined heatshrink extending at least an inch past the o-rings over the entire splice.

We used this method for connecting hydrophones for sonar trials. The o-ring provides good contact area for the adhesive.

 

[Click-Here]

I have used "paint on electrical tape" for many things including repairing an outdoor extension cord.
Don't.

It's doesn't last long at all.
Doesn't like sunlight or water, or existing out of the bottle.

 

[g2c]

I was not aware of tubing called "adhesive lined heat-shrink sleeving" and was only aware of regular heat shrink

What does the "lined" stand for in this technology?

 

[Visitor]

"Lined" means the inside of the heatshrink is coated with hot melt glue.

 

[Visitor]

DAFLEX Shrinkable Heavy Wall Adhesive Lined Tubing #SM321

DAFLEX SM321 is a large size, heavier wall, adhesive lined, heat shrinkable tubing with a meltable adhesive liner. When 120°C is applied, the tubing will shrink to 1/3 of its supplied size. As the outer wall shrinks the inner adhesive liner melts & flows.

www.daburn.com

 

[MaxHeadRoom78]

You can get a tube of RTV at any hardware store for $10.00!!
Max.

 

[g2c]

or just mix some epoxy resin up and use that.

Do you mean dual component epoxy glue like 3m's or araldite?

 

[gophert]

I would put any good quality and well-mixed epoxy on it.

Do you mean dual component epoxy glue like 3m's or araldite?

yes! Easy. Just mix well, then mix a bit more. Most people don't mix epoxy well enough.
Use a piece of scrap plastic or metal, squeeze out equal Sized dots. Then mix horizontally, across both dots, then pile up the flattened mess into a pile, stir it again until flat, pile up, repeat until you just start to notice the viscosity build. Then quickly apply.

 

[g2c]

Thanks to all the participents to this thread for your help. I think that the heat shrink sleeve with inner adhesive layer should the the job. Bought few on eBay.

 

[Nigel Goodwin]

Do you mean dual component epoxy glue like 3m's or araldite?

Yes, and potting compounds generally work exactly the same.

 

[g2c]

I don't know what are potting compounds are these fertilizers for flowers pots

 

[g2c]

Got it. The distructive reverse engeeneeing substance