Polyurethane foam and cable

[hard-work]

Does polyurethane foam affect electric cable if they come in contact?

thx

 

[JohnW2]

Does polyurethane foam affect electric cable if they come in contact?

No. At least that what the manufacturers of PU foams say, and I've certainly seen PVC cables that have been exposed to it for long periods without any apparent ill effect.

Kind Regards, John

 

[stillp]

Do you mean the expanding foam? If so, some makes can affect the outer sheath of cable. I wrap cables with cling film if using expanding foam near them, just to be sure.

 

[JohnW2]

Do you mean the expanding foam? If so, some makes can affect the outer sheath of cable. I wrap cables with cling film if using expanding foam near them, just to be sure.

I presumed that he meant expanding foam. I suppose your precaution makes sense (unless there is anything that can leach from the cling film that could harm the cable sheath!). However, you will probably recall that, a few years back, I asked a number of manufacturers of expanding PU foam this question and (somewhat to my surprise - I had expected 'backside-protecting' responses!) all said that their product was fine in contact with PVC-sheathed cables.

Kind Regards, John

 

[John D v2.0]

it's polystyrene you have to be careful. I just used plastic conduit through polystyrene insulated walls.

 

[ban-all-sheds]

I presumed that he meant expanding foam.

Seems odd.

Do you have a reason for presuming that when someone mentions polyurethane foam they mean the expanding stuff from a can and not Celotex/Kingspan/Knauf etc insulation materials?

 

[JohnW2]

I see it's Friday night in this thread, too

 

[ban-all-sheds]

It's Friday night in a lot of places.

So having agreed that we both know what day and time of day it is, would you now like to attempt a proper answer?

 

[Taylortwocities]

He did, in post #4

 

[hard-work]

This stuff:
http://www.screwfix.com/p/soudal-window-door-installation-foam-kit-gun-grade/1740h

SOUDAL WINDOW & DOOR INSTALLATION FOAM KIT GUN GRADE
Great value kit for the professional installation of windows and doors. Includes 5 x 750ml cans of B3 PU foam, a compact gun and a can of foam and gun cleaner.

• H-CFC & CFC-Free Propellant
• For Internal & External Use
• Can be Sanded & Painted
• Gloves Supplied
• Controllable Gun Grade Foam
• Professional Kit

 

[ban-all-sheds]

He did, in post #4

No - post #4 was the one where he stated his presumption.

What he has not answered is the question about his reason for his presumption.

 

[flameport]

The foam will not damage the cable, but the insulating effect of the foam will reduce the current carrying capacity of the cable.

 

[JohnW2]

No - post #4 was the one where he stated his presumption. What he has not answered is the question about his reason for his presumption.

Have you nothing better to do with your time? Whatever the 'reason for my presumption', the OP confirmed that it was a correct presumption in post #10.

Kind Regards, John

 

[ban-all-sheds]

Indeed, we now know that it was.

So in post #13 are you confirming that you have absolutely no idea why you presumed it, and that you don't have any interest in why you presumed it?

 

[JohnW2]

This is meant to be a 'leisure activity' but there are times when participating in this forum feels worse than it does when appearing as an expert witness in a Court!