[TowerTalk] Control and coax cable removal question

[Ron Gorski]

Indeed......why remove them?
N9AU

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Gedas
Sent: Wednesday, October 14, 2020 7:48 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Control and coax cable removal question

Solvents like those mentioned will only affect Polyurethane _before_ it cures. Acetone is esp effective when it is still wet. Once it cures it resists almost all common solvents. A quick search on line mentioned the following (but I suspect these might be hard to obtain and very toxic).

"DMF is the first choice,also DMSO, TMS and dimethyl acetamide maybe used as well, but usually avoided because of toxicity and volatile content. Generally it is hard to dissolve polyurethane as swelling is the common phenomenon observed. May be you can try with mixture of dichloromethane, dimethyl formamide and methanol".

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

On 10/14/2020 3:29 PM, Grant Saviers wrote:
> Try brake cleaner spray, maybe two different brands if needed.
>
> Grant KZ1W
>
> On 10/14/2020 11:19, Al Kozakiewicz wrote:
>> Why remove them?
>>
>> Al
>> AB2ZY
>>
>> -----Original Message-----
>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf 
>> Of bemeier at bellsouth.net
>> Sent: Wednesday, October 14, 2020 2:15 PM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] Control and coax cable removal question
>>
>> In the process of reducing my tower / antenna farm there are now 
>> several control and coax cables that I would like to remove.  The 
>> problem here is they are fed from the outside of the house to the 
>> inside through a PVC conduit which I sealed with spray foam.  (Was a 
>> great idea at the time.  No critters, no hot/cold air, etc. for 14 
>> years.)  However, I can't get the cables out because the foam is 
>> holding them firm.  In addition to the outside / inside conduit, I 
>> also have one between the crawl space and a closet used to route the 
>> cables to the ham shack.   The length of each of these foam dams is 
>> roughly 6".
>>
>>
>> I have tried a long screwdriver and got some out.  I also tried 
>> different diameter crochet hooks but they did virtually nothing.  I 
>> don't have any other mechanical ideas that won't damage the 
>> insulation.
>>
>>
>> Does anyone know some type of a solvent (or other method) that would 
>> dissolve the foam without hurting the insulation on the control / 
>> coax cables?
>>
>>
>> Thanks and 73,
>>
>> Bruce N1LN
>>
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