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gharemp
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Join Date: Jun 2008
Posts: 23
Good Answers: 1

Insulating Varnish for Cut Bakelite Surface

11/03/2010 2:27 AM

Hi,

We have bakelite parts for electrical termination for low voltage. We had to cut them with jigsaw.

Exposed surface of cut bakelite can absorb moisture. Can anybody suggest which liquid is recommended to seal this exposed surface to prevent absorption of moisture & lowering of CTI ?

Thanks!
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TonyS
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#1

Re: insulating varnish for cut bakelite surface

11/03/2010 3:05 AM

Bakelite or Tufnell? I didn't think either was hygroscopic, to be honest I don't think varnish would be needed for either.

But I may be wrong.

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gharemp
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#2
In reply to #1

Re: insulating varnish for cut bakelite surface

11/03/2010 3:33 AM

Hi,

Bakelite part under discussion is moulded thermoset plastic - phenol formaldehyde.

Moulded parts have smooth & shiny finish & are less prone to moisture absorption as compared to cut / machined surface. Hence looking for suitable varnish or any other chemical which can be applied on this surface for improvement!

Thanks!
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TonyS
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#3
In reply to #2

Re: insulating varnish for cut bakelite surface

11/03/2010 4:57 AM

http://www.aev.co.uk/ should be able to help. They sell world wide.

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kramarat
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#4

Re: insulating varnish for cut bakelite surface

11/03/2010 7:16 AM

Why not just take a rag and rub some wax on the exposed cut?

Simple, easily obtainable, it will absorb into porous surface and zero dry time.

You could either melt paraffin or use the shoe polish wax that comes in little tins.

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TonyS
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#5
In reply to #4

Re: insulating varnish for cut bakelite surface

11/03/2010 8:04 AM

Good God!
That is the quickest, simplest solution.

Good old boot polish!

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PeterT
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Location: Liverpool, NY
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#6

Re: Insulating Varnish for Cut Bakelite Surface

11/09/2010 12:20 PM

An excellent coating that is often used for electrical insulating purposes, and which will seal out moisture (will also seal it in if you're not careful!) comes from Glyptal - see link below:

http://www.glyptal.com/Glyptal_Product_Data_Sheets.htm

I have used Glyptal coatings to seal edges of bakelite and fiberglas reinforced epoxy board, as well as chips on electrical insulators and bushings, cable terminations, motor or generator windings, etc. The 1201 series is very good for this, as is the 1202 (an actual varnish).

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