insulating properties of silicone

[captainvideo462002@yahoo.]

Is there any difference in the dielectric properties of clear silicone
and black or some shade of the material? I'm not talking about caulk
but 100 percent silicone like GE Silicone 1 or 2. I use silicone in TV
sets to seal up HV leaks.and repair insulation breakdown. I would
suspect that clear would be the first choice to use but in a pinch
does it really make much difference? Thanks, Lenny

 

[Roy L]

<captainvideo462002@yahoo.com> wrote in message
news:13c69295-9cf2-45c4-b2dc-f8f6e9ccddd6@h18g2000yqj.googlegroups.com...

Is there any difference in the dielectric properties of clear
silicone
and black or some shade of the material? I'm not talking about caulk
but 100 percent silicone like GE Silicone 1 or 2. I use silicone in
TV
sets to seal up HV leaks.and repair insulation breakdown. I would
suspect that clear would be the first choice to use but in a pinch
does it really make much difference? Thanks, Lenny

Oh yes! In my TV servicing days I used to seal the CRT EHT connector
with silicon rubber sealant between the cap and connector, especially
where the set was installed in a mobile home or house where they used
a calor gas type heater. The clear stuff was excellent but I had a
load of comebacks from a short period when I used white bathroom type
silicon sealant. Black tracking marks right acoss the inside of the
cap through the sealant, in one case it was so bad that the arcing had
etched the glass around the crt connector! I only ever used the clear
stuff after that.

Roy

 

On Jul 22, 3:26 am, "Roy L" <Ro...@work.com> wrote:

captainvideo462...@yahoo.com> wrote in message

news:13c69295-9cf2-45c4-b2dc-f8f6e9ccddd6@h18g2000yqj.googlegroups.com...

Is there any difference in the dielectric properties of clear
silicone
and black or some shade of the material? I'm not talking about caulk
but 100 percent silicone like GE Silicone 1 or 2. I use silicone in
TV
sets to seal up HV leaks.and repair insulation breakdown. I would
suspect that clear would be the first choice to use but in a pinch
does it really make much difference? Thanks, Lenny

Oh yes! In my TV servicing days I used to seal the CRT EHT connector
with silicon rubber sealant between the cap and connector, especially
where the set was installed in a mobile home or house where they used
a calor gas type heater. The clear stuff was excellent but I had a
load of comebacks from a short period when I used white bathroom type
silicon sealant. Black tracking marks right acoss the inside of the
cap through the sealant, in one case it was so bad that the arcing had
etched the glass around the crt connector! I only ever used the clear
stuff after that.

Roy

Right but isn't the bathroom stuff "caulk" and not 100 percent
silicone?

 

[Roy L]

<captainvideo462002@yahoo.com> wrote in message
news:eb82eed5-224e-4aad-b87d-5a3cb183178e@24g2000yqm.googlegroups.com...
On Jul 22, 3:26 am, "Roy L" <Ro...@work.com> wrote:

captainvideo462...@yahoo.com> wrote in message

news:13c69295-9cf2-45c4-b2dc-f8f6e9ccddd6@h18g2000yqj.googlegroups.com...

Is there any difference in the dielectric properties of clear
silicone
and black or some shade of the material? I'm not talking about
caulk
but 100 percent silicone like GE Silicone 1 or 2. I use silicone
in
TV
sets to seal up HV leaks.and repair insulation breakdown. I would
suspect that clear would be the first choice to use but in a pinch
does it really make much difference? Thanks, Lenny

Oh yes! In my TV servicing days I used to seal the CRT EHT connector
with silicon rubber sealant between the cap and connector,
especially
where the set was installed in a mobile home or house where they
used
a calor gas type heater. The clear stuff was excellent but I had a
load of comebacks from a short period when I used white bathroom
type
silicon sealant. Black tracking marks right acoss the inside of the
cap through the sealant, in one case it was so bad that the arcing
had
etched the glass around the crt connector! I only ever used the
clear
stuff after that.

Roy

Right but isn't the bathroom stuff "caulk" and not 100 percent
silicone?

Some is, some isnt. The "texture" seems to vary a lot. Some are like
the stuff used for sealing around double glazed window frames i.e.
rubbery, others are definitely pasty in texture. The pasty ones are a
definite no go electrically. However, the white stuff that I used was
the rubbery type. Evidently the white colouring included in it was
enough to promote the arcing. I only ever used the clear stuff after
that and had no further problems. Having said that, I have seen white
stuff used by manufacturers on flyback transformers and EHT rectifier
slabs apparently with no problems.

Roy