On 7/23/2012 5:31 AM, Jim Thomson wrote:
> Date: Sat, 21 Jul 2012 19:17:54 +0000
> From: Manfred Mornhinweg <manfred@ludens.cl>
> Subject: Re: [Amps] Silicone hose from Flex Technologies
>
>
> When you need custom silicone parts, such as tube chimneys, they can
> often be made completely from RTV sealant. Just find or make a suitable
> form, smear sealant into it, let it set, then remove the form.
>
> I have made many small silicone parts by making forms on a lathe and
> filling them with RTV sealant. Polyethylene is a perfect material for
> those forms: Inexpensive, easy to work with, and it doesn't adhere to
> silicone, so it's easy to remove the cured silicone piece from the form.
>
> For those tube chimneys, you can use any suitably sized tubing or rod as
> form, wrapping it in polyethylene film (cheap from the hardware store)
> to avoid adhesion. Then you smear RTV sealant over it, using a spatula
> to get a roughly even thickness and trying to avoid air bubbles. Don't
> worry about the ends, just make your silicone hose long enough. When the
> sealant has set, you can trim off the excess length, obtaining a nice
> clean finish.
>
> I have never tried these RTV silicone pieces in the microwave oven, but
> I have used them in radio equipment without observing any trouble.
>
> Manfred
>
> ## You would need one heck of a lot of silicone to make one sheet for a
> chimney. Just buy the silicone rubber sheets from mc master carr in the usa.
> You roll it into a cylinder.. then use silicone rubber glue to glue the
> edges.
> Silicone rubber glue looks sorta like regular RTV glop.... but is high temp
> stuff,
> made for gluing silicone rubber sheets. The sheets are reddish colour.
> They will
> take a huge amount of heat. the sheets are also used in exhaust systems on
> trucks etc.
Engine baffles for air cooled, aircraft piston engines and those run hot.
73
Roger (K8RI)
> You can also get flexible silicone rubber hose... in large diam too.... used
> for front brake cooling
> on high performance cars. ( see it up to 3” so far). Alpha uses rolled up
> sheets too.
>
> later..... Jim VE7RF
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