What is the name of the red rubber like stuff?
- posted
5 years ago
What is the name of the red rubber like stuff?
Glyptal?
piglet
On Sep 2, 2018, snipped-for-privacy@nospam.org wrote (in article ):
It looks like RTV (Room Temperature Vulcanizing) Silicon Rubber. The standard red kind is very widely used, and is a commodity.
Joe Gwinn
Yeah, looks like glyptal.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
Thank you, yes that could be it. Have to take the thing apart and then re-assemble it again. Of course did not have the right size TORX, just one smaller than my set. Been cutting at the red stuff with a stanly knife, it is a mess. Looks like I can get it locally here:
Use RTV162 instead, its not electrically corossive. RTV emits acetic
-acid when it cures.
Cheers
Martin Riddle wrote
Yes, I can find that on ebay, with 20$ shipping from US to Europe. This is the case with many of these products... So I turned the search around, and found this with free shipping:
My first idea was to seal it with hotglue, done that before with plastic... and already have it, not tried on metal.
But for 2 $, I ordered one.
Red rtv is high temperature, if that's what it is. I never saw any evidence of acid causing corrosion.
Greg
Phil Hobbs wrote in news: snipped-for-privacy@supernews.com:
GC has little bottles. If the job is huge or 'industrial' it is sold also in small paint cans.
The GC stuff is like $12
DecadentLinuxUserNumeroUno wrote in news:ptbr67$crl$ snipped-for-privacy@gioia.aioe.org:
sold
oops...
On Nov 24, 2018, DecadentLinuxUserNumeroUno wrote (in article ):
Note that glyptal is not a rubber, it?s a hard enamel varnish. The red rubber is probably high-temperature RTV silicone rubber.
Nor does GC claim that their varnish is glyptal. They say it is some kind of epoxy.
Hmm. The stuff labeled ?glyptal? from Glyptal, Inc. has a similar MSDS. Perhaps, glyptal is only a brand name these days. It used to be a specific resin chemistry, invented by GE.
"Former General Electric trademark for a group of alkyd resins
I guess that the real question is if this red varnish works for the things glyptal was good for.
Joe Gwinn
Joseph Gwinn wrote in news: snipped-for-privacy@news.giganews.com:
In this case and what this is typically supposed to protect against, it all comes down to volts of breech resistance per mil of thickness.
Transformer varnish has a similar function and is of yet another formulation meant to make for easy vacuum impregnation of a taget assembly.
Te red stuff is usually meant as an external, after-the-fact dressing at joint/node locations where testing shows high corona exhibition.
A good HV design avoids such needs as they can be SPOF locations in a circuit. HV nodes are usually a deep probe down a tube, with insulative, non-conductive paste as a seal, and then a real seal a screw down to hold the probe in place. Examining an HV supply one sees the connection on the supply done as mentioned, but the other end... the customer end can even end up being a suction cup over a bare node.
The red silicone RTV mat'l is usually also an add on fix. RTV potting and sealants are usually not red. I see gray and white from General Electric. I am sure other colors are available from other potting matl makers though.
On a sunny day (Sun, 02 Sep 2018 17:12:04 GMT) it happened wrote in :
It is likely Ccb and Cbe going by the size of it, but do not take my word for it.
On a sunny day (Sun, 02 Sep 2018 17:12:04 GMT) it happened wrote in :
It is likely Ccb and Cbe going by the size of it, but do not take my word for it.
PS you can figure that from the text as it mentions the voltages used when measuring it:
Cc collector capacitance IE = ie = 0; VCB = 10 V; f = 1 MHz - 2 pF ^^^^^^^^^^ Ce emitter capacitance IC = ic = 0; VEB = 0.5 V; f = 1 MHz - 11 pF ^^^^^^^^^^^
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.