开云体育

I've been designing up some HV testing circuits, and plan to pot the parts that run up to 30 kV. I'm reusing a couple of plastic HV CRT supply boxes salvaged from old HP scopes, such as the 180. The anode multiplier section in these were potted with a beautiful clear silicone goop that was easy to remove, and in like-new condition after fifty years. I'd like to find the same kind of stuff for this new use. Does anyone know exactly what HP used for these back then?

I definitely want clear silicone, electrical/HV grade. I want it clear because I like being able to see into the guts during potting and operation, and I may have an LED buried inside to indicate current flow. I want it silicone so it can be torn out easily for design modifications - and clearness helps a lot with this.

Online searching seems to indicate RTV-11 is probably about right, if it's available in clear. Any other ideas? I see that the RTVs are pretty spendy nowadays, so I'm looking for reasonable prices on small quantity units, say around 250 ml. The volume to be filled is about 5-6 in^3.

PS: An interesting thing I noticed in searching, was some talk about making cheap (and sort of clear) electrical potting compound by mixing hot melt glue sticks into molten parrafin. Has anyone heard of this, or know more info? Something like this may be OK if it's fairly clear or translucent, and can be blended to be pliable enough for easy removal. Flammability isn't an issue here, since the power levels are low, and it's only for temporary testing hookups.

Ed