Home |
Search |
Today's Posts |
#2
![]() |
|||
|
|||
![]()
On Fri, 8 Jun 2012 12:17:28 -0700 (PDT), JIMMIE
wrote: I was thinking about using fiberglass reinforced body filler as an insulator and was hoping someone here may have some experience doing the same. It would be used to support the low impedance end of a gamma match. Power level not to excede 200 watts HF. There shouldn't be much voltage at the gamma match feed point. Which fiberglass filled body putty where you considering? http://3mcollision.com/products/fillers-and-glaze/reinforced-fillers Looking at the various MSDS sheets, it looks like a reasonable insulator that's not going to absorb moisture. My comments and guesswork in [xxxx]: 1,3-ISOBENZOFURANDIONE, POLYMER WITH 2,5-FURANDIONE AND 2,2'-OXYBIS[ETHANOL] 30 - 60% [The volatile solvents.] TALC 10 - 30% [Good insulator. Steatite insulators are baked talc.] STYRENE MONOMER 10 - 30% [Styrene monomer is probably propylene oxide. I couldn't find anything in its electrial properties. My guess(tm) is that it's quite good as styrene plastics are sometimes used as insulators.] MAGNESIUM CARBONATE 10 - 30% [That's chalk. It's hygroscopic and absorbs moisture. It's probably there to remove any water from the talc, which will make talc conductive.] CHLORITE (MINERAL) 1 - 5% [That's a harder form of talc. My guess(tm) is that it serves the same purpose as the soft talc, but is there to help prevent shrinkage during hardening. I'm not sure this is correct.] FIBERGLASS Mixture 1 - 5% [There's the fiberglass filler. Of course, glass is a good insulator. However, I don't think 1-5% fiberglass by weight is going to add much insulating ability to the mix. You might as well use Bondo, without the filler.] FIBER 0.5 - 1.5% [Same as fiberglass] OXIDE GLASS 0.1 - 1.0% [Any of a dozen glass oxides. All are good insulators] -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
nice Philco, forgot pore filler and toning when refinished | Radio Photos | |||
Bosh 636 Automotive Wireless | Boatanchors | |||
automotive noise detector | Homebrew | |||
Automotive Diversity Reception problems- 98 Corvette | Antenna | |||
Automotive GPS Radio Interfacing for APRS use? | Homebrew |