Thermal Epoxy
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From: George Herold on 19 Mar 2010 23:45 On Mar 19, 9:47 pm, RST Engineering <jwei...(a)gmail.com> wrote: > I need to bond a couple of 20 watt metal housing resistors to my > satellite dish to melt snow when it forms. I've found the perfect way > to do it on a relatively flat surface, but there are no attachment > fasteners. > > Is there a good, weatherproof thermal adhesive that will take a bit of > heat out in the weather 365/24/7 and transfer the heat from the metal > resistor housing to the dish ironmongery? That can be had for a > couple of ounces? Without some sort of huge minimum purchase? > > I mean, I need what, a couple of dabs? (Dabs, that's a technical > term, you'll get used to it.) > > Thanks, > > Jim Have you ever tried JB Weld. It's epoxy filled with iron (I think... it's filled with something.) It's strong and takes heat. I used some to patch up some cracks on the engine block of my tractor. Still working after 7+years.... (no water in the oil.) Great stuff, but it is magnetic. George H.
From: Archimedes' Lever on 20 Mar 2010 00:33 On Fri, 19 Mar 2010 18:47:25 -0700, RST Engineering <jweir43(a)gmail.com> wrote: >I need to bond a couple of 20 watt metal housing resistors to my >satellite dish to melt snow when it forms. You should just buy the stuff they wrap around water pipes to keep them from freezing. Also, you should apply "Rain-X" to the surface of the dish. That will allow the stuff to slide right off, once you free it up. > I've found the perfect way >to do it on a relatively flat surface, but there are no attachment >fasteners. > >Is there a good, weatherproof thermal adhesive that will take a bit of >heat out in the weather 365/24/7 and transfer the heat from the metal >resistor housing to the dish ironmongery? That can be had for a >couple of ounces? Without some sort of huge minimum purchase? > >I mean, I need what, a couple of dabs? (Dabs, that's a technical >term, you'll get used to it.) > >Thanks, > >Jim Except that the hi perf stuff you want ALWAYS has a minimum amount, even for the "sample size". The stuff you want is silica filled Stycast, which is a hard epoxy room temp cure, OR you could use Silver filled epoxy that the chip bonder boys use. It is from EPOTEK, and is called H20E. It is, however, also electrically conductive The stycast can be bought in a pint sized container. You want the thermal blue variety, but you also would want to fill it up with a filler that has good thermal properties. The Epotek is VERY expensive. That same pint will likely be over $500. Silver ain't cheap, and fine grained Silver powder costs way more than raw Silver. Anyway, the stuff is by no means cheap.
From: Archimedes' Lever on 20 Mar 2010 00:36 On Sat, 20 Mar 2010 10:47:25 +0800, "Royston Vasey" <royston(a)vasey.com> wrote: > >"D Yuniskis" <not.going.to.be(a)seen.com> wrote in message >news:ho1c48$koi$1(a)speranza.aioe.org... >> Hi Jim, >> >> RST Engineering wrote: >>> I need to bond a couple of 20 watt metal housing resistors to my >>> satellite dish to melt snow when it forms. I've found the perfect way >>> to do it on a relatively flat surface, but there are no attachment >>> fasteners. >> >> I assume the dish is metallic? Do you have any idea what sort >> of metal it is made from? >> >> Is there some reason you can't *drill* a hole into the dish >> for a pop rivet, or other "nearly flat" fastener (there are some >> screw heads that resemble a *nail*)? >> >> Depending on size, you might want to use a greater number of >> smaller (wattage) resistors to spread the heat across the >> surface more uniformly (?). >> >>> Is there a good, weatherproof thermal adhesive that will take a bit of >>> heat out in the weather 365/24/7 and transfer the heat from the metal >>> resistor housing to the dish ironmongery? That can be had for a >>> couple of ounces? Without some sort of huge minimum purchase? >>> >>> I mean, I need what, a couple of dabs? (Dabs, that's a technical >>> term, you'll get used to it.) >> >> Sure! A Dab is two Smidgeons (in the Northern Hemisphere, that is) > >A Smidge is also used in the Southern Hemisphere, though the size of the >smidge is often job dependent. > > The derivative term is "Smidgeon". What was the original? What... Small Pidgeon? Actually, it came from "smite" originally.
From: Archimedes' Lever on 20 Mar 2010 00:37 On Fri, 19 Mar 2010 19:51:34 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >Epoxy can fail in situations like this. That depends entirely on the properties of the particular epoxy being used. Duh.
From: Archimedes' Lever on 20 Mar 2010 00:38
On Fri, 19 Mar 2010 22:43:18 -0500, Jim Yanik <jyanik(a)abuse.gov> wrote: >"Royston Vasey" <royston(a)vasey.com> wrote in >news:6fSdnUdhEryiqjnWnZ2dnUVZ_gudnZ2d(a)westnet.com.au: > >> >> "D Yuniskis" <not.going.to.be(a)seen.com> wrote in message >> news:ho1c48$koi$1(a)speranza.aioe.org... >>> Hi Jim, >>> >>> RST Engineering wrote: >>>> I need to bond a couple of 20 watt metal housing resistors to my >>>> satellite dish to melt snow when it forms. I've found the perfect way >>>> to do it on a relatively flat surface, but there are no attachment >>>> fasteners. >>> >>> I assume the dish is metallic? Do you have any idea what sort >>> of metal it is made from? >>> >>> Is there some reason you can't *drill* a hole into the dish >>> for a pop rivet, or other "nearly flat" fastener (there are some >>> screw heads that resemble a *nail*)? >>> >>> Depending on size, you might want to use a greater number of >>> smaller (wattage) resistors to spread the heat across the >>> surface more uniformly (?). >>> >>>> Is there a good, weatherproof thermal adhesive that will take a bit of >>>> heat out in the weather 365/24/7 and transfer the heat from the metal >>>> resistor housing to the dish ironmongery? That can be had for a >>>> couple of ounces? Without some sort of huge minimum purchase? > >arctic silver or arctic alumina,which is cheaper,but not as thermally >conductive. > >DAGS. And neither are "epoxy". Both remain "wet", and neither have any adhesive properties.. |