Thermal Epoxy
in [Design]
|
Prev: 1905 San Francisco
Next: ECL open input default state
From: RST Engineering on 19 Mar 2010 21:47 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
From: D Yuniskis on 19 Mar 2010 22:36 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)
From: Royston Vasey on 19 Mar 2010 22:47 "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.
From: John Larkin on 19 Mar 2010 22:51 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. 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 You don't really need low theta, because you don't care much if the resistor body gets a few degrees warmer. Almost all the heat is going into the mongery anyhow. So use some strong epoxy. Or better yet, clamp it somehow and use some silicone grease, or almost any grease. Epoxy can fail in situations like this. Long stainless pipe clamps are good maybe. John
From: Jim Yanik on 19 Mar 2010 23:43
"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. -- Jim Yanik jyanik at localnet dot com |