Dave A Posted September 17, 2019 Share Posted September 17, 2019 OK all you crossover whizbangs I see plastic clips, zip ties but never hot melt. Is there a reason for this or is it just habit? Quote Link to comment Share on other sites More sharing options...
Edgar Posted September 17, 2019 Share Posted September 17, 2019 1 minute ago, Dave A said: OK all you crossover whizbangs I see plastic clips, zip ties but never hot melt. Is there a reason for this or is it just habit? Some of the plastic film capacitors have very low melting points. Quote Link to comment Share on other sites More sharing options...
Dave A Posted September 17, 2019 Author Share Posted September 17, 2019 OK so low temp glue sounds better then. Any idea which ones to stay away from? Quote Link to comment Share on other sites More sharing options...
Edgar Posted September 17, 2019 Share Posted September 17, 2019 27 minutes ago, Dave A said: OK so low temp glue sounds better then. Any idea which ones to stay away from? https://www.mouser.com/pdfDocs/nichicon-film-capacitors-white-paper.pdf Polypropylene melts at 169°C/336°F. Polyester melts at 257°C/495°F. Polyethlene Naphthalate melts at 262°C/504°F. Polystyrene melts at 100°C/212°F, which is why they're almost never used any more. Their performance is probably affected at temperatures well below their melting points. My hot melt glue gun instructions claim that it reaches almost 400°F. Quote Link to comment Share on other sites More sharing options...
avguytx Posted September 17, 2019 Share Posted September 17, 2019 "IF" I use hot glue to hold a cap either now or in my past career, it was done primarily using one of those cheap "crafts" glue gun that don't get quite as hot as one of the 3M hot melt glue guns. Years ago, we bought those 3M hot melt guns from upholstery suppliers and seems like they were $150 back in the mid 90's. Those things got the glue so hot that if it got on your skin, it instantly bubbled and took the skin off. It had a crazy hot point. So just basic crafts glue gun from Hobby Lobby is all I use now if there are crossovers on smaller boards, like the CF-3's I had, Dynaco A25's, JBL L100T3, and most every other brand of speakers crossovers I've worked with. DON'T use this 3M gun. (hmm...hasn't changed much in price) Quote Link to comment Share on other sites More sharing options...
Deang Posted September 17, 2019 Share Posted September 17, 2019 Just buy one from partsexpress and then use the sticks made by gorilla glue. Perfectly acceptable. Be sure to clean all surfaces and slightly scuff with some very fine sandpaper (you are only scuffing the teflon tape around the cap). Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 17, 2019 Share Posted September 17, 2019 29 minutes ago, Deang said: Just buy one from partsexpress and then use the sticks made by gorilla glue. Perfectly acceptable. Be sure to clean all surfaces and slightly scuff with some very fine sandpaper (you are only scuffing the teflon tape around the cap). Dave, I don't know if you should listen to this guy or not. He's been seen using zip ties. Quote Link to comment Share on other sites More sharing options...
Edgar Posted September 17, 2019 Share Posted September 17, 2019 24 minutes ago, CECAA850 said: He's been seen using zip ties. What color? Quote Link to comment Share on other sites More sharing options...
mark1101 Posted September 17, 2019 Share Posted September 17, 2019 I always used GE silicone. You could peel them up, peel it off and use them again. 1 Quote Link to comment Share on other sites More sharing options...
billybob Posted September 17, 2019 Share Posted September 17, 2019 Plus one on the GE silicone... 1 Quote Link to comment Share on other sites More sharing options...
erik2A3 Posted September 17, 2019 Share Posted September 17, 2019 I have used silicone since about 1990. Hot glue can become brittle over time -- if that's the route you go, make sure it's designed to stay flexible long-term. I use electrical grade silicone now, which does not cause acidic (corrosive) out-gassing when it cures. 1 Quote Link to comment Share on other sites More sharing options...
Dave A Posted September 17, 2019 Author Share Posted September 17, 2019 3 hours ago, avguytx said: "IF" I use hot glue to hold a cap either now or in my past career, it was done primarily using one of those cheap "crafts" glue gun that don't get quite as hot as one of the 3M hot melt glue gun That's what I have courtesy of my wife who no longer needs it. Seems to work fine. I thought about silicone too but the idea of set forget and work immediately was what I wanted Quote Link to comment Share on other sites More sharing options...
JohnA Posted September 17, 2019 Share Posted September 17, 2019 I've used it, the Wal-Mart craft type. The glue doesn't always stick well to the slick outer surface. Quote Link to comment Share on other sites More sharing options...
muel Posted September 18, 2019 Share Posted September 18, 2019 I've used a lot of RTV sealant for some NEMA enclosure situations. This was to seal circuit boards from exposure to dust and water. I've been curious about the long term effect of RTV on the boards but they have usually been damaged within a couple of years by other causes before I could see any harm from the sealants. Thoughts on RTV? I've been using Dow Corning 732 since this was a gasket type use but 738 might be more appropriate. https://www.modusadvanced.com/hubfs/Brochures-Guides/Dow-Corning-Silicone-Sealants.pdf Quote Link to comment Share on other sites More sharing options...
Deang Posted September 18, 2019 Share Posted September 18, 2019 On 9/17/2019 at 2:41 PM, JohnA said: I've used it, the Wal-Mart craft type. The glue doesn't always stick well to the slick outer surface. Which is why you have to clean and lightly scuff the surfaces. 1 Quote Link to comment Share on other sites More sharing options...
glens Posted September 19, 2019 Share Posted September 19, 2019 Just drill holes and use twine. Quote Link to comment Share on other sites More sharing options...
muel Posted September 19, 2019 Share Posted September 19, 2019 40 minutes ago, glens said: Just drill holes and use twine. Oh here we go! Cotton? Nylon? Polypropylene? Jute? Wait, I've got it... hemp surely sounds best. Quote Link to comment Share on other sites More sharing options...
Dave A Posted September 19, 2019 Author Share Posted September 19, 2019 I am thinking there has to be an acoustically neutral dyed hot glue and will be on the lookout for it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.