GLUE for connectors - Page 1
Forum section: electronics / repair

author: Blisk
author_rank: Regular Contributor
timestamp: September 23, 2025, 01:01:22 pm
content: HiI have this white glue on connectors, so they are vibration resistant. It is white glue, a bit soft and it stick to connectors verry hard I can get it of only with solder.Now I want to buy that glue so I can glue it back together after I repaired item.Can anyone help me with this? I want to use if it is possible almost the same glue.

author: Phaseseeker
author_rank: Regular Contributor
timestamp: September 23, 2025, 01:05:55 pm
content: It's usually some kind of NEUTRAL cure RTV silicone, neutral here being very important because a lot of silicone stuff is acid-based and will corrode your connector pins...

author: Kjelt
author_rank: Super Contributor
timestamp: September 23, 2025, 01:07:54 pm
content: Which is also fine as long as you take good care it does not make contact with anything metal.

author: jpanhalt
author_rank: Super Contributor
timestamp: September 23, 2025, 01:07:55 pm
content: Is it a thermoplastic (e.g., hot melt)? Hot melt will melt and reform as the original. Thermosetting plastics (like epoxy) can melt but the original will not reform. The original is chemically degraded.Have you tried IPA to remove it? IPA (isopropyl alcohol) wicks in and greatly decreases the bond strength.

author: Blisk
author_rank: Regular Contributor
timestamp: September 23, 2025, 01:22:43 pm
content: I tried to melt it but it doesnt melt just soften so I can pull it off

author: BILLPOD
author_rank: Frequent Contributor
timestamp: September 23, 2025, 01:42:12 pm
content: Good Morning Blisk, here is a site that explains glue types, it is far from comprehensive, but may be of help:https://www.architecturelab.net/types-of-glue/:popcorn:Good luck.

author: Blisk
author_rank: Regular Contributor
timestamp: September 24, 2025, 06:56:44 am
content: thank you for that.But I really like to know what people here use for repairing electronics and sealing connectors and wires

author: tooki
author_rank: Super Contributor
timestamp: September 24, 2025, 07:19:27 am
content: Quote from: Kjelt on September 23, 2025, 01:07:54 pmOnly if it’s not in a confined space so the acetic acid can readily dissipate. So you don’t want to use the acetic acid type (acetoxy cure) to seal an enclosure, for example.

author: Kjelt
author_rank: Super Contributor
timestamp: September 24, 2025, 07:30:31 am
content: Quote from: tooki on September 24, 2025, 07:19:27 amCorrect and also not to mount largerelectrical capacitors to the pcb for mechanical stability.But in the mentioned case for plastick connectors and if no other glue is available it is not that critical, but indeed not preferred choice.

author: Blisk
author_rank: Regular Contributor
timestamp: September 24, 2025, 07:49:19 am
content: here are a list of glues, but which one to select I think those RTV should do, but still which one?https://www.digikey.si/en/products/filter/glue-adhesives-applicators/909?s=N4IgTCBcDaIEoBUBqACA5gGwK4FMQF0AaEAVilAAcoBGYiqyMEgX2aA

author: Phaseseeker
author_rank: Regular Contributor
timestamp: September 24, 2025, 08:27:27 am
content: Personally I'd stick with those that specify non-corrosive. Looking at some at the datasheets it actually explicitly says stuff likeQuote

author: jpanhalt
author_rank: Super Contributor
timestamp: September 24, 2025, 09:31:43 am
content: Quote from: Blisk on September 23, 2025, 01:01:22 pmThat description (underlined) sounds like a hot melt one often sees in electronics from China and elsewhere. Epoxy is usually quite hard (you cannot indent it with a fingernail). Silicone is usually softer (easily indented with a fingernail). Hot melt is in between. Removal "with solder" doesn't really say much. Silicone will not melt. It will decompose at high temperature. Epoxy decomposes and gets soft at lower temperatures. Hot melts can vary but reharden when cool. Another adhesive not mentioned is polyurethanes. They can be hard or softer and bind well to clean metals. They decompose with heat.A picture will help. Do you need a rigid mount or just something to keep it from flopping around? If the connector has fine pins soldered to the board, you might want something more rigid than silicone. The advantage silicone and hot-melt have over epoxy is peel strength. They can detach partially but still hold. Epoxy tends to let loose once part of the bond breaks.Bottom line, please post a picture or give a more detailed description of that the "white glue" was. BTW, in the US,"white glue " out of the context used here usually means a PVA glue that is soluble is water before curing. I am pretty sure that is not what was used in your instance.

author: Blisk
author_rank: Regular Contributor
timestamp: September 24, 2025, 09:48:21 am
content: Hiit is not epoxy, because it is a bit soft and with solder I didn't melt it but make more softer so I can remove it.Epoxy is too hard. I hope it will stick "forever", not to unglue itself after a few years like it is with hot glue.there are also connectors guled together so vibrations dont take it apparthere is pic.after a 2 hours of uploading pic still didnt manage it so I uploaded it elswhere and here it is.

author: cozza
author_rank: Regular Contributor
timestamp: September 24, 2025, 08:51:03 pm
content: Kafuter K704 (white liquid silicone) and K-704B (black liquid silicone) works for me. Easy to find on Aliexpress. Liquid consistency in a small tube with a fine applicator. Used in a lot of Chinese manufactured film lights to lock connectors, and seal wires into waterproof assemblies.

author: jpanhalt
author_rank: Super Contributor
timestamp: September 24, 2025, 10:41:49 pm
content: That picture tells a lot. (BTW, posting images here has always been a hassle. You are not alone.) The dullness does not look like a hot-melt or silicone, but rather some two-part, flowable flexible polymer. This is not it, but I suspect it is something like this:https://www.3m.com/3M/en_US/p/d/b40066469/3M makes great stuff, but its prices to consumers are equally great, and finding a distributor who will sell to you may be difficult. If you can find a highly flexible epoxy that's affordable, I would consider it.However, if you just want it to work, I would consider a neutral cure white silicone or hot-melt. I would go with a hot-melt for the connector as it is stiffer. A two-part polyurethane* might be better for the connector, if you can find it. For those wires, almost anything already mentioned that is flexible will work.*When say two-part polyurethane, I mean something that doesn't cure with atmospheric moisture and produce gas that cause bubbles, e.g., like original Gorilla glue. You may find something in automotive stores for sealing windshields that will work.