Lasertrapper
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Anybody try Permatex 09128 Copper Anti-Seize Lubricant on LFP terminals to lower & maintain connection resistance?
? cheaper copper particle conductive grease
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hwy17
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There was a user here that did some testing to confirm that dielectric grease does not significantly affect connections. The grease will squeeze out of the lug contact patch.
DougfromdaUP
Solar Enthusiast
The best thing you can do to lower contact resistance is apply proper pressure to clean copper terminal and bus bar.
For tinned lugs or nickel plated busses used on aluminum terminals ( lithium cells) I’ve found that anything that contains a conductive substance, be it any metal or graphite may actually become worse in time. I only use “No-Ox Id A special” anti oxidant and not on the threads. Terminal contact surfaces should be cleaned of oxides before assembly. Initially there will be little difference between a dry terminal vs an anti oxidant treated one, however in a humid environment galvanic corrosion can form. The grease’s primary function is to displace moisture laden air while being ph neutral.
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Lasertrapper
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Thanks for the replies!
I guess the answer to my question is no. I'm making connections to qty 4 JK BMS that have two common M6 high current connections on each side. Because this will be a very compact, 16 Li cell, 12V system for my van, I need to minimize width footprint of each BMS, hence have made solid 1/2" copper extensions..... see pic.
The BMS high current connection points are not flat because of manufacturing methods, and I don't think efforts to flatten them mechanically (like filing) would be wise, or fruitful.
So, my copper extensions ARE flat and I'm searching for a way to provide a larger conductive patch between the mating surfaces, hence my interest in a conductive, (but not di-elecric) malleable material between the irregular and flat surfaces.
I do know that the copper anti-seize compound is very effective in preventing corrosion for many years in extreme exposure; I have a MN summer lake home that requires a very long dock... qty 12 eight foot sections, and having steel legs and many steel bolts. About half of the bolts are submerged for 5-6 months in summer, then subject to snow, rain, sand while stored on the beach for the winter. The other bolts are additionally subject to wave activity (!). My father & I assembled these dock sections from new in the early 1980's. The bolts are easily loosened to adjust the dock height to this day!
The anti-seize compound may also be quite heat-resistant as it is used for disk brake pivot points etc.
Would resistance measurement of two, bolted metal surfaces before and after applying the paste, then heating in an oven & repeating the resistance measurement be an appropriate test?
I guess the answer to my question is no. I'm making connections to qty 4 JK BMS that have two common M6 high current connections on each side. Because this will be a very compact, 16 Li cell, 12V system for my van, I need to minimize width footprint of each BMS, hence have made solid 1/2" copper extensions..... see pic.
The BMS high current connection points are not flat because of manufacturing methods, and I don't think efforts to flatten them mechanically (like filing) would be wise, or fruitful.
So, my copper extensions ARE flat and I'm searching for a way to provide a larger conductive patch between the mating surfaces, hence my interest in a conductive, (but not di-elecric) malleable material between the irregular and flat surfaces.
I do know that the copper anti-seize compound is very effective in preventing corrosion for many years in extreme exposure; I have a MN summer lake home that requires a very long dock... qty 12 eight foot sections, and having steel legs and many steel bolts. About half of the bolts are submerged for 5-6 months in summer, then subject to snow, rain, sand while stored on the beach for the winter. The other bolts are additionally subject to wave activity (!). My father & I assembled these dock sections from new in the early 1980's. The bolts are easily loosened to adjust the dock height to this day!
The anti-seize compound may also be quite heat-resistant as it is used for disk brake pivot points etc.
Would resistance measurement of two, bolted metal surfaces before and after applying the paste, then heating in an oven & repeating the resistance measurement be an appropriate test?
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I have been using dielectric grease for nearly 50 years and never had an issue with it or needed to repair a joint I used it on. This has included using it on motorcycles driven out in all weathers with the harness and switches etc unprotected.
Lasertrapper
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Thanks for the reply, I agree & have also had great success with dielectric grease to reduce / eliminate corrosion!
In this case, I want to protect against corrosion AND improve conductivity between irregular surfaces subject to very high current. Dielectric means electric insulator, or at best a poor conductor.
In this case, I want to protect against corrosion AND improve conductivity between irregular surfaces subject to very high current. Dielectric means electric insulator, or at best a poor conductor.
NEW! DeoxIT® L260D and SM22D GREASES: Lithium-Based Grease, infused with DeoxIT® Dx100L.
Finally, a Mechanical and Electrical Grease that Cleans, Deoxidizes, Lubricates & Protects!
DeoxIT® L260D and SM22D Greases contain DeoxIT® Dx100L infused into the formulation. It provides, an additional film on the metal surface to lift off corrosion, improve conductivity and provide a moveable/flexible protective barrier. While the grease is lubricating, the Dx100L is slowly lifting off oxidation and corrosion without harm to metals and plastics. The addition of the Dx100L is important, when and if the grease is disturbed and separates from the metal surface. When the grease is first applied, the infused DeoxIT® Dx100L transfers to the metal and coats the entire surface; sealing and protecting the metal even if the grease is separated from the surface (vibration or mechanical movement). No other grease does this!
Your copper spacers should work fine as long as they reasonably flat. Draw polish/lap and it should be fine. I’ve been very dissatisfied with every metal/conductive dielectric grease I’ve tried. Copper, zinc, silver and graphite and I always come back to the original. I do tin my busses that I make, but don’t see any improvements except for cosmetic (low tarnish). If you are concerned about conductivity of a connection, an internal resistance meter definitely shows a problem when checking across a junction or cable. I do it every time before power runs through.
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