[Closed] I love copaslip!

its good stuff, my dad has some 20 year old industrial stuff from when he worked down the pit - still does a great job!

Yep, an extra 5 mins spent doing something like that does save hours of cursing & swearing, plus a dose of skinned knuckes 6 months down the line.

I bought a small tube of it about 8 or 9 yrs ago when replacing the rear shocks on my car & I've barely dented the tube - reckon it'll last me another 30 yrs at this rate!!

Copaslip is the worst grease to get on anything that you don't want it on as it's almost impossible to remove.

I have a an old peanut butter jar of it in the garage that I filled up from work 20+ years ago and it's still 3/4 full despite doing squillions of things with it

use it or similar every day inc some high temp variants 😮

I love it coz it smells of cake!!

copper slip corrodes alluminium mind!

Does it tho bud? You got real knowledge of this?

I use it a lot on steel bolts into alloy and never any issues. I have heard it said on here it causes corrosion but no one has ever offered any explanation or evidence.

I use it on motorbikes as well - calliper bolts and that sort of thing as well as all engine screws.

I LOVE GREASE!!!!

Does all copaslip does except sounds less fancy.

Actually lanolin is even better.

Grease?

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I've never heard of copaslip corroding aluminium.
Aluminium air valves bolted to a steel truck or bus chassis will soon turn to white powder where they mate. Copaslip prevents that.

Also remember if you are torquing bolts the copaslip will not give a true reading of how tight a bolt is in. I.e. if you tighten something up to 5NM it is generally expected that this is done dry. and when you use copaslip you will get a few more degrees on a turn before the wrench gets to its setting

I don't use a torque spanner on a bike. Been several debates over torque settings but my understanding is they are set for lightly oiled bolts in general as you should never put bolts in dry. Dry values are too unpredictable. You do need to know which is specified tho - dry or lubed as lubed values are about 20% lower.

TandemJeremy - Member

Does it tho bud? You got real knowledge of this?

I use it a lot on steel bolts into alloy and never any issues. I have heard it said on here it causes corrosion but no one has ever offered any explanation or evidence.

I use it on motorbikes as well - calliper bolts and that sort of thing as well as all engine screws.

Today I had a chat with one of my clients who is an aircraft fastener supplier, they say never use copper grease on aluminium, because of dissimilar metal corrosion. The use duralac and never seez. Used by lotus, boeing, bombardier, airbus and the rest. As a so called materials engineer I think I should have known this, and a quick check in my corrosion books would agree. I do not think is a big problem on bikes though. I've always used it. I think its more of a problem in high stress applications on aircraft.

Cheers toys

a quick google gives about 20 different never seez! one of which is called nuclear grade. Maybe a bit OTT for bikes 🙂 The regular never seez contains copper.
http://www.bostik-us.com/markets/product-assembly/mro/products/default.html#regulargr

every day is a school day on STW. I have never seen copaslip causing corrosion and fasteners coated with it seem to remove easily. I wonder if this is one of those theoretical things that don't seem to have a proactical application on bikes. 😕

TandemJeremy - Member
I wonder if this is one of those theoretical things that don't seem to have a proactical application on bikes.

Like QRs ejecting from front wheels under braking?

I think Duralac is the one. Teej thats what I think, its probably outside the stress/loading corrosion potential and gawd knows how many other factors for it to be a problem on bikes.

nm

Coppaslip is banned from UK power stations incidentally!
On bikes, though it is great.
Have been using it on aluminium engine cases for 20+ years and its magic for preventing corrosion on the threads/bolt interface.

They banned copaslip at my workplace a few years ago (due to the adverse reaction between alloy steel and copper at [u]very[/u] high temperatures) I took home a tin back then, and would estimate that in around 10 years I may need to buy some more 😉

Bolt torque and preload can be approximated by this equation:
T = Fp * K * d

T=Torque, Fp is preload, K is a factor, and d is diameter. So as JonT stated correctly the torque is to apply a preload. Assuming the preload and diameter are fixed at 1, then the variable is K.

Typical K factors

As received, stainless on mild or alloy 0,30
as received, mild or alloy on same 0,20
cadmium plated 0,16
molybdenum-disulphide grease 0.14
PTFE lubrication 0.12

So the lower the K (ie more lubricated) the lower the torque required at the wrench to keep the preload the same.
If the torque is given for the dry condition and you torque it up to the same value lubed, then you will increase the preload on the bolt.

Cheers Toys - Its interesting the coppaslip one. I shall keep an eye out for corrosion.

Druidh why keep flogging a dead horse? - you don't believe this despite clear proof. So what.