Coef of Friction for ABS/SSteel
Coef of Friction for ABS/SSteel
(OP)
I need a value for the coefficient of friction between ABS and stainless steel please, even a ballpark figure would be enough to get me started. I have had a good look on the net and several plastics site but the mix of plastic metal seems alien.
Any help and sources would be appreciated.
Thankyou
Any help and sources would be appreciated.
Thankyou






RE: Coef of Friction for ABS/SSteel
Decent site:
http
Suggestion: contact ABS manufacturers (BASF, GE Plastics) or conduct your own testing. All you need is a fish scale or a method to determine the angle of a ramp.
Regards,
Cory
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RE: Coef of Friction for ABS/SSteel
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This page specifically gives a value for ABS
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COF 0.5 on dry ground steel; load =0.05MPa; speed =0.6 m/s
There will be no accurate value for ABS because ABS is not one material but is very different depending on grade and manufacturer. For example it is made in very different ways by a totally different process if you compare Dow and BASF ABS. In addition to that ABS made by emulsion polymerisation will contain plenty of residual surfactant (such as stearate) that will act as a lubricant and change the coefficient of friction. Additionally, exposure to water would tend to leach out the surfactant leading to a changes in coefficient of friction over time.
As ABS is rubber in SAN you might look for values for SAN and assume ABS is similar.
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Coef of Friction for ABS/SSteel
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A digital spirit level. Just increase the angle until it slides.
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Coef of Friction for ABS/SSteel
Regards,
Cory
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RE: Coef of Friction for ABS/SSteel
What would you estimate the coef to be in that combination.
RE: Coef of Friction for ABS/SSteel
Regards,
Cory
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RE: Coef of Friction for ABS/SSteel
We can change the injection moulding and we are considering UHMW polyethylene (0.12). PTFE (0.04)and PFA (0.06) are too expensive and bring other problems. The shaft can be specified with chrome plating (0.13). I expect that combination would give us a static coef in the area of 0.15 which is our next comparison.
We can also consider turning the shaft in PTFE or similar but metal is preferred because of the vendor.
Can you suggest other combinations that wont break the bank.
RE: Coef of Friction for ABS/SSteel
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The PTFE is carried in a solvent so that you can spray it. So if you use ABS be careful to test it to make sure the solvent doesn't induce environmental stress cracking in the ABS. A test would be to spray it on the ABS, let it dry, then hit it and see if its impact resistance is retained after exposure to the solvent.
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Coef of Friction for ABS/SSteel
Many thanks to you all. That was really useful and I do appreciate your help.
Chriscad
RE: Coef of Friction for ABS/SSteel
It is a lot harder and a bit heavier than the materials you have mentioned.
It is relatively cheap, easy to mould, has very low static friction (your problem will be static, not dynamic friction) and has a self lubricating surface. It is also resistant to virtually all solvents.
It can be improved by the addition of PTFE powder and silicon oil to the compound, but at a cost of course.
It performs particularly well with nylon as the other surface. Molybdenum disulphide and graphite works well at improving bearing qualities of nylon.
As nylons swell a little on absorption of moisture, this should be taken into account with the design if nylon is used for one component.
DSM Engineering Plastics, LNP, and RTP Company all have tribology data on a large range of polymers in contact with other materials. Reading the data will reinforce the need to test as the numbers change a lot with variations in conditions
Regards
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RE: Coef of Friction for ABS/SSteel
I have tried it in PP, SAN and ABS and it works very well at low addition levels. Because it's UHMW you don't get migration issues like you do with low molecular weight silicones. Wacker has some analogous products.
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If you don't find the ABS masterbatch then e-mail to Multibase, I know they have it.
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Coef of Friction for ABS/SSteel
RE: Coef of Friction for ABS/SSteel
http://www.graphalloy.com/html/bushlist.htm
or:
http
TTFN
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