Teflon contact material with highest Co-ef of friction (D&S)

[Robbyod]

Hi all,
Im looking for a material with a high (relative to teflon on steel) co efficient of friction on teflon.

I have managed to find (google)
0.04 steel-teflon
0.44 brass-teflon
0.24 Aluminium-Teflon

but i would like some more options and i am unsure of the accuracy of the above results.

Material chosen will be used in a push/feed wheel for teflon tubing which must rely on friction to function. I would prefer not to have to knurl the wheel so the co-ef of friction will be critical.

It will also have to feed exact lengths of teflon so will be stopping and starting a lot.

Any recommendations?

Thanks in advance

 

[MikeHalloran]

Polyurethane.

You may still be screwed.
Try to strip some teflon-insulated wire.
Note how you need three wraps around something to keep it from sliding.



Mike Halloran
Pembroke Pines, FL, USA

 

[Demon3]

Note that Teflon is not one distinct material but a family of at least three chemically different fluoropolymers marketed by DuPont under one name.

You are probably referring to PTFE. Just wanted to give you a heads-up so that you can make sure the numbers you are using are the right ones, i.e. that they really do apply to PTFE and not some completely different polymer.

Chris DeArmitt PhD FRSC CChem

http://www.phantomplastics.com

Consultant to the plastics industry

 

[tr1ntx]

Does it have to be metallic, or can it be a soft rubber/polymer wheel on a metallic core?

 

[Demon3]

Good idea just blast a metal wheel to add a light, non abrasive texture or coat a metal wheel with rubber, possibly adding some silica into the rubber formulation to increase grip.

Chris DeArmitt PhD FRSC CChem

http://www.phantomplastics.com

Consultant to the plastics industry

 

[Robbyod]

Yes it is PTFE,

Any durable material will do or likewise a non chemically applied coating/layer (Mechanically secured) on a different base material would do

Im trying to keep the solution as simple as possible.

Manufacturing Engineer
Clonmel, Ireland

 

[xqv]

Use a grinding wheel: simple, readily available, wheels with different coarseness are available