Stiff, Strong, DURABLE Plastic?

[AWAaron]

I'm trying to find a stiff, strong, and most importantly DURABLE plastic. I want it to be poured into shape. I'm using this for a puck that would be melted or Velcroed on to a slide glove (for anyone who doesn't know what this is look here:

http://loadedboards.com/gear/gloves/

). Is there any resource that you could share about a plastic that would fit this description? Thanks for the help!

 

[patprimmer]

It appears this is a bearing to run against the surface of a road or pavement.

Your limiting factor re life is most likely the combination of pressure and velocity and the combination of them melting the puck.

The existing material of UHMWPE is a very good choice if the speeds and pressure are not to high which despite the lack of any data, would seem likely to be the case. I am guessing pressure is applied by part body weight and velocity is something like reached on a fast skateboard.

PE cannot be poured but can be purchased in sheet or block form.

It can also be injection moulded, but be prepared for an investment cost equal to a nice new car.

If UHMWPE is melting or going soft in use, try a nylon 6.6 or even nylon 6 sheet.

If it must be cast, several nylons can be cast from monomer They are nylon 6 and nylon 11 and nylon 12 and maybe others, but it is a very specialised process and you would unlikely be able to do it successfully. There are specialist companies who do it. They are often suppliers to the mining industry. Tooling is cheap.




Regards
Pat
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[dgallup]

Urethanes can be cast and are very wear resistant. They may have too much friction though. I think a lot of skateboard wheels are urethane and they have a lot of grip. There are probably some lower friction compounds available.

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[Demon3]

Pat's suggestions are right on.

Ultrahigh molecular weight polyethylene is a great choice. It's used for hip joints because of lubricity and wear resistance.

Get some in tape from here to try.

http://www.cshyde.com

They can also supply other tapes and sheets that could work. Get some Teflon (PTFE) and some nylon too. Using tapes you can get a feel for what works well. Then just order that as e.g. sheet and trim for use.

Chris DeArmitt - PhD FRSC CChem
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[KENAT]

Depending on budget you could maybe start looking at Polyoxymethylene plastics but the guys above are the plastics experts.

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[Demon3]

POM (Acetal) is a good suggestion KENAT.

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[KENAT]

Oh, and depending what you mean by stiff, you may be able to use a filled version.

(Thanks Chris - I figured there was a good reason one of you hadn't mentioned them though.)

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[btrueblood]

Not to detract from this discussion, but attachment of whatever plastic puck to a fabric/velcro patch is where the real fun happens. There's no realistic way to do so in a casting/injection mold that I can see (well, actually I can, but not for onesy-twosy parts which it sounds like the OP wants and Pat has alluded to), and so it's likely down to an ultrasonic or heat staking process, or some type of adhesive bonding, or more mechanical methods. Not having seen any further detail or comment from the OP, it's all moot anyway, and sounds a lot like a solution in search of a problem, since the gloves are a commercially available item already.

 

[mxs6802]

Have you tried Nylon 6/Nylon 6,6 with some glass filler.

Akro-Plastic Akromid® B3 GF 30 (2472) PA 6 Conditioned, 30% Glass Filled has some of the following properties:
Tensile Strength- 110 MPa/16000 psi
Melting point- 220C / 428F

Quadrant EPP Nylatron® GF30 PA66, 30% glass filled, extruded
has the following properties:
Tensile Strength-93.1 MPa / 13500 psi
Yield Strength- 145 Mpa/ 21000 psi
Thermal Conductivity 0.245 W/m-k

however the choices are numerous and the decision of what type of plastic rests on you