carbon filled ptfe datasheet

[pedrof]

I have an assembly which uses a plastic cover subjected to low mechanical loads but also to -40 to +200°C temperature range. It's 150mm diameter by 90mm high.
At the moment we are using 25% carbon filled ptfe, but due to mechanical creep where it is fixed we might use Ertalon 66GF30. Although more borderline on temperature, it seems more stable mechanically.
Any thoughts are welcome but I'm really after a decent datasheet on the carbon filled ptfe that I can use to compare with the quadrant datasheet I found here:

http://epp.quadrantplastics.com/ass...materialdatasheets2/pa/PDSERTALON66GF30EN.pdf

I'm aware there are more exotic materials that may fit the bill but cost is a consideration here.

 

[Pud]

Ertalon 66GF30 is just an ordinary GF grade. 200 deg (imho) would be somewhat optimistic.

Have a look at the PPA based materials - eg Grivory, Zytel HTN, etc. or even PPS (if the tool can be heated to 135 deg C). All comparable in price - should process slightly faster as higher HDT too.

http://www.tynevalleyplastics.co.uk

 

[rodneybennet]

Hi Pedrof,

What is the exact type of Carbon that you are using? Depending on the application variations in size and shape will make a huge difference in creep, thermal expansion behaviour, etc.

In the operating conditions given I would - if possible - stick to PTFE matrix material.

Rodney Bennet

Learn more on CheFEM: Chemical interaction driven FEM analysis of advanced materials

http://www.composite-agency.com/CheFEM.htm

 

[Demon3]

For free mechanical data comparison check

http://www.matweb.com

As stated the aspect ratio and bonding of the carbon fiber to the matrix will affect creep.

Chris DeArmitt PhD FRSC CChem

http://www.phantomplastics.com

Consultant to the plastics industry

 

[patprimmer]

Nothing bonds very well to PTFE and PTFEs creep resistance is truly abysmal.

Th hard grade of Hytrel or Arnitel might do the job. They will certainly do OK at -40C. +200C might present a problem.

Nylon 4.6 (Stanyl) will take 200C standing on its head, but it will struggle at -40C.

One problem with nylons at -40C is that they dry out at those temperatures.

I think this will end up with an exotic like polysulphone, PEEK or PEI. I would need to check dat re their low temperature performance.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

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for site rules

 

[rodneybennet]

Assumed that assembly contained chemicals (in that case I would still stick to PTFE with an optimized filler suggestion)

Rodney Bennet

Learn more on CheFEM: Chemical interaction driven FEM simulation of advanced materials

http://www.composite-agency.com/CheFEM.htm

 

[pedrof]

Thanks for your input on this matter. It looks like we may be able to live with 180 deg C as the maximum temperature which makes Ertalon look more comfortable, so does anyone have any experience on Ertalon 66GF30 at -40 degC? How bad is the drying out that has been mentioned above? This is only acting as an insulating cover, no impact loads to speak of.

As for going to a more exotic material, we did look at Peek and Torlon 4501 PAI coat was ten times that of Ertalon.

 

[patprimmer]

GF nylon 66 will be quite brittle at -40 deg C, however it will be OK so long as it receives no serious impact

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[pedrof]

Just as an update, one suggestion that is supposed to be halfway between Ertlaon and PEEK costwise is Techtron HPV.
I'm going to try and source this and have a part machined to try.

 

[pedrof]

One downside of this Techtron HPV PPS is that Quadrant do it in blue. Anyone know where I can get a PPS material like this but in black? I believe Techtron is a trade name but there is also Ryton.