Material Suggestions(TEFLON?) for Curing "PUCKS"

[PLCRookie]

I am tring to find a suitable material to make a curing fixture . Adhesive is applied to the part, and the part sits in the fixture after having been assembled. It then goes thru an oven at 500 degrees F for about 15 min. Currently, the fixtures are of unknown material (probably nylon) but I have been advised to use teflon, due to the higher temp. The current fixtures are showing sever signs of deterioration. If teflon, what types of materials would be optimal. Quantity is about 500-600, so cost is an issue(as always). Any recommended fabricators?
Thanks in advance.

 

[patprimmer]

Some very special nylons will tolerate 500 deg F, but all common nylons will melt before that temperature.

Glass filled Nylon 4.6 will take 550 for some time, but it will yellow and degrade and go brittle and crack with age.

I am not sure what DuPonts Zytel HTN will take re heat deflection temperature or continuous use temperature.

Polyetherimide might stand up at those temperatures.

Some Polyether Keytones should take those temperatures, but they are very expensive.

PTFE will work. Glass filled will probably be cheaper and better. Teflon is a DuPont trade name for their PTFE and several other similar polymers.

Why not use aluminium.

PTFE coat it if you need better mould release.

You could try Dotmar or Plastral Trading or JC Ludowici or Unasco for bar stock of various engineering plastics.





Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Compositepro]

Your blocks are probably already teflon. You might want to consider metal blocks with a release coating or a throw away teflon film or aluminum foil to protect them.

 

[PLCRookie]

The current fixtures are NYLON. They are cracked and deformed pretty well. I will try aluminum, but the weight may be an issue. I would also like to try teflon, but i am not very knowledgeable about the material. Are ther any sites that could give me a simple primer on the material? Also, i will have different sets of these fixtures, and i would really like to color code them keep from mixing them up, as they are somewhat similar in apperance. Can PTFE be colored? If so what are the Up/down sides to it. Thanks to all!!!

 

[Demon3]

Teflon can be coloured. It is extremely chemical and temperature resistant. Actually you want PTFE (the Teflon treadename covers three different polymers). For a primer on it search Google or try DuPont's site.

 

[patprimmer]

Do you want PTFE or PTFE coated aluminium

You can get info from DuPont, Asahi, Hoechst (Maybe now Ticona)

A google search for PTFE suppliers may identify more.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.