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Posts Tagged ‘film’

Adhesive backing FEP Teflon film

March 4th, 2012 13 comments

Hi all and again thanks to Ahmet ( from the Yahoo group )for sending a sample to me.
I have tested extensively the Adhesive backing FEP Teflon and am abandoning that
route for now. It seems to have the same problem as straight
polycarbonate/nylon/Polyethylene. It is difficult to separate the resin ( at
least mine )without it actually coming off the glass base. You could be using a
different resin with different results, but for my purposes it does not work.

Cheers!

Categories: Resin, VAT Tags: , , , ,

Got DuPont FEP Teflon?

December 11th, 2011 No comments

Got Milk? No?

Got DuPont FEP Teflon then? YES!

First Impressions:

It is a plastic, clear and somewhat like cellophane used in the floral business. There is an adhesive backing version, so
that would be the one to get, but could not find a source for it. In my neck of the woods DuPont does not even import or distribute the FEP film(Fluorinated
ethylene propylene). When you heat it up it becomes more flexible. I wrote about
this in http://3dlprint.com/2011/11/what-will-happen-if-i/.
I had a small sample piece then, now I have a much larger sheet, also thicker.
when I unroll even 5~10cm it is statically charged. It is hydrophobic, rather
resinophobic i.e. it repels resin and forces it to try to minimize the contact
surface.

I placed a drop of resin and spread it around:

as you can see just on its own it tried to form a sphere.

The cured resin is released easier than silicone, but not by that much.

What helps is that it flexes and literally peeled off the cured resin.

There were no ill effects to the film after polymerizing a drop of resin on top of it.

I wiped it with a cotton cloth and then paper towels with Isopropyl Alcohol.

Clearly “THE SECRET” ingredient in a lot of printers.

More to come…

 

Categories: VAT Tags: , , , ,

What Will Happen If I…

November 11th, 2011 2 comments

I know you have asked yourselves this question and the answer resulted usually you ended up in trouble, but maybe not this time.

I decided to check whether the polymerized resin will burn out or melt for casting purposes. I placed some Teflon film ( yes, I have it and will post about it ) on the Ceramic stove top burner. Placed the screw with a blob of resin and raised the temperature slowly.  @100 C -  I saw no change in the Teflon film other that it went soft, but it kept its properties. @120 C, 130 C, 150 C, 180 C, 200 C, same thing except the resin started to get soft when in contact with the teflon film. I broke a piece of the resin and set it on top of the film. Raised to 250 C – the teflon kind of melted and adhered to the ceramic( but was not hard to damage it by moving the piece of resin around ) and the resin started to change color to deep yellow.

Up to 300 C and the teflon is still holding and repelling the resin from ruining my ceramic counter top:

@380 – 400 I gave up since the resin changed color to almost black and no melting has occurred – it stayed the blob shape that I originally broke off.

Scraping the teflon with a putty knife made it into white plastic -like shavings.  It protected the stove top even at the higher temperatures so well that :

 

My wife is never going to know or suspect anything like the above ever happened in the kitchen!

Cheers!

 

Categories: Resin Tags: , , , , ,