Looking for heat-resistant films

[simonwei]

Hi,

I'm looking for commercially available films with following properties:
1. Heat-resistant up to 160 oC
2. Surface roughness rms below 1 nm
3. Stand-alone
4. 0.1 ~0.5 mm thick

I've tried some Kapton films but the flatness is not desirable. Can anyone suggest other. Thanks.

simonwei

 

[unclesyd]

What are you inferring when you state "stand-alone"?

What is the size you need?

 

[simonwei]

Hi, unclesyd:

By "stand-alone" I mean the film is independent of a substrate. The size of the film is 1 in. by 1 in..
Thanks.

simonwei

 

[unclesyd]

More questions.
Are you talking about an organic film?
Transparent to what, visible, UV, IR?
Environment?

 

[MikeHalloran]

I'm wondering if you can get glass cover slips that big.



Mike Halloran
Pembroke Pines, FL, USA

 

[simonwei]

Sorry I forgot to mention flexibility is desirable.

simonwei

 

[IRstuff]

Flexibility is the opposite of "flat" You can't have both that the same time.

TTFN

FAQ731-376

 

[MikeHalloran]

You can surely find polycarbonate sheet at the upper end of your thickness range.



Mike Halloran
Pembroke Pines, FL, USA

 

[simonwei]

Do flexibility and flatness defy each other inherently? Or is it more about a matter of how the film is processed? Commercially available Kapton films and PET transparencies are flexible and "look" flat, and I'm wondering if a better processing can bring roughness down to 1 nm rms?
Thanks.

simonwei

 

[IRstuff]

Intrinsically, anything that bends is unlike to return to its "flat" state. That implies that you are actually asking for something else; you say they "look flat", but what exactly do you require, is it "smoothness," as implied by your numerical requirement? Bear in mind that 1nm rms is substantially "flatter" than most flat glass mirrors.

Smoothness requires polishing, either of the forming surface or the finished surface. You can presumably take reinforced Kapton and subject it to polishing. You might want to consult with some optics houses.

TTFN

FAQ731-376

 

[unclesyd]

I would look at the nylons especially the 6/12 variety, Bake-in a Bag, I believe they make them in a 6 mil thickness. i also looked at window film, 8 mil impact, but they fall out as far as temperature resistance is concerned.

The DSM site offers a new material Stanyl that has excellant high temperature properties.

http://www.dsm.com/le/en_US/stanyl/html/gi_apps_film.htm?DCSext.src=search

Solvay has any number of products that could be used.

http://www.solvayadvancedpolymers.com/products/0,,304-2-0,00.htm?WT.mc_id=SAP Google&WT.srch=1

 

[patprimmer]

PC will be quite soft at 160 C as will PET or PBT.

Some nylons will withstand that

Many exotics like sulphones and PEEK and polyimide and polyetherimide will take the heat but are expensive and of limited availability

We still do not know load, time at temperature, other factors in the environment, if it requires transparency or dimensional stability.

The surface finish required is a tough call.

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

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for site rules

 

[ibertestint]

http://www.solvayadvancedpolymers.com/products/0,,304-2-0,00.htm?WT.mc_id=SAP Google&WT.srch=1

Good link, its very useful to me.

Ibertest Internacional S.A. - Materials Testing -

http://www.ibertestint.com