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Alternative photopolymer film
Posted: Fri Apr 15, 2022 6:14 pm
by Tekosh
Hey all,
I am aware of Covestro and Zilux films.
But are there any alternative films I can use?
I am looking for the same type of photopolymers that needs no crazy post-processing steps.
Re: Alternative photopolymer film
Posted: Fri Apr 15, 2022 9:47 pm
by jrburns47
Covestro needs nothing except exposure to sunlight. Zilux I think has to be heated. Pick your poison or mix your own from the many recipes available in the literature,
Re: Alternative photopolymer film
Posted: Mon Apr 18, 2022 1:57 pm
by Tekosh
The problem with Covestro is that it's not transparent enough.
I want over 98% transparency. I get 92% right now.
Re: Alternative photopolymer film
Posted: Mon Apr 18, 2022 1:57 pm
by Tekosh
jrburns47 wrote: ↑Fri Apr 15, 2022 9:47 pm
Covestro needs nothing except exposure to sunlight. Zilux I think has to be heated. Pick your poison or mix your own from the many recipes available in the literature,
The problem with Covestro is that it's not transparent enough.
I want over 98% transparency. I get 92% right now.
Re: Alternative photopolymer film
Posted: Tue Apr 19, 2022 2:03 pm
by lobaz
Tekosh wrote: ↑Mon Apr 18, 2022 1:57 pm
I want over 98% transparency. I get 92% right now.
How do you measure transparency, Tekosh? If it is just power after the photopolymer / power in front of, I doubt you can get over about 92% due to Fresnel reflections -- you lose about 4% at both air-photopolymer boundaries. I don't think you can get 98% without antireflective coatings.
Re: Alternative photopolymer film
Posted: Fri Apr 22, 2022 1:30 pm
by Tekosh
lobaz wrote: ↑Tue Apr 19, 2022 2:03 pm
Tekosh wrote: ↑Mon Apr 18, 2022 1:57 pm
I want over 98% transparency. I get 92% right now.
How do you measure transparency, Tekosh? If it is just power after the photopolymer / power in front of, I doubt you can get over about 92% due to Fresnel reflections -- you lose about 4% at both air-photopolymer boundaries. I don't think you can get 98% without antireflective coatings.
I did take off 8% due to reflections. The exposed film seems yellow. I need it close to fully transparent.
Re: Alternative photopolymer film
Posted: Fri Apr 22, 2022 2:02 pm
by jrburns47
Talk to Covestro. If you’re prepared to make a custom order, they’ll make you whatever you want. They may also have limited quantities of custom films already made up. I’m guessing that you wouldn’t be the first customer requesting this.