[labnetwork] "yellow" film for windows

[Bill Flounders]

Dennis,
I did not find a roll film. I did use a 1/4" polycarbonate sheet.
The manufacturer made a custom color to meet my transmission criteria.

I wanted transmission  <0.01 (my definition of "cutoff")  at 450nm
I wanted the material to look yellow (cutoff between 450 and 480nm)
"yellow" products do not meet this spec. (cutoff ~430nm)
"amber" products meet this spec but I considered them too dark. (cutoff 
is ~550nm)
I requested a custom "double yellow"  product.
(i.e. put 2x the amount of yellow dye in the same thickness product)

What I received was a 3x product - and I liked it.
And it met transmission criteria cutoff was ~470nm
I proposed that the manufacturer
call this custom color  "Golden Bear Yellow 1868"
They had a minimum order requirement to make a custom color
but then cost was equivalent to off the shelf colors.

Manufacturer: Sheffield Plastics
Product: Makrolon

Good Luck
Bill Flounders
UC Berkeley








Dennis Schweiger wrote:
> Good morning all,
>
> we're in the process of upgrading our lighting, and correcting a 
> couple of the "yellow" light issues we've uncovered.  We have windows 
> within our facility that should have been covered, but weren't, and 
> have some currently installed films that don't filter out as much UV 
> as we'd like.  Has anyone recently worked with a film manufacturer, 
> and found someone that can provide a roll stock material that works 
> for them in a glass application, and something they're happy with?  
> The couple of places I've contacted so far are more into architectural 
> films, so they're all over the variety of colors, but when I broach 
> the subject of wavelength filtering to remove UV, it seems that's a 
> "mad scientist" request.
>
> Thank you,
>
> Dennis Schweiger
> Facilities Manager
> University of Michigan/LNF
> 1301 Beal
> Ann Arbor, MI 48109
> 734.647.2055 Ofc
>
>
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> labnetwork at mtl.mit.edu
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