Question about UV filters.

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#22
I got my lexan with UV block at home depot here in the states. It was $8 or $12 US for a 1 ft x 2ft sheet. It can be found in a small section in a rack.

From here, As an amorphous material, LEXAN
polycarbonate changes slowly and in linear fashion with increasing
temperatures up to 300°F (150°C), where the material
begins to soften. Softening continues until it melts at about
420°F (215°C).
 
#25
Interesting thread here.

As mentioned before, Lexan is a polycarbonate. Given its popularity in the US, I can imagine why it's not easy to find in Canada. A couple of unusual avenues you may want to check out are boat shops (used for windows) and car audio shops, who build flashy enclosures, amp racks and such. Custom car shops may also use it for windows.

I'm an optician by trade, we use polycarbonate lenses for eyeglasses. IIRC, our lenses transmit about 1% at 400nm, I doubt Lexan would be much different. It doesn't hold up well against most chemicals, and scratches easily unless a hard coating is applied. I would expect extreme heat to cause warpage and discoloration over time.

Tim
 
#27
I say NEEEE! Lexan can hold its own with UV! You show me some better ir/uv , no u cant!
Click to expand...

Run up a search on Schott glass and you will find the glass that blocks uv.

Here i did it for you: http://www.us.schott.com/optics_devices/english/products/filter/glass_filter.html

They also make the reknown KG glass for Ir.

Ir is better filterd with a cold mirror, glass ir filters are realy a waste of time unless you want to pay big$, and even then that will depend on what grade of filter you buy. Ir filter glass can not cover a ir spectrum as wide as a cold mirror without loosing light, hence why its not nearly as half as effective as a cold mirror. Using lexan with ir properties will certainly melt, ir filters get red hot!

Trev
 
#29
I wish I'd known all this before I bought the Low E. I tried to see how long I could run it in a test I did last night using a 250w MH bulb. After about 2 hours the film on the glass started to scorch. There are also 2 types of Lowe E(Lowe E and Low E squared). Lowe E squared has the double pane and the filter surface is inside, but like Ace said, the glass can't handle the heat so it defeats the purpose.
 
#33
Heya borris, with that lack of information how is anyone suposed to know? there are a large variety of metal halide bulbs on the market, it would be best if you looked up your model on the manufactures web site to see its specs, and to see if it has uv block or not.

Trev
 
#35
i just bought a couple things from sciplus for my projector setup, one of them being a 2" x 2" x 1/8" piece of heat filter glass. it was only a couple bucks, and i had to spend more than $10 for an order (bought their $9.50 projector lens), so i figured a lens, a first surface mirror (only a couple bucks as well), and a heat filter would do it. here's to a cheapie setup!
 
#37
hey for all you Canadians out there..even though home depot told me they had no idea what lexan was...i went there today to get something else...started walking around and guess what i found?!?!? Lexan sheets... its lexan XL10 with UV protection

price was $7.95 for a 11x14 inch piece and $21.87 for a 18X24 inch piece,...all the lexan they had in stock was 0.93 thick....

hope that helps some of you find a solution for UV
 
#38
Why are you interested in blocking the UV and IR?

If you're worried about exposing the viewers to UV just make sure they don't stand in the beam.

As for IR, won't a material that filters such a long wavelength also filter most of the visible spectrum above it?

Still, if you're interested in getting some polycarbonate, the two main mfg of polycarbonate include GE (Lexan) and Bayer (Makrolon). Yes, jet engines and aspirin. In Canada (and most of the world) try GE Polyemers... they used to be the well known Cadillac Plastics.

🙂ensen
 
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