445nm laser shield with kapton tape?

Hello, i want to build an enclosure for my 445nm CNC engraver. I have a piece of 3mm acrylic (fluorescent orange) i dont have a 445nm meter but seems to be efective for blocking the 445nm, i tested also a piece of kaptom tape and seems to be also efective (less than acrylic), but if i cover the acrylic sheet with kapton seems to bee very efective. Is anyone able to test the kapton tape properties for blocking the 445nm?

Edited 1 time(s). Last edit at 04/06/2015 05:40AM by villamany.

I thought the same when I found colored filter foil for PAR 56 halogen spots. But is not self-adhesive.
Then I had the idea to use Kapton.

Maybe a double layer of Kapton on clear acrylic will work as enclosure window?
-Olaf

Edited 2 time(s). Last edit at 12/12/2015 04:13AM by o_lampe.

I dont have measurement equipment. But for my eyes the best i tested is translucent red acrylic. Kaptom seems to block also, but no much. I found A4 size sheets of 3mm acrylic on Ebay, i think they could be ok for an enclosure window.

Edited 1 time(s). Last edit at 12/12/2015 03:22PM by villamany.

With the cheap filter foil I could cover the whole printer and enclosure from inside to absorb any reflection before it even finds a way through the window. Kapton would be too expensive to do that.
-Olaf