Optical properties of Acrylic at elevated temperatures

[andyhodgkinson]

I am in a situation where I have a 40mm thick piece of Acrylic between two polarizers. My problem is that the acrylic turns birefringent at around 35 deg C, and optical performance is badly degraded. I have contacted Ineos about Perspex, but it is not available in the right thickness in the US. DOes anyone know of a material with similar optical performance (>90% transmissivity, ~1.5 refractive index, with superior thermal characterisitcs.

Thanks
Andy

 

[tedg]

Try ATOHAAS North America Inc 800 523 1532 or 215 785 8290.

Other possibilities: Cyro Industries 203 795 6081

ICI Acrylics 800 386 2175

Good Luck

 

[federau]

Why you do not take e.g. from the company BULKHEAD to glass in Mainz. With plastics you have always the problem with the high thermal expansion.
Sincerely
Heinz Federau
federau@web.de

 

[gambro]

Try TOPAS from TICONA. It is a cyclo-olefinic copolymer with excellent optics and a high glass transition temperature and a low thermal expansion, so I assume this would solve your birefringence problems.