I have a 2 mm piece of UV transparent acrylic sheet. The datasheet defines it as 80% transparent at 300 nm. However, when I use it with different temperatures (4-50°C), the transmittance characteristics are totally different. It is much more transparent at higher temperatures.
Does anyone know if this is true - that the light transmittance of acrylic varies with temperature? And what might be the reason?
To be more specific, I am interested in the 250-600 nm wavelength range.