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PLEXIGLAS® SHEET LIGHT TRANSMISSION
Visible and Ultraviolet Light Transmission in Colorless Sheet
*The curves in Figure 3 are typical for these materials; however, values can change slightly with formulation modifications and therefore, should not be used for specification purposes.
Plexiglas® sheet absorbs short wavelength ultraviolet (UV) energy, but transmits most of the long wavelength UV (those wavelengths just short of the visible region). The total uv energy absorbed is about 65%.
This unsurpassed UV stability gives Plexiglas® MC and G sheet superb weatherability and makes it the logical choice among plastic materials for outdoor and artificial lighting applications. The absence of visible changes in Plexiglas sheet after prolonged outdoor or artificial light exposure means that no change has taken place in the spectrophotometric characteristics of the material in the ultraviolet and visible range. Plexiglas sheet exhibits an increase in UV absorbance caused by sunlight. Most of the drop in UV transmittance of Plexiglas sheet takes place in the first two years. Absolutely no change occurs in the spectrophotometric curves of these exposed samples between 5 and 10 years outdoors. Plexiglas MC acrylic sheet absorbs 65-70% of all UV rays.
Colorless Plexiglas sheet exhibits the same excellent resistance to discoloration when exposed for 20 years or more to constantly lit fluorescent lamps, even when the Plexiglas sheet is only two inches from the lamp.
Some applications, such as document preservation, call for a filter material that absorbs more UV energy than ordinary glass but minimal visible light. Plexiglas G UF-3 and Plexiglas MC UF-5 acrylic sheet absorbs 98% of all UV rays, as well as a small amount of visible light. Plexiglas G UF-4, developed for mercury vapor lighting applications, can also be used as a protective shield. Plexiglas G UF-4 sheet does transmit slightly more UV energy than Plexiglas G UF-3 and Plexiglas MC UF-5 sheet.
The statements, technical information and recommendations obtained herein are believed to be accurate as of the date hereof. Since the conditions and methods of use of the product and of the information referred to herein are beyond our control, Arkema expressly disclaims any and all liability. NO WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, WARRANTY OR MERCHANTABILITY, OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, IS MADE CONCERNING THE GOODS DESCRIBED OR THE INFORMATION PROVIDED HEREIN. The information provided herein relates only to the specific product designated and may not be applicable when such product is used in combination with other materials or in any process. The user should thoroughly test any application before commercialization. Nothing contained herein should be construed as an inducement to infringe any patent, and the user is advised to take appropriate steps to be sure that any proposed use of the product will not result in patent infringement.
See MSDS for Health and Safety Considerations.
© 2006 Arkema