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Acrylic sheet refractive index.
Poly methyl methacrylate pmma also known as acrylic acrylic glass or plexiglass as well as by the trade names crylux plexiglas acrylite astariglas lucite perclax and perspex among several others see below is a transparent thermoplastic often used in sheet form as a lightweight or shatter resistant alternative to glass the same material can be used as a casting resin or in inks.
Pmma acrylic polymer has a refractive index of 1 49 and a density ranges between 1 17 1 20 g cm 3 which is half less than that of glass.
Many materials have a well characterized refractive index but these indexes depend strongly upon the frequency of light.
Physical properties astm test method units values specific gravity d 792 1 19 optical refractive index d 542 1 49 light transmittance total haze d 1003 92 2 sound transmission e 90 e 413 db 27 water absorption d 570 by wt 0 4 shrinkage d 702.
To make the most effective and efficient use of edge lighted acrylic shapes fabricators must consider the following basic design factors.
This page shows the results of measuring the refractive index with three wavelengths d line c line f line of acrylic resin pmma molded aspheric lens.
Standard refractive index measurements are taken at the yellow doublet sodium d line with a wavelength of 589 nanometers.
Index of refraction values ior for use with 3d modeling rendering and animation applications.
Kpr 300 can also measure resin samples that cannot be processed and be measured.
Transmittance pmma acrylic polymer has a refractive index of 1 49 and hence offers high light transmittance.
Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin film thickness measurement.
For a typical sample of acrylic the refractive index and extinction coefficient at 632 8 nm are 1 48899 and 0.
Many 3d applications these days allow you to input actual ior values in order to achieve a more accurate representation of surfaces during rendering of your 3d models.
Below are files of complete refractive index and extinction coefficients.
Poly methyl methacrylate is produced by free radical polymerization of methyl methacrylate in mass when it is in sheet form or suspension polymerization.
Refractive index database the table below contains links to refractive index data for common materials.
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When refractive index surface reflectance and absorbance of the sheet are known the designer can create displays that appear to be self illuminated.
Over the past few years i have been collecting ior index of refraction values i can find for use in 3d rendering applications.
Pmma grades allow 92 of light to pass through it which is more than glass or other plastics.
There are also weaker dependencies on temperature pressure stress etc as well on precise material compositions presence of dopants etc.
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