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 GENERAL DESCRIPTION
Acrylics (Polymethyl-Methacrylate or PMMA) is an amorphous thermoplastic which is optically transparent, unaffected by moisture, and offers a high strength-to-weight ratio. Common trade names of acrylic include Plexiglas®, Lucite®, and Acrylite®.
GENERAL PROPERTIES
Acrylics offer high light transmittance with a Refractive Index of 1.49 and can be easily heat-formed without loss of optical clarity. Prolonged exposure to moisture, or even total immersion in water, does not significantly effect the mechanical or optical properties of acrylic. Most commercial acrylics have been UV stabilized for good weatherability and resistance prolonged sunlight exposure.
Acrylics are unaffected by aqueous solutions of most laboratory chemicals, by detergents, cleaners, dilute inorganic acids, alkalis, and aliphatic hydrocarbons -- however, acrylics are NOT recommended for use with chlorinated or aromatic hydrocarbons, esters, or ketones. |
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| TYPICAL PROPERTIES OF ACRYLIC PMMA |
| PHYSICAL |
| ASTM or UL test |
Property |
Acrylic |
| D792 |
Density (lb/in3)
(g/cm3) |
0.0433
1.183 |
| D570 |
Water Absorption, 24 hrs (%) |
0.3 |
| MECHANICAL |
| D638 |
Tensile Strength (psi) |
8,000-11,000 |
| D638 |
Tensile Modulus (psi) |
350,000-500,000 |
| D638 |
Tensile Elongation at Break (%) |
2 |
| D790 |
Flexural Strength (psi) |
12,000-17,000 |
| D790 |
Flexural Modulus (psi) |
350,000-500,000 |
| D695 |
Compressive Strength (psi) |
11,000-19,000 |
| D695 |
Compressive Modulus (psi) |
- |
| D785 |
Hardness, Rockwell |
M80-M100 |
| D256 |
IZOD Notched Impact (ft-lb/in) |
0.3 |
| THERMAL |
| D696 |
Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F) |
5-9 |
| D648 |
Heat Deflection Temp (°F/°C) at 264 psi |
150-210/65-100 |
| D3418 |
Melting Temp (°F/°C) |
-/- |
| - |
Max Operating Temp (°F/°C) |
150-200/65-93 |
| C177 |
Thermal Conductivity
(BTU-in/ft2-hr-°F)
(x 10-4 cal/cm-sec-°C) |
3.93
1.23 |
| UL94 |
Flammability Rating |
- |
| ELECTRICAL |
| D149 |
Dielectric Strength (V/mil) short time, 1/8” thick |
400 |
| D150 |
Dielectric Constant at 60 Hz |
4.0 |
| D150 |
Dissipation Factor at 60 Hz |
0.05 |
| OPTICAL |
| - |
Light Transmission, minimum (%) |
92 |
| - |
Refractive Index |
1.48-1.50 |
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Note: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control.
All values a 73°F (23°C) unless otherwise noted.
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