ACRYLIC (PMMA: POLYMETHYL-METHACRYLATE)

ACRYLIC (PMMA: POLYMETHYL-METHACRYLATE)

Material Information

Acrylics are thermoplastics that are produced by the polymerization of acrylic esters. Acrylics are easily sawed, drilled, milled, engraved, and finished. They can be readily bent or thermoformed at low temperature. They offer high light transmittance and most acrylics have been UV stabilized for good weatherability. This makes them the best choice for light-transmitting applications. Acrylics offer a high strength to weight ratio, have a higher coefficient of thermal expansion than metals, have low electrical conductivity, and also have good arc resistance. Although acrylics are unaffected by moisture such as aqueous lab chemicals, detergents, cleaners, dilute inorganic acids, alkalis, and aliphatic hydrocarbons, they are not recommended for use with chlorinated or aromatic hydrocarbons, esters, or ketones. Acrylics are available most commonly in a clear color but can be found in a wide variety of colors. It is available in cast, continuous cast, and extruded grades in the form of sheet, rod, and tube. Sheet comes with masking on both sides.

Application

  • Signs
  • Point of purchase displays
  • Models
  • Lenses
  • Electrical parts
  • Glazing
  • Furniture
  • Windows and skylights
  • Aircraft windows

Properties

  • High optical clarity
  • High tensile strength
  • High resistance to heat distortion
  • Outstanding weatherability
  • Good electrical properties

Physical

Astm Test Method

Acrylic

Density (lb/in^3) D792 0.043
Specific Gravity D792 1.18
Water Absorption @ 24 hours (%) D570 0.03

Mechanical

Tensile Strength (PSI) D638 8,000 – 11,000
Tensile Modulus (PSI) D638 350,000 – 500,000
Tensile Elongation at Break (%) D638 2
Flexural Strength (PSI) D790 12000 – 17000
Flexural Modulus (PSI) D790 350,000 – 500,000
Compressive Strength (PSI) D695 11,000 – 19,000
Compressive Modulus (PSI) D695 -
Izod Impact (Notched), ft-lb/in D256 0.3
Rockwell Hardness D785 M80 – M100

Thermal

Coefficient of Thermal Expansion,
10^-5/°F
D696 5 to 9
Heat Deflection Temperature 264 psi, ºF D648 150 – 210
Melting Point, °F D3418 265 – 285
Continous Service Temp (Operating), °F - 150 – 200
Thermal Conductivity, BTU-in/hr-ft² °F F433 3.9
Flammability Rating UL94 -

Electrical

Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 400
Volume Resistivity (ohm/square) D257 -
Dielectric Constant at 60hz D150 4
Dissipation Factor at 60Hz D150 0.0

Optical

Light Transmission, Minimum (%)  - 92
Refractive Index  - 1.48 – 1.50

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. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.