eFunda Polymers: Properties of Acrylic {poly(methylmethacrylate), PMMA, molding and extrusion compounds}
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Acrylic		  
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State: poly(methylmethacrylate), PMMA
Application: molding and extrusion compounds
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   2553 - 3174  compressive   D638
  2243 - 3243  tensile   D638
Flexural Modulus (MPa)   2243 - 3174   23 ºC   D790
Tensile Strength (MPa)   49 - 73 at break   D638
  54 - 74 at yield   D638
Compressive Strength (MPa)
at yield or break		   73 - 125     D695
Flexural Strength (MPa)
at yield or break		   73 - 132     D790
Elongation at break (%)   2 - 6     D638
Hardness   68 - 105  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted		   0.1 - 0.2     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   50 - 90     D696
Deflection Temperature (ºC)   74 - 108   0.46 MPa   D648
  69 - 100   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.167 - 0.251     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.17 - 1.2   D792
Water Absorption (% weight increase)  0.1 - 0.4  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted		   400 - 500   D149

 Processing Properties Conditions
Type ASTM
Melt Flow (gm/10 min)  1.4 - 27   D1238
Melting Temperature (ºC)   85 - 105  Tg, amorphous  
Processing Temperature (ºC)  163 - 260  injection molding  
 183 - 260  extrusion  
 149 - 219  compression molding  
Molding Pressure (MPa)   35 - 138    
Compression Ratio  1.6 - 3    
Linear Mold Shrinkage (cm/cm)  0.001 - 0.004  flow direction D955
Linear Mold Shrinkage (cm/cm)  0.002 - 0.008  transverse dir. D955

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Suppliers
American Polymers, Inc. Worcester, MA   
AtoHaas Americas, Inc. Philadelphia, PA   
Continental Acrylics, Inc. Compton, CA  800-562-8883
Cyro Industries Rockaway, NJ  800-631-5384
DuPont Co., Polymers Wilmington, DE  800-438-7225
ICI Acrylics, Inc. Cordova, TN  800-325-9577
LG Chemical America, Inc. Englewood Cliffs, NJ   
Network Polymers, Inc. Akron, OH  888-437-4674
Plaskolite, Inc. Columbus, OH  800-848-9124
RTP Co. Winona, MN  800-433-4787

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