eFunda Polymers: Properties of Polystyrene and styrene copolymers {styrene / acrylonitrile, copolymer, molding and extrusion}
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Polystyrene and styrene copolymers		  
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State: styrene / acrylonitrile, copolymer
Application: molding and extrusion
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   3657 - 4002  compressive   D638
  3278 - 3864  tensile   D638
Flexural Modulus (MPa)   3450 - 4209   23 ºC   D790
Tensile Strength (MPa)   69 - 83 at break   D638
  69 - 83 at yield   D638
Compressive Strength (MPa)
at yield or break		   97 - 104     D695
Flexural Strength (MPa)
at yield or break		   76 - 132     D790
Elongation at break (%)   2 - 3     D638
Hardness   83 - 75  Rockwell R   D638
  80  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted		   0.2 - 0.3     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   65 - 68     D696
Deflection Temperature (ºC)  105 - 107   0.46 MPa   D648
  95 - 105   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.125     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.06 - 1.08   D792
Water Absorption (% weight increase)  0.5  saturated D570
 0.15 - 0.25  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted		   425   D149

 Processing Properties Conditions
Type ASTM
Melt Flow (gm/10 min)  1.4   D1238
Melting Temperature (ºC)  100 - 200  Tg, amorphous  
Processing Temperature (ºC)  149 - 205  compression molding  
 183 - 288  injection molding  
 183 - 233  extrusion  
Molding Pressure (MPa)   35 - 138    
Compression Ratio  3    
Linear Mold Shrinkage (cm/cm)  0.003 - 0.005   D955

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Suppliers
A. Schulman Akron, OH  800-662-7203
Albis Corp. Rosenburg, TX  800-231-5911
American Polymers, Inc. Worcester, MA   
Bamberger Polymers, Inc. Jericho, NY   
BASF Corp. Mount Olive, NJ  800-BC-RESIN
Bayer Corp. Pittsburgh, PA  800-662-2927
Dow Plastics Midland, MI  800-441-4369
Federal Plastics Corp. Cranford, NJ  800-541-4424
Huntsman Corp. Salt Lake City, UT  800-421-2411
LG Chemical America, Inc. Englewood Cliffs, NJ   
Network Polymers, Inc. Akron, OH  888-437-4674
R.S.G. Polymers Corp. Stony Brook, NY   

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