eFunda Polymers: Properties of Polystyrene and styrene copolymers {styrene / maleic anhydride (SMA) copolymer, impact modified}
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Polystyrene and styrene copolymers		  
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State: styrene / maleic anhydride (SMA) copolymer
Additives: impact modified
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   1863 - 2484  tensile   D638
Flexural Modulus (MPa)   1932 - 3381   23 ºC   D790
Tensile Strength (MPa)   32 - 38 at break   D638
  32 - 45 at yield   D638
Flexural Strength (MPa)
at yield or break		   53 - 90     D790
Elongation at break (%)   10 - 35     D638
Hardness   75 - 109  Rockwell R   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted		   1.3 - 3.2     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   47 - 88     D696
Deflection Temperature (ºC)   93 - 113   1.82 MPa   D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.05 - 1.09   D792
Water Absorption (% weight increase)  0.1 - 0.5  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted		   415 - 480   D149

 Processing Properties Conditions
Type ASTM
Processing Temperature (ºC)  233 - 288  injection molding  
 219 - 274  extrusion  
Molding Pressure (MPa)   83 - 118    
Compression Ratio  2.5 - 2.7    
Linear Mold Shrinkage (cm/cm)  0.004 - 0.006   D955

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Suppliers
Bayer Corp. Pittsburgh, PA  800-662-2927
DSM Engineering Plastic Products, Inc. Reading, PA  800-729-0101
NOVA Chemicals, Ltd. Calgary, Alberta T2P 5C6, Canada   

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