eFunda Polymers: Properties of Polyetherimide {30% carbon fiber, EMI shielding (conductive)}
engineering fundamentals Polymer Material Properties
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Polyetherimide
 
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Additives: 30% carbon fiber
Application: EMI shielding (conductive)
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)  17940 - 22770  tensile   D638
Flexural Modulus (MPa)  17250 - 17940   23 ºC   D790
Tensile Strength (MPa)  200 - 235 at break   D638
Compressive Strength (MPa)
at yield or break
 221     D695
Flexural Strength (MPa)
at yield or break
 255 - 311     D790
Elongation at break (%)   1 - 3     D638
Hardness  127  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  0.6 - 0.8     D256A

 Thermal Properties Conditions
Pressure State ASTM
Deflection Temperature (ºC)  210 - 218   0.46 MPa   D648
 207 - 216   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.736     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.39 - 1.42   D792
Water Absorption (% weight increase)  0.18 - 0.2  after 24 hrs D570

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)  215  Tg, amorphous  
Processing Temperature (ºC)  316 - 416  injection molding  
Molding Pressure (MPa)   69 - 207    
Compression Ratio  1.5 - 3    
Linear Mold Shrinkage (cm/cm)  5 - 0.002   D955

Suppliers
ComAlloy International Co. Nashville, TN   
DSM Engineering Plastic Products, Inc. Reading, PA  800-729-0101
Ferro Corp. Cleveland, OH   
LNP Engineering Plastics, Inc. Exton, PA  800-854-8774
RTP Co. Winona, MN  800-433-4787
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