eFunda Polymers: Properties of Polyurethane {thermoplastic, unreinforced, molding}
engineering fundamentals Polymer Material Properties
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Polyurethane
 
List of Suppliers
State: thermoplastic
Additives: unreinforced
Application: molding
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   1311 - 2070  tensile   D638
Flexural Modulus (MPa)   28 - 2139   23 ºC   D790
Tensile Strength (MPa)   31 - 62 at break   D638
  54 - 76 at yield   D638
Flexural Strength (MPa)
at yield or break
  70 - 104     D790
Elongation at break (%)   60 - 550     D638
Hardness   48  Rockwell M   D638
  75  Shore A   D638
  70  Shore D   D638
 100  Rockwell R  lower limit D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  0.8 - 1.0     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   1 - 1     D696
Deflection Temperature (ºC)   46 - 135   0.46 MPa   D648
  70 - 127   1.82 MPa   D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.12 - 1.24   D792
Water Absorption (% weight increase)  0.5 - 0.6  saturated D570
 0.15 - 0.19  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  400   D149

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)   75 - 137  Tm, crystalline  
Processing Temperature (ºC)  188 - 260  injection molding  
 188 - 266  extrusion  
Molding Pressure (MPa)   41 - 103    
Compression Ratio  3    
Linear Mold Shrinkage (cm/cm)  0.004 - 0.01   D955

Suppliers
Bayer Corp. Pittsburgh, PA  800-662-2927
BF Goodrich Co. Twinsburg, OH  800-425-1634
Dow Plastics Midland, MI  800-441-4369
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