eFunda Polymers: Properties of Polyester (thermoset) {glass fiber reinforced, SMC}
engineering fundamentals Polymer Material Properties
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Polyester (thermoset)
 
List of Suppliers
Additives: glass fiber reinforced
Application: SMC
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   9660 - 17250  tensile   D638
Flexural Modulus (MPa)   6900 - 15180   23 ºC   D790
Tensile Strength (MPa)   48 - 173 at break   D638
Compressive Strength (MPa)
at yield or break
 104 - 207     D695
Flexural Strength (MPa)
at yield or break
  69 - 248     D790
Elongation at break (%)   3     D638
Hardness   50 - 70  Barcol   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  3.7 - 11.7     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   14 - 20     D696
Deflection Temperature (ºC)  191 - 260   1.82 MPa   D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.65 - 2.6   D792
Water Absorption (% weight increase)  0.1 - 0.25  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  380 - 500   D149

 Processing Properties Conditions
Type ASTM
Processing Temperature (ºC)  132 - 193  compression molding  
 138 - 154  transfer molding  
 138 - 154  injection molding  
Molding Pressure (MPa)   2 - 14    
Compression Ratio  1    
Linear Mold Shrinkage (cm/cm)  5 - 0.004   D955

Suppliers
Budd Co. Troy, MI   
Haysite Reinforced Plastics Erie, PA   
Interplastic Corp. St Paul, MN  800-736-5497
Jet Moulding Compounds, Ltd. Ajax, Ontario, Canada L1S 1R8   
Plastics Mfg. Co. Dallas, TX   
Polyply Composites, Inc. Grand Haven, MI   
Premix, Inc. North Kingsville, OH   
Rostone Lafayette, IN   
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