eFunda Polymers: Properties of Polyester (thermoset) {glass fiber reinforced, woven cloth}
engineering fundamentals Polymer Material Properties
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Polyester (thermoset)
 
List of Suppliers
Additives: glass fiber reinforced, woven cloth
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)  10350 - 31050  tensile   D638
Flexural Modulus (MPa)   6900 - 20700   23 ºC   D790
  4554   93 ºC   D790
  2967  121 ºC   D790
  1863  149 ºC   D790
Tensile Strength (MPa)  207 - 345 at break   D638
Compressive Strength (MPa)
at yield or break
 173 - 345     D695
Flexural Strength (MPa)
at yield or break
 276 - 552     D790
Elongation at break (%)   1 - 2     D638
Hardness   60 - 80  Barcol   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  2.7 - 15.9     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   15 - 30     D696
Deflection Temperature (ºC)  204   1.82 MPa  lower limit D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.5 - 2.1   D792
Water Absorption (% weight increase)  0.05 - 0.5  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  350 - 500   D149

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)  thermoset  Tm, crystalline  
Molding Pressure (MPa)   2    
Linear Mold Shrinkage (cm/cm)  2 - 0.002   D955

Suppliers
Glastic Corp. Cleveland, OH   
Haysite Reinforced Plastics Erie, PA   
Jet Moulding Compounds, Ltd. Ajax, Ontario, Canada L1S 1R8   
Premix, Inc. North Kingsville, OH   
Reichhold Research Triangle Park, NC  800-431-1920
Rostone Lafayette, IN   
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