eFunda Polymers: Properties of Polyester (thermoplastic) {poly(butylene-terephthalate), impact modified}
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Polyester (thermoplastic)		  
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State: poly(butylene-terephthalate)
Additives: impact modified
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   1905  tensile   D638
Tensile Strength (MPa)   46 at yield   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted		   1.7     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)  135     D696
Deflection Temperature (ºC)  120   0.46 MPa   D648
  50   1.82 MPa   D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.2   D792
Water Absorption (% weight increase)  0.3  saturated D570

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)  225  Tm, crystalline  
Processing Temperature (ºC)  250 - 275  injection molding  
Linear Mold Shrinkage (cm/cm)  0.02   D955

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Suppliers
Ashley Polymers Brooklyn, NY   
BASF Corp. Mount Olive, NJ  800-BC-RESIN
M.A. Hanna Engineered Materials Norcross, GA   

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