eFunda Polymers: Properties of Polyester (thermoplastic) {poly(butylene-terephthalate), Unfilled}
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Polyester (thermoplastic)
 
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State: poly(butylene-terephthalate)
Additives: Unfilled
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   2588  compressive   D638
  1932 - 3002  tensile   D638
Flexural Modulus (MPa)   2277 - 2760   23 ºC   D790
Tensile Strength (MPa)   57 - 60 at break   D638
  57 - 60 at yield   D638
Compressive Strength (MPa)
at yield or break
  59 - 100     D695
Flexural Strength (MPa)
at yield or break
  83 - 115     D790
Elongation at break (%)   50 - 300     D638
Hardness   68 - 78  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  0.4 - 0.5     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   60 - 95     D696
Deflection Temperature (ºC)  116 - 191   0.46 MPa   D648
  50 - 85   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.176 - 0.288     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.3 - 1.38   D792
Water Absorption (% weight increase)  0.4 - 0.5  saturated D570
 0.08 - 0.09  after 24 hrs D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  420 - 550   D149

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)  220 - 267  Tm, crystalline  
Processing Temperature (ºC)  224 - 274  injection molding  
Molding Pressure (MPa)   28 - 69    
Linear Mold Shrinkage (cm/cm)  0.009 - 0.022   D955

Suppliers
Albis Corp. Rosenburg, TX  800-231-5911
Ashley Polymers Brooklyn, NY   
BASF Corp. Mount Olive, NJ  800-BC-RESIN
ComAlloy International Co. Nashville, TN   
Creanova, Inc. Somerset, NJ   
DuPont Co., Polymers Wilmington, DE  800-438-7225
GE Plastics Pittsfield, MA  800-845-0600
M.A. Hanna Engineered Materials Norcross, GA   
RTP Co. Winona, MN  800-433-4787
Ticona Summit, NJ  800-526-4960
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