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17
Jun

Polyamide 6 and Polyamide 66 Material Introduction and Comparison

Posted by on in Product Knowledge
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Material Introduction: Polyamide or Nylon is the major engineering and high performance thermaplastic class because of its good balance of properties. Polyamides contain repeating amide linkages i.e. –CO-NH–. It is formed by condensing identical units, copolymers for different units.

Polyamides (or Nylon) are made from polycondensation of diacid with a diamine or by ring-opening polymerization of lactams with 6, 11 or 12 carbon atoms. 

  • The monomers may be aliphatic, semi-aromatic or aromatic (aramids)
  • They may be amorphous, semi-crystalline and of greater or lesser crystallinity

Aromatic polyamides (or Aramids) are obtained from polycondensation of terephthalic acid with diamines. PA 6-3-T is one of the common examples of aromatic polyamide which is an amorphous transparent in nature. The materials can be processed at 280-300°C. Aramids are expensive, have better dimensional stability, flame and heat resistance and higher strength as compared to aliphatic polyamides.

Polyamides exhibit high temperature and electrical resistance. Thanks to their crystalline structure, they also show excellent chemical resistance. They have very good mechanical and barrier properties. In addition, these materials can easily be flame retarded. Polyamides became the first truly synthetic fiber to be commercialized.

Properties Comparison: PA6 Vs PA66


Compare all relevant properties of PA6 and PA66 before selecting the right engineering thermoplastic for a particular application. From physical properties, dimensional stability, electrical performances to fire and thermal properties, find out every possible attribute with its values here.

Property PA6 PA66
Dimensional Stability
Coefficient of Linear Thermal Expansion 5 - 12 x 10-5 /°C 5 - 14 x 10-5 /°C
Shrinkage 0.5 - 1.5 % 0.7 - 3 %
Water Absorption 24 hours 1.6 - 1.9 % 1 - 3 %
Electrical Properties
Arc Resistance 118 - 125 sec 130 - 140 sec
Dielectric Constant 4 - 5 4 - 5
Dielectric Strength 10 - 20 kV/mm 20 - 30 kV/mm
Dissipation Factor 100 - 600 x 10-4 100 - 400 x 10-4
Volume Resistivity 14 x 1015 Ohm.cm 14 x 1015 Ohm.cm
Fire Performances
Fire Resistance (LOI) 23 - 26 % 21 - 27  %
Flammability UL94 HB HB
Mechanical Properties
Elongation at Break 200 - 300 % 150 - 300 %
Elongation at Yield 3.4 - 140 % 3.4 - 30 %
Flexibility (Flexural Modulus) 0.8 - 2 GPa 0.8 - 3 GPa
Hardness Rockwell M 30 - 80  30 - 80 
Hardness Shore D 80 - 95  80 - 95 
Stiffness (Flexural Modulus) 0.8 - 2 GPa 0.8 - 3 GPa
Strength at Break (Tensile) 50 - 95 MPa 50 - 95 MPa
Strength at Yield (Tensile) 50 - 90 MPa 45 - 85 MPa
Toughness (Notched Izod Impact at  Room Temperature) 50 - 160 J/m 50 - 1150 J/m
Toughness at Low Temperature  (Notched Izod Impact at Low  Temperature) 16 - 210 J/m 27 - 35 J/m
Young Modulus 0.8 - 2GPa 1 - 3.5 GPa
Optical Properties
Gloss 130 - 145 % 65 - 150 %
Physical Properties
Density 1.12 - 1.14 g/cm3 1.13 - 1.15 g/cm3
Glass Transition Temperature 60 °C 55 - 58 °C
Radiation Resistance
Gamma Radiation Resistance Fair Fair
UV Light Resistance Fair Poor
Service Temperature
HDT @0.46 Mpa (67 psi) 150 - 190 °C 180 - 240 °C
HDT @1.8 Mpa (264 psi) 60 - 80 °C 65 - 105 °C
Max Continuous Service Temperature 80-120 °C 80 - 140 °C
Min Continuous Service Temperature -40 to -20 °C -80 to -65 °C
Others
Sterilization Resistance (Repeated) Poor Poor
Thermal Insulation (Thermal  Conductivity) 0.24 W/m.K 0.25 W/m.K
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