Editorial Feature

Polyamide 6/12 - Nylon 6/12 - PA 6/12

Developed as a low-moisture absorbing polyamide, polyamide 6/12 (PA 6/12) has a distinct chemical structure that gives it its low-moisture absorbing property. As it has a larger number of carbon atoms separating the amine groups in the polyamide, less moisture can be absorbed by PA 6/12 than a polyamide with less carbon atoms between its amine groups. This makes PA 6/12 less ductile than PA 6 and PA 6/6, as it does not swell due to moisture absorption. This also results in a reduction in the physical properties of PA 6/12 when compared to PA 6 and PA 6/6.

PA 6/12 can be easily modified to improve its physical properties however, and so it can be used in a number of applications that require good physical properties, high heat resistance, chemical and moisture resistance and good dimensional stability.

Polymer Type

Thermoplastic

Advantages

When compared to other polyamides, PA 6/12 has:

  • Lower water absorption (4% at saturation) - than PA 6 and PA 6/6

  • Lower brittle temperature - than PA 6 and PA 6/6

  • Better heat resistance - than PA 6/10

  • Lower mould shrinkage - than PA 6, PA 6/6 or PA 6/10.

Disadvantages

It does have a number of disadvantages compared to other polyamides:

  • Lower heat distortion temperature - than PA 6/6

  • More expensive - than PA 6 or PA 6/6

Typical Properties

Property

Value

Density (g/cm3)

1.06

Surface Hardness

RR105

Tensile Strength (MPa)

51

Flexural Modulus (GPa)

1.4

Notched Izod (kJ/m)

0.04

Linear Expansion  (/°C x 10-5)

9

Elongation at Break (%)

300

Strain at Yield (%)

7

Max. Operating Temp. (°C)

70

Water Absorption (%)

0.25

Oxygen Index (%)

22

Flammability UL94

V2

Volume Resistivity (log ohm.cm)

14

Dielectric Strength (MV/m)

20

Dissipation Factor 1kHz

0.02

Dielectric Constant  1kHz

3.6

HDT @ 0.45 MPa (°C)

160

HDT @ 1.80 MPa (°C)

80

Material. Drying  hrs @ (°C)

2 @ 90

Melting Temp. Range (°C)

230 - 280

Mould Shrinkage (%)

1.1

Mould Temp. Range (°C)

30 -  60

Applications

  • Mechanical parts

  • Zips

  • Filaments

  • Coverings and coatings requiring abrasion resistance

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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