PAS vs. Thermoset PI

PAS belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 15 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is PAS and the bottom bar is thermoset PI.

Polyarylsulfone (PAS)Thermoset Polyimide (PI)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		40
Elongation at Break, %		2.0 to 5.9

Flexural Modulus, GPa		2.8
Flexural Modulus, GPa		3.1 to 4.8

Flexural Strength, MPa		110
Flexural Strength, MPa		60 to 100

Impact Strength: Notched Izod, J/m		85
Impact Strength: Notched Izod, J/m		21 to 43

Tensile Strength: Ultimate (UTS), MPa		83
Tensile Strength: Ultimate (UTS), MPa		37 to 81

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		200
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		370

Thermal Expansion, µm/m-K		49
Thermal Expansion, µm/m-K		38 to 54

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz		3.5
Dielectric Constant (Relative Permittivity) At 1 MHz		3.1

Dielectric Strength (Breakdown Potential), kV/mm		15
Dielectric Strength (Breakdown Potential), kV/mm		20

Electrical Resistivity Order of Magnitude, 10^x Ω-m		15
Electrical Resistivity Order of Magnitude, 10^x Ω-m		15

Otherwise Unclassified Properties

Density, g/cm³		1.4
Density, g/cm³		1.4 to 1.6

Limiting Oxygen Index (LOI), %		33
Limiting Oxygen Index (LOI), %		40

Water Absorption After 24 Hours, %		0.4
Water Absorption After 24 Hours, %		0.14 to 0.24

Common Calculations

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		6.5 to 16

Strength to Weight: Bending, points		31
Strength to Weight: Bending, points		16 to 30