CAP vs. PAS

Both CAP and PAS are thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

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

Cellulose Acetate Propionate (CAP)Polyarylsulfone (PAS)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		35 to 50
Elongation at Break, %		40

Flexural Modulus, GPa		1.2 to 1.9
Flexural Modulus, GPa		2.8

Flexural Strength, MPa		29 to 56
Flexural Strength, MPa		110

Tensile Strength: Ultimate (UTS), MPa		28 to 45
Tensile Strength: Ultimate (UTS), MPa		83

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		65 to 80
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		200

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		49

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz		3.6
Dielectric Constant (Relative Permittivity) At 1 MHz		3.5

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

Electrical Resistivity Order of Magnitude, 10^x Ω-m		16
Electrical Resistivity Order of Magnitude, 10^x Ω-m		15

Otherwise Unclassified Properties

Density, g/cm³		1.2
Density, g/cm³		1.4

Water Absorption After 24 Hours, %		1.4 to 1.7
Water Absorption After 24 Hours, %		0.4

Common Calculations

Strength to Weight: Axial, points		6.5 to 10
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		17 to 23
Strength to Weight: Bending, points		31