CAB vs. PEEK

Both CAB and PEEK are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (20, in this case) are not shown.

For each property being compared, the top bar is CAB and the bottom bar is PEEK.

Cellulose Acetate Butyrate (CAB)Polyetheretherketone (PEEK)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		50 to 55
Elongation at Break, %		1.6 to 43

Flexural Modulus, GPa		0.8 to 1.7
Flexural Modulus, GPa		3.8 to 19

Flexural Strength, MPa		21 to 57
Flexural Strength, MPa		150 to 330

Tensile Strength: Ultimate (UTS), MPa		20 to 50
Tensile Strength: Ultimate (UTS), MPa		97 to 200

Thermal Properties

Glass Transition Temperature, °C		140
Glass Transition Temperature, °C		240

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		53 to 82
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		160 to 300

Specific Heat Capacity, J/kg-K		1460
Specific Heat Capacity, J/kg-K		1390 to 1700

Thermal Conductivity, W/m-K		0.25
Thermal Conductivity, W/m-K		0.25 to 0.93

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		15 to 52

Electrical Properties

Electrical Resistivity Order of Magnitude, 10^x Ω-m		16
Electrical Resistivity Order of Magnitude, 10^x Ω-m		3.0 to 14

Otherwise Unclassified Properties

Density, g/cm³		1.2
Density, g/cm³		1.3 to 1.5

Limiting Oxygen Index (LOI), %		18
Limiting Oxygen Index (LOI), %		38

Water Absorption After 24 Hours, %		1.2 to 1.6
Water Absorption After 24 Hours, %		0.060 to 0.3

Common Calculations

Strength to Weight: Axial, points		4.8 to 12
Strength to Weight: Axial, points		20 to 41

Strength to Weight: Bending, points		14 to 25
Strength to Weight: Bending, points		36 to 55

Thermal Diffusivity, mm²/s		0.14 to 0.15
Thermal Diffusivity, mm²/s		0.1 to 0.51