CAB vs. PMP

Both CAB and PMP are thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

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

Cellulose Acetate Butyrate (CAB)Polymethylpentene (PMP)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		50 to 55
Elongation at Break, %		30

Tensile Strength: Ultimate (UTS), MPa		20 to 50
Tensile Strength: Ultimate (UTS), MPa		24

Thermal Properties

Glass Transition Temperature, °C		140
Glass Transition Temperature, °C		30

Specific Heat Capacity, J/kg-K		1460
Specific Heat Capacity, J/kg-K		1750

Thermal Conductivity, W/m-K		0.25
Thermal Conductivity, W/m-K		0.17

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		120

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		15
Dielectric Strength (Breakdown Potential), kV/mm		28

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

Otherwise Unclassified Properties

Density, g/cm³		1.2
Density, g/cm³		0.83

Refractive Index		1.5
Refractive Index		1.5

Common Calculations

Strength to Weight: Axial, points		4.8 to 12
Strength to Weight: Axial, points		8.0

Strength to Weight: Bending, points		14 to 25
Strength to Weight: Bending, points		22

Thermal Diffusivity, mm²/s		0.14 to 0.15
Thermal Diffusivity, mm²/s		0.12