PMP vs. CAB

Both PMP and CAB 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 PMP and the bottom bar is CAB.

Polymethylpentene (PMP)Cellulose Acetate Butyrate (CAB)

Metric UnitsUS Customary Units

Mechanical Properties

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

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

Thermal Properties

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

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

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

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

Electrical Properties

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

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

Otherwise Unclassified Properties

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

Refractive Index		1.5
Refractive Index		1.5

Common Calculations

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

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

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