PMP vs. CA

Both PMP and CA are thermoplastics. There are 13 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 PMP and the bottom bar is CA.

Polymethylpentene (PMP)Cellulose Acetate (CA)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		30
Elongation at Break, %		25 to 30

Tensile Strength: Ultimate (UTS), MPa		24
Tensile Strength: Ultimate (UTS), MPa		30 to 37

Thermal Properties

Glass Transition Temperature, °C		30
Glass Transition Temperature, °C		230

Specific Heat Capacity, J/kg-K		1750
Specific Heat Capacity, J/kg-K		1500

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		1.3

Refractive Index		1.5
Refractive Index		1.5

Common Calculations

Strength to Weight: Axial, points		8.0
Strength to Weight: Axial, points		6.4 to 7.9

Strength to Weight: Bending, points		22
Strength to Weight: Bending, points		17 to 19

Thermal Diffusivity, mm²/s		0.12
Thermal Diffusivity, mm²/s		0.13