RTPU vs. CA

Both RTPU and CA are thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is RTPU and the bottom bar is CA.

Rigid Thermoplastic Polyurethane (RTPU, PUR-RT)Cellulose Acetate (CA)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		5.0
Elongation at Break, %		25 to 30

Tensile Strength: Ultimate (UTS), MPa		75
Tensile Strength: Ultimate (UTS), MPa		30 to 37

Thermal Properties

Maximum Temperature: Autoignition, °C		270
Maximum Temperature: Autoignition, °C		400

Maximum Temperature: Decomposition, °C		320
Maximum Temperature: Decomposition, °C		250

Specific Heat Capacity, J/kg-K		1760
Specific Heat Capacity, J/kg-K		1500

Thermal Conductivity, W/m-K		0.6
Thermal Conductivity, W/m-K		0.25

Thermal Expansion, µm/m-K		100
Thermal Expansion, µm/m-K		14

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		24
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		1.1
Density, g/cm³		1.3

Common Calculations

Strength to Weight: Axial, points		20
Strength to Weight: Axial, points		6.4 to 7.9

Strength to Weight: Bending, points		38
Strength to Weight: Bending, points		17 to 19

Thermal Diffusivity, mm²/s		0.32
Thermal Diffusivity, mm²/s		0.13