Comparison
Cellulose Acetate Film Grade K vs PEEK
A side-by-side comparison of Cellulose Acetate, Film Grade K and Polyether Ether Ketone.
Physical
Density
1.30 g/cm³
1.32 g/cm³
Water Absorption (24h)
2.0 %
0.15 %
Transparency
Excellent
Opaque (amber)
Shrinkage
1.0 - 2.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
2.5 GPa
3.6 GPa
Tensile Strength
40 MPa
100 MPa
Elongation at Break
15.0 %
50 %
Impact Strength (Izod)
0.5 J/cm
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
100-120 °C
143 °C
Melting Point
None (degrades)
343 °C
Continuous Service Temperature
60 °C
260 °C
Heat Deflection Temperature
60 °C
160 °C
Electrical
Dielectric Constant
3.5
3.2
Volume Resistivity
10¹⁰ Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
15 kV/mm
—
Chemical resistance
Acids
Poor resistance
Excellent
Bases
Poor resistance
Excellent
Solvents
Soluble in esters, ketones, and chlorinated hydrocarbons
Excellent
UV Resistance
Moderate
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Biodegradable (compost, requires specific conditions)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg