Comparison
Casein Bioplastic vs PEEK
A side-by-side comparison of Casein, Bioplastic Grade U and Polyether Ether Ketone.
Physical
Density
1.30-1.40 g/cm³
1.32 g/cm³
Water Absorption (24h)
3.0-6.0 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
2.0 - 4.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
2.0-3.0 GPa
3.6 GPa
Tensile Strength
25-40 MPa
100 MPa
Elongation at Break
3.0 %
50 %
Impact Strength (Izod)
0.1 J/cm
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
70-90 °C
143 °C
Melting Point
None (degrades)
343 °C
Continuous Service Temperature
50 °C
260 °C
Heat Deflection Temperature
45 °C
160 °C
Electrical
Dielectric Constant
5.5
3.2
Volume Resistivity
10⁸ Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
10 kV/mm
—
Chemical resistance
Acids
Sensitive
Excellent
Bases
Sensitive
Excellent
Solvents
Insoluble in water, but sensitive to moisture; soluble in alkaline solutions
Excellent
UV Resistance
Poor
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Biodegradable (compost)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Low (utilizes dairy byproduct)
~30 kg CO₂e / kg