Comparison
PLA Silk Filament vs PETG
A side-by-side comparison of Polylactic Acid Silk Filament and Polyethylene Terephthalate Glycol.
Physical
Density
1.24 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.5-1.0 %
0.13 %
Transparency
Opaque (with high sheen)
Transparent
Shrinkage
Low (0.2-0.5%)
0.2 – 0.5 %
Mechanical
Young's Modulus
2.8-3.3 GPa
2.1 GPa
Tensile Strength
48-58 MPa
50 MPa
Elongation at Break
3-4 %
120 %
Impact Strength (Izod)
2-3 kJ/m²
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
58-63 °C
80 °C
Melting Point
150-168 °C
—
Continuous Service Temperature
38-48 °C
65 °C
Heat Deflection Temperature
48-53 °C @ 0.45 MPa
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.0-3.4
3.3
Volume Resistivity
10¹²-10¹³ Ω·cm
10¹⁴ Ω·cm
Dielectric Strength
14-19 MV/m
—
Chemical resistance
Acids
Resistant to weak acids
Good
Bases
Attacked by strong bases
Fair
Solvents
Attacked by esters, ketones, and chlorinated hydrocarbons
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Mechanically Recyclable (limited
Recyclable
Recycling Code
7 (Other)
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %