Comparison
Gas Impermeable Isobutylene Isoprene Rubber vs PLA
A side-by-side comparison of Isobutylene Isoprene Rubber (Butyl Rubber) and Polylactic Acid.
Physical
Density
0.92 - 0.94 g/cm³
1.24 g/cm³
Water Absorption (24h)
0.1 %
0.5 %
Transparency
Opaque
Semi-transparent
Shrinkage
2.0 - 3.0 %
0.3 – 0.5 %
Mechanical
Young's Modulus
0.01 - 0.05 GPa
3.5 GPa
Tensile Strength
5 - 20 MPa
50 – 65 MPa
Elongation at Break
300 - 700 %
6 %
Impact Strength (Izod)
N/A
16 J/m
Flexural Strength
—
80 MPa
Thermal
Glass Transition Temperature
-60 to -70 °C
60 °C
Melting Point
N/A
150 – 160 °C
Continuous Service Temperature
-50 to 120 °C
45 °C
Heat Deflection Temperature
N/A
55 °C
Electrical
Dielectric Constant
2.5 - 3.0
3.0
Volume Resistivity
10^13 - 10^14 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
20 - 30 kV/mm
—
Chemical resistance
Acids
Good
Fair
Bases
Good
Poor
Solvents
Good resistance to polar solvents, water, steam; Poor resistance to hydrocarbons
—
UV Resistance
Excellent
Poor
Alcohols
—
Fair
Hydrolysis
—
Poor
Sustainability
Recyclability
Limited
Industrially compostable
Recycling Code
N/A
7
Carbon Footprint
Moderate
~1.6 kg CO₂e / kg
Bio-based Content
—
100 %