Comparison
HIPS Injection Molding vs PA66
A side-by-side comparison of High Impact Polystyrene for Injection Molding and Polyamide 6,6 (Nylon).
Physical
Density
1.04-1.06 g/cm³
1.14 g/cm³
Water Absorption (24h)
0.05-0.2 %
1.2 %
Transparency
Opaque
Opaque
Shrinkage
0.4-0.8 %
1.5 – 2.0 %
Mechanical
Young's Modulus
1.5-2.5 GPa
3.0 GPa (dry)
Tensile Strength
20-30 MPa
80 MPa
Elongation at Break
5-20 %
60 %
Impact Strength (Izod)
50-150 J/m
50 J/m
Flexural Strength
—
110 MPa
Thermal
Glass Transition Temperature
90-100 °C
70 °C
Melting Point
N/A (amorphous)
255 – 265 °C
Continuous Service Temperature
60-70 °C
100 – 120 °C
Heat Deflection Temperature
70-80 °C
75 °C (unfilled)
Electrical
Dielectric Constant
2.5-2.7
4.0
Volume Resistivity
>10¹⁵ Ω⋅cm
10¹² Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Poor
Bases
Good resistance
Good
Solvents
Attacked by aromatic hydrocarbons, ketones, and esters
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils & Fuels
—
Excellent
Sustainability
Recyclability
Recyclable
Recyclable
Recycling Code
6 (PS)
7
Carbon Footprint
Moderate
~7.4 kg CO₂e / kg
Bio-based Content
—
0 – 100 % (bio grades)