Table 3.

Mechanical properties of major ampullate silk fibers

SpeciesSingle fiber diameter (μm)Young's modulus (GPa)Stress at yield (MPa)Strain at yieldExtensibilityUltimate strength (MPa)Toughness (J m−3)
Deinopis spinosa (N=4, n=42)0.50±0.1613.6±0.9273.7±31.50.024±0.0040.22±0.021264±163138±7
Hyptiotes cavatus (N=2, n=13)0.92±0.0110.7±0.5215.5±8.10.022±0.0010.20±0.011837±3164±1
Uloborus diversus (N=6, n=39)0.59±0.067.8±1.6145±330.017±0.0040.22±0.021418±222158±27
  • For this study, s.e.m. was calculated using individual spiders (N) as the sampling unit rather than the total number of fibers tested (n).