Kraig Biocraft Laboratories Inc (KBLB)

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The as-spun NT2RepCT fibers had a qualitatively similar stress:strain behavior to native spider silk in that they displayed an initial elastic phase up until a yielding point, after which plastic deformation occurred. The mechanical characteristics of the fibers were highly reproducible, although the toughness and ultimate tensile strength were lower than in native silk (Supplementary Fig. 7; Supplementary Table 2). One possible way to increase the toughness could be to spin NT2RepCT fibers with diameters closer to that of native dragline silk, as this apparently has an impact on the mechanical properties of silk fibers. The toughness of NT2RepCT fibers (45 MJ/m3) is, to the best of our knowledge, by far the highest hitherto reported for as-spun fibers.