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Here are ultimate tensile strengths for 3 types of silk from three different species of silk worm:
Atlas: 29,000 psi [200 MPa]
Mori: 94,000 psi [650 MPa]
Trifasciata: 87,000 [600 MPa]
I found these values in this paper:
Fractographic analysis of silkworm and spider silk
P. Poza *, J. Perez-Rigueiro, M. Elices, J. LLorca
Departamento de Ciencia de Materiales, Universidad Politecnica de Madrid, E.T.S. de Ingenieros de Caminos, 28040 Madrid, Spain
I also found tensile data for some spider silk. This paper studied their best estimate of the species of spider that would give the highest tensile values: C. Darwini from Madagascar
C. Darwini: 268,000 psi [1850 MPa]
I found these values and a discussion in:
Bioprospecting Finds the Toughest Biological Material: Extraordinary Silk from a Giant Riverine Orb Spider
Published: September 16, 2010
Citation: Agnarsson I, Kuntner M, Blackledge TA (2010) Bioprospecting Finds the Toughest Biological Material: Extraordinary Silk from a Giant Riverine Orb Spider. PLoS ONE 5(9): e11234. doi:10.1371/journal.pone.0011234
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