In the YouTube video Ductility Test, I saw a black substance undergo a ductility test. It appeared to be as ductile as silly putty although silly putty is just a very viscous liquid. It seems that it can keep being pulled thinner and thinner. I couldn't find the name of the substance in the video. I just want to know the name of that substance. Once I learn the name of that substance, I can ask another question about the properties of that substance.

I'll ask whether it's a solid unlike silly putty. I know it started off as a liquid but I'll ask whether it got turned into a solid or just a very viscous liquid. I'll ask "If it's a solid, what is its yield strength?" If it has a higher yield strength than the typical chromium steel, it could be very revolutionary because it cannot sustain crack propagation and therefore cannot be weakened much by the presence of a crack.

  • $\begingroup$ I suggest including the youtube link in body of the questions. $\endgroup$ Feb 29, 2020 at 19:06
  • $\begingroup$ It is Asphalt (bitumen) tested per ASTM D 113. $\endgroup$
    – hazzey
    Feb 29, 2020 at 20:06
  • $\begingroup$ And the final frame of the test identifies it as bitumen. $\endgroup$
    – Phil Sweet
    Mar 2, 2020 at 4:06

1 Answer 1


If you compare your video with https://www.youtube.com/watch?v=TE8zYxUJHt0 which uses a very similar test procedure, the material is probably the same: bitumen.


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