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No, it's not epoxy for reinforcing steel. It's "steel reinforced epoxy."

http://www.jbweld.com/products/j-b-weld-twin-tube

How in the world does steel reinforce epoxy?

I can understand how carbon nanotubes dispersed in epoxy can help strength it, quote from paper below:

The mechanical behavior of multiwalled carbon nanotube/epoxy composites was studied in both tension and compression. It was found that the compression modulus is higher than the tensile modulus, indicating that load transfer to the nanotubes in the composite is much higher in compression. In addition, it was found that the Raman peak position, indicating the strain in the carbon bonds under loading, shifts significantly under compression but not in tension. It is proposed that during load transfer to multiwalled nanotubes, only the outer layers are stressed in tension whereas all the layers respond in compression.

But back to steel - as far as I know, steel is a crystalline material and it doesn't possess any property akin to CNTs. Can someone explain how this particular epoxy works?

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  • $\begingroup$ I have no idea why you have problem here - you don't understand what reinforcing means or sth? This link leads to normal glue... $\endgroup$ – Mithoron Jun 21 '15 at 13:09
  • $\begingroup$ The link leads to a product that claims to have steel in it's composition as a structural element. $\endgroup$ – Dissenter Jun 21 '15 at 13:10
  • $\begingroup$ Hmm, it's strange but only in the case of glue. $\endgroup$ – Mithoron Jun 21 '15 at 13:56
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There's no "steel" in that stuff. It is simply filled with inorganic particles, probably (partly?) iron dust. I'm using that stuff too. Quick test with a bar magnet showed the tube with the "steel" component as well as the cured epoxy are indeed slightly ferromagnetic.

Most importantly, i believe, this reduces macroscopic shrinking during curing. Plus the filler particles may impede the propagation of cracks, and reduce the permeability to water, oxygen, etc.

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