Non-Newtonian Fluids vs. Bullet (Silly Putty!)

Non-Newtonian fluids are amazing. Most of us have played with them at some point, but few have actually experimented with it. Currently, non-Newtonian fluids are a major research vein for body armor in how they can be flexible until a large force impacts the material, at which point its properties would cause it to solidify and (in theory) stop a bullet.

Does the theory hold water? Yes, it does, but Silly Putty itself is not the answer as Taufledermaus kindly shows. 


Nathan S.

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

Nathan can be reached at

The above post is my opinion and does not reflect the views of any company or organization.


  • USMC03Vet

    In order to hit the sounding smart level you have to use Non-Newtonian 3 times within 2 sentences. Sorry, Bro.

    • MrDakka

      Should’ve used shear thickening fluid.

  • JumpIf NotZero

    Kindly please stop being redneck-by-association.

  • Major Tom

    How about wrapping up cornflour around a steel or aluminum plate? Like the kind of plate you’d use for shed siding.

  • Mystick

    It didn’t work because there was no newsprint on the silly-putty.