![]() When the fluid behaves as such it is READY!!!, Mix it up with some acetone to just dilute it enough it no longer shear thickens, then paint it on to the kevlar. If allowed to rest the fluid will return to a flowing state.Įxample pictures show how jagged it looks when being ripped out of the container, and a few seconds later how it looks when it has relaxed. Slowly add PEG 200 to the reptical until you get a liquid that is impossible to stir and sticks to the utensil when it is pulled rapidly out of the container. Get a strong container and add some oven dried reptical ultra fine precipitated calcium carbonate. Once strong shear forces are removed the fluid returns to a fluid state. ![]() Then mix up your STF(shear thickening fluid) this fluid will remain flexible while imbedded in the kevlar allowing easy movement yet when it is strongly impacted by a bullet or a stabbing utensil the calcium carbonate will lock together around the poly ethylene glycol molecules and resist deformation. ![]() You will need 10 layers of kevlar to make an effective level 3a vest. ![]() Then dry your kevlar in 250 degree F oven for 2-3 hours this removes water from in between each individual aramid strand increasing the vanderwall interactions and making a stronger fiber. I developed a new shear thickening fluid accidentally!Ĭut kevlar fabric to the same size for whatever size panel you want to make. ![]()
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