jzmtl,
All of our sheaths that are GFN (Glass filled Nylon) have had the glass content lowered. (Not complertely eliminated) If we totally pull the glass from the mixture, the nylon would not have the strength and rigidity that we believe is necessary for the sheath to
protect the user from the sharpened edge (The primary reason for a sheath) Nylon without glass: think Nylon stockings and toothbrush handles; not very reassuring. Interestingly, we lowered the glass content because the sheaths were too stiff and made insertion and removal of the blade very difficult, not the dulling issue. We started last year sometime. It was a running change so there will be both in the stream for a while. How do you tell high from low glass? Hit the sheath on a hard surface; if there is a "clacking" sound it is high glass; a dull "thunk" means low glass. We are working with our contractor to redesign the sheaths so if the blade edge is dragged into the sheath, it will not be dulled. Until such time, ingress and egress of the blade should be straight and not angled. Not a hard thing to do....or an aftermarket sheath.
Hope this helps.
Best Regards,
Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives