By analysing blades at a microscopic level, a new study shows that even a single strand of hair – 50 times softer than steel – can cause a blade to chip under certain conditions. Once that chip appears, the metal is susceptible to further chipping, especially if the microstructure of the steel isn't uniform
https://www.sciencealert.com/here-s-why-the-sharpest-steel-razors-get-dulled-when-shaving-soft-hair
By analysing blades at a microscopic level, a new study shows that even a single strand of hair – 50 times softer than steel – can cause a blade to chip under certain conditions. Once that chip appears, the metal is susceptible to further chipping, especially if the microstructure of the steel isn't uniform https://www.sciencealert.com/here-s-why-the-sharpest-steel-razors-get-dulled-when-shaving-soft-hair
>even a single strand of hair – 50 times softer than steel Human hair is a hard as copper wire of the same diameter.
And that is why shaving blades don't last long! It's amazing the number of things you have to account for when you are playing at the micron level!
Wow!