- grinding wheel.jpg (72.33 KiB) Viewed 724 times
I imagine that whatever they use as bonders/binders can technically degrade over time, but I've used wheels that were easily 10-20 years old and never had an issue, and have never heard of anyone else having an issue. For 6-8" wheels I would have no worries. If using much larger wheels and at high speeds, then maybe worry about a bit if the wheel is more than a decade old 
kiwi2wheels
- kiwi2wheels
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Joined:Sun Feb 17, 2013 10:27 am
Add to the list of things one would never have thought about.............. 
From pg 23 ;
https://multimedia.3m.com/mws/media/131 ... on-pdf.pdf
" Vitrified bonded grinding wheels can be stored indefinitely.
Synthetic resin bonded grinding wheels should not be stored for more than 3 years because otherwise the strength of the wheel could drop due to embrittlement."
And another opinion.
https://www.nortonabrasives.com/en-us/r ... ing-wheels
Definitely data that needs to be hidden from the " 'elf an' safety " nazis, that is if you're unlucky enough to be somewhere that's infested with them !
From pg 23 ;
https://multimedia.3m.com/mws/media/131 ... on-pdf.pdf
" Vitrified bonded grinding wheels can be stored indefinitely.
Synthetic resin bonded grinding wheels should not be stored for more than 3 years because otherwise the strength of the wheel could drop due to embrittlement."
And another opinion.
https://www.nortonabrasives.com/en-us/r ... ing-wheels
Definitely data that needs to be hidden from the " 'elf an' safety " nazis, that is if you're unlucky enough to be somewhere that's infested with them !