Whilst tidying the garage, I found some angle grinder discs with "use by" dates on them. They were use by 2012. Does that mean I should bin them? Why do some makes have a use by date and others do not? What happens to the disc after this date: does it become more brittle?
FWIW the ones with the dates were Silverline from toolstation. I had a couple of stone cutting discs that I had forgotten about because I upgraded and used diamond discs but their metal cutting discs also have dates on. The other assorted makes I have seen over the years do not seem to have dates on them but I imagine they are made the same so would be subject to the same aging processes?