Jon Fairbairn wrote:

What's the issue with porcelain tiles? The porcelain tiles I used on my
kitchen worktop are really quite easy to work. Presumably there's more
than one type of porcelain tile? These are made of the same stuff all
the way through, no glaze.


I was unaware of any difference until I tried drilling the last lot of
floor tiles I bought. Hard as hell. I've drilled tiles fairly easily
over the years with an ordinary masonry bit, but these latest ones are a
real struggle and blunt the bits very easily, even with cooling water
spray. There must be "porcelain" and "porcelain"?

--
David in Normandy.
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