Hi All !!!
I’ve had my fantastic Denby stoneware since the 80’s. I’ve been reheating food on my wonderful Denby stoneware dinner plates in a microwave for roughly two decades without any problem. Suddenly my luck has changed: In the last month I have lost three plates in the microwave while heating food. All three end up with a hairline crack from the rim to approximately the centre of the plate. At least two (and likely 3) of the plates were at room temperature. One plate had liquid and solid food on it and a microwave lid. My last cracked plate had beets from a can on it (no lid) … No problems with my soup bowls in microwave.
Only change I can think of is I have switched from using dishwasher liquid detergent to using automatic dishwasher tabs in disolving wraps. The ingredients are oxygen-based bleaching agent, polycarboxylates, non ionic surfactants, enzymes (no chlorine, no phosphate, no perfume). My changing to the use of these dishwasher tabs may correspond exactly to the start of my plates cracking. Possibly some residue is left on the plates which causes a reaction in the microwave???
Could it be the microwave is doing odd things? i.e. time to get a new microwave?
Seems odd to go twenty years doing the same thing on a daily basis without problem and then crack, crack, crack … three plates in 30 days!!!
Hope someone has ideas…not cheap to replace these gems!!! 