Smeg S200EB/1 - Manual (Page 12)

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Instructions for the user
7.3.2 Kitchenware
Not all kitchenware is suitable for use with microwave cooking.
Do not use the following, for example:
1
closed containers, closed bottles, tins: high pressure can build up inside
them which could cause them to explode;
2 closed metal containers;
3 metal cutlery;
4 lead crystal;
5 crockery with knurled edges;
6 non heat-resistant plastics;
7 silver-plated paper or tin foil;
8 kitchenware with metal parts from which the covering has not been
completely removed;
9 plastic kitchenware which can fuse at high temperatures;
10 porcelain kitchenware with handles or knobs in which dampness might
collect, which could create high pressure and cause these items to
break;
11 in the case of foods being cooked in "throwaway" paper containers,
check the oven frequently for the possible presence of flames.