Is a coffee mug range safe? I"d like to make French Onion soup au gratin in a mug. My worry is the mug shattering while the food is being served.

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I at this time bake the french onion soup at 450°F, however I"m curious about broiling as well.


Hello Justin,

First the all, a question prefer this should be answered by an professional in products science, and also I’m not. Bear that in mind when you read the following.

Generally, you should not take it because that granted the coffee mugs room oven safe. Quite simply, some are and also some room not.

However, high quality coffee mugs created for the catering industry; specifically the white ones with no decor, are usually oven safe. Nevertheless, I will not provide you any type of guarantee.

Basically, coffee mugs can not be regarded as range safe, unless the manufacturer have declared so v a rubber stamp underneath or otherwise have actually published some type of guarantee, and also the manufacturer is a respected and also well-known entity within the industry.

Why coffee mugs aren’t always oven safe

A coffee mug isn’t always what that seems. Coffee mugs come in plenty of varieties, room made from different materials, different in decoration, and also so on.

Moreover, coffee, tea, hot chocolate, and other warm drinks typically served in mugs, are seldom; check out never, offered at temperatures over 100 ºC / 212 ºF. However, as result of competition, one-of-a-kind on revenue items, and so on, coffee mugs of short quality might not be able to withstand temperatures much greater than this. The reason is simply that manufacturers, or the manufacturers’ customers, desire to save a couple of pennies to get a sector advantage. Over there might additionally be a customer demand because that cheap low quality coffee mugs.


Most coffee mugs space made native some kind of ceramic. Others space made from wood, plastic, clay, pewter, steel, and also a long list of other materials. Obviously, few of these materials will never ever be reckoned as range safe. To store it simple, ok stick to ceramic for the reminding component of this answer, although various other materials might be range safe.

Ceramics typically found in a kitchen environment encompass Earthenware, Stoneware, Porcelain, and also Bone china. Of these Earthenware and also Bone china are seldom, read never, reckoned as range safe, back this isn’t fully true as much as Bone china is concerned. Nevertheless, just a finish idiot would use a Bone china mug to make French Onion soup au gratin, cup cakes or any type of other sort of food.

That pipeline us v Stoneware and also Porcelain. Both Stoneware and porcelain are usually oven safe, uneven decor elements have been included after the finale glaze is applied and the coffee mug is baked in a furnace.

One last remark needs to it is in added about coffee mugs made out of thin porcelain. Although these mugs might an extremely well withstand the heat, it’s recipient to ensure that they room not exposed to any type of other type of force while hot, e.g. Taken on without care.

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Further information around Coffee Mugs, and links to various other resources, deserve to be found at Wikipedia: Coffee Mug.