Applying heat to one part of a dish causes that part to expand more than the cooler parts. This temperature differential can put the dish under so much stress that it can crack or shatter.
The tendency to crack under these conditions is to do with thermal shock. If ceramic ware breaks or shatters due to sudden temperature change, this is referred to as thermal shock. It occurs when the ceramic material cannot manage rapid expansion or contraction caused by sudden temperature changes. Some earthenware ceramics like terracotta can cope with being used on a hob, but porcelain will not. Another feature of porcelain that makes it a good candidate for ovenware is that it is very strong and durable.
Porcelain is made out of fine-grained materials, so a porcelain finish looks refined. In addition to this, porcelain is often made out of kaolin clay, which is pure and free of impurities. This is the reason that porcelain is normally a lovely white color.
The properties of looking smooth, refined and white can give porcelain a delicate appearance. However, this appearance is deceptive. Porcelain is, in fact, a dense, hard material.
As such it is a good candidate for being used as ovenware. Its durability means that it can survive inevitable bumps of being taken in and out of the oven. As stated earlier, one of the key ingredients in porcelain is feldspars. These are minerals, which when heated up turn into a glassy liquid.
The glassy liquid fills up any pores between clay particles. When the dish cools after firing, the glass turns solid and creates a very hard, dense material. As a result, porcelain dishes are vitreous. This is another way of saying that they are vitrified. In practical terms, this means that they are solid, dense, and non-porous. By contrast, some other ceramic ware is not vitrified.
An example of this is earthenware pottery like terracotta. Terracotta does not have the same number of glass-forming materials in the clay. So, it does not vitrify when it is fired. As a result, it remains porous and weaker than porcelain. So, whilst terra cotta might be more resistant to thermal shock, it is less tough than porcelain. The other advantage of porcelain is that it is, as mentioned above, non-porous. Because of the vitrification process described above, any gaps between clay particles in the porcelain are filled up with glass.
Most often, pottery that is being used as oven ware will be glazed. This means that it is coated with a glassy material that repels liquid. However, most often it will be glazed.
This material is very strong and durable. A baking dish made of porcelain is also very resistant to thermal shock and can hold high temperatures. Cooking Tips. Is Porcelain good for baking? Published on October 1, The characteristics of porcelain Porcelain is a kind of ceramic used for many things such as tiles, bathroom floors, sinks but also dinnerware and bakeware.
It is a suitable material for baking in the oven. Earthenware is made of a white, porous clay that is fired at a lower temperature than stoneware, generally about 1, degrees Fahrenheit. It is sometimes called ceramic ware. Earthenware is also glazed and re-fired for a durable finish.
Depending on the composition of the materials, earthenware may or may not be oven-proof, though most types are microwave-safe. Ironstone is a type of clay dinnerware that was originally reinforced with particles of iron slag, feldspar and bit of cobalt, according to write Denise Andre of the White Ironstone China Association website. When in doubt about the over-proof characteristics of your ironstone pieces, take a safe approach and only use them to warm foods at low temperatures in the oven below degrees Fahrenheit.
Porcelain is a white clay mixture that is fired at over 2, degrees Fahrenheit. It is usually thinner and lighter than stoneware plates and bowls with a translucent appearance. Most porcelain dinnerware should not be placed into conventional ovens. However, some types of porcelain are made to be oven-proof and can be used safely to warm foods. Formulas for porcelain can vary widely, with some containing glass or bone ash. This variance can make it difficult to determine whether older pieces of porcelain are oven-proof or not.
If you are unsure of the plate's composition, avoid using it in conventional ovens.
0コメント