Miele Dishwasher Уход и обслуживание - Страница 23

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3.7 Porcelain

Porcelain, the most revered fine ceramic material, consists of approx. 50%

kaolin, 25% quartz and 25% felspar. These components are ground finely

together and mixed with water to produce a moldable material. After

molding, pieces are first dried and then fired at approx. 1650°F. After the

application of glaze, they are fired again, this time at a higher temperature of

approx. 2550°F.

The finished porcelain does not just have a high chemical resistance to all

detergents, cleaners and foodstuffs, it is also extremely hard (harder than

steel). Porcelain also has high heat retention and good sheeting properties.

This combination ensures good drying results.

Porcelain is available either in plain white or decorated to a lesser or greater

extent. The different types of decoration are as follows:

1. In-glaze decoration:

The colored design is applied to the previously glazed item,

which is then fired at temperatures from 2100°F to 2280°F. The

colors then penetrate the re-softened glaze. The glaze then

surrounds the color pigments and thus protects the design. As a

result of this, porcelain with in-glaze decoration is dishwasher-

proof.

2. Under-glaze decoration:

With this version the colored decoration is protected against the

effects of the suds by a layer of glaze. The majority of porcelain

currently on the market with this type of finish is dishwasher-

proof.

3. On-glaze decoration:

Porcelain decorated in this manner has less resistance. The

colored decoration is applied directly on the surface of the

porcelain and fired at a relatively low temperature of approx.

1470°F. Such items are only dishwasher-proof to a very limited

extent.

Note

Gold decoration is always applied on the glaze and is not

dishwasher-proof.

Technical Information