What Is Refractory Grog

What is the purpose of grog?

Grog is used in pottery and sculpture to add a gritty, rustic texture called “tooth”; it reduces shrinkage and aids even drying. This prevents defects such as cracking, crows feet patterning, and lamination. The coarse particles open the green clay body to allow gases to escape.

What is fire brick grog?

The mix of Firebrick Grog which is a refractory or heat resistant aggregate, mixed with a heat resistant cement, like Cement Fondu, is often referred to as castable, which is suitable for making pizza ovens and other outdoor ovens. Firebrick Grog is also suitable for the roman block method of mould making.

Can you throw clay with grog?

It can also be made from ground-up brick and other refractory rock. ‘Refractory’ simply means that the material is resistant to melting and can survive high temperatures. Grog can be added to almost all types of clay.

What is high grog?

Grogs are raw materials that contains high amounts of silica and alumina, and can be added to clay bodies for increased strength and/or texture. High grog content clay bodies are not always ideal for throwing, however, because the grittiness can be too rough on the hands and can cause skin irritation.

How is grog made?

Grog is, most simply, a mixture of water and rum, with more complicated versions adding spices, citrus fruits, or sugar. Grog dates from the mid-18th century, when it was introduced as a way of reducing drunkenness on ships in the British Royal Navy. Nutmeg was traditionally used to spice up grog.

Is Terracotta a clay?

Terracotta, terra cotta, or terra-cotta (pronounced [ˌtɛrraˈkɔtta]; Italian: “baked earth”, from the Latin terra cocta), a type of earthenware, is a clay-based unglazed or glazed ceramic, where the fired body is porous.

How can clay that is fired become plastic again?

It can also be made into plastic again if it is soaked in water for a few days. It can still be recycled by soaking it a long time in water to regain its moisture. Bisque. Clay is in the bisque, or bisqueware, stage after it has been fired in a kiln once.

What does greenware mean in pottery?

Greenware is unfired clay pottery referring to a stage of production when the clay is mostly dry (leather hard) but has not yet been fired in a kiln. At this stage, it is still possible to work the object by adding more clay, or wetting it so it softens and then reshaping it.

How much grog do I add to clay?

A sculpture clay body, for example, typically has 15-25% grog (but can have much more). Since grog is typically prefired, its does not normally undergo a firing shrinkage (unless the body in which it is a part is fired to a temperature higher than the grog was initially fired at).

How do you play grog?

One player is chosen as the Grog and their objective is to tag all of the Seekers, freezing them in place (just like freeze tag). They can be unfrozen by Seekers that are still mobile with a simple tag, though. The Grog enters the playing space first and hides. Then the Seekers come in looking for the flashlight parts.

What does slip mean in pottery?

Slip (noun) is a liquefied suspension of clay particles in water. It differs from its very close relative, slurry, in that it is generally thinner. Slip has more clay content than its other close relative, engobe. Slip is usually the consistency of heavy cream.

What percent alcohol is grog?

Until the grog ration was discontinued in 1970, Royal Navy rum was 95.5 proof, or 54.6% alcohol by volume; the usual ration was an eighth of a pint, diluted 2:1 with water (3:1 until World War II).

Why did Pirates drink rum?

Rum, distilled from sugar, however, was cheaper to transport and so became a staple export. This meant that many of the ships attacked by pirates were laden with barrels of rum, ripe for the taking. They could be sold for a pretty price, but pirates tended to drink a fair chunk of this kind of loot.

What did Vikings drink?

Vikings brewed their own beer, mead, and wine. Mead, however (often considered a drink of royalty), was most likely reserved for special occasions.

Are clay pots better than terracotta?

However, ceramic pots are typically glazed with a coat of lacquer that prevents the soil from drying out at the same speed as it would in an unglazed clay or terracotta planter. Even with drainage holes, the glazes on ceramics will still cause these pots to retain more moisture than unpainted terracotta.

Is terracotta better than clay?

The Difference Between Clay and Terra-cotta Typically, terra-cotta objects may be made of any types of organic clay, but earthenware clay has the brown-orange color that is also known as terra-cotta. Terra-cotta products are fired to low temperatures and result in a more porous and permeable surface.

What is the strongest clay?

In fact, Kato Polyclay is considered to be the strongest clay available, making permanent works of art that will resist breaking and wear over time.

Can you apply slip to bone dry clay?

Because the slip shrinks it will tend to flake or peel of bone dry clay. Regular slip is, therefore, best applied to soft or leather hard clay. However, you can also use a slip trailer to apply engobe. In this case, it is possible to slip trail onto bone dry clay and bisque ware too.

Does clay expand when fired?

If you fired high enough, the clay would first swell up (bloat) then fuse into a liquid which would cool as a glass.

Does clay shrink when fired?

Clay shrinks both in drying and in firing. Different clay bodies shrink at different rates which can be as little as 4%, or as much as 15% for some clay bodies. Our testing showed that about 5% shrink during the drying process, 1/2% during bisque firing (cone 06) and 5.5% during glaze firing (cone 6).