Dremel 876 Specifications download pdf (Page 14)

Glaze Firing

Many of the low fire glazes work on greenware

(unfired) projects. Most all clear glazes work well, test

others. These pieces need to be absolutely dry after glazing

and fired like a bisque firing. The good news is you save

one firing. The bad news is

that if something explodes in

a kiln, the exploded glazed

piece sticks to other pieces.

This can only be removed

with a grinder or Dremel

tool.

Cadmium reds can be

very temperamental. If not

applied or fired incorrectly

they turn a transparent gray.

The mauve, rosy colors are

less temperamental, but if

you feel the need for red and

it doesn’t work for you try:

• A heavier application

of glaze

• Leave more room around

pieces or peeps out, as

they like oxygen.

• Fire faster

Cracks and Breakage:

Greenware is extremely

brittle. Repairing student

work can be tricky. Mayco,

as well as many other

manufacturers, sell products

to repair greenware.

Cracks do not automati-

cally happen. It is usually

because the project has a thick and thin piece attached

together. The thinner piece dries and shrinks away from the

other. If you are making thick animals with 4th graders they

may need to be hollowed out from the underside with a loop

tool. Poking holes with a needle took or bamboo skewer

may also help in drying and firing.

Explosions in kilns are usually from one of two things:

• The work is not completely dry. The dryer the better.

If there is a small particle of water on the interior of a clay

project, it has to migrate to the surface to evaporate. If it

doesn’t have a chance to evaporate, it will turn to steam

when fired and the piece will break in the kiln.

• Air Pockets. If students put two pieces together with

air trapped between them, it is necessary to pierce the

work with a pin tool to let the air out. This can be a very

small hole in a place that is not visible. If the air pocket is

trapped when the kiln is fired it will expand while the clay

contracts and the piece will break when fired in the kiln.

Firing

If a teacher does not

have enough kiln

space for separate

bisque and glaze

firing, save time by

doing a single firing

when using Stroke &

Coat®. Many other

Mayco products can

be used in a single

fire process. Test

them individually.

If you need to

combine a glaze fire

and bisque fire, place

the glaze pieces in the

cooler part of the kiln

and the clay pieces in

the hotter part.

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Dremel 876 Specifications Page 14

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