Glossary of Refractory Terms and related Products name starting with alphabet G

Refractory Technology Terms

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Ganister

(a) A silica rock formed by deposition of dissolved silica in the siliceous seat-earth of coal-seams.

(b) A dense, high-silica rock (quartzite), suitable for the manufacture of silica brick. Confusion sometimes results from the use of this term because it is also applied, in some parts of the USA, to the crushed firebrick or to mixtures of either crushed firebrick or silica rock with clay, for use in tamped linings.

Gate or Stopper

Movable piece used to control the flow of glass into a revolving pot of a suction-fed machine.

Gathering hole

An opening in the breast wall through which glass is gathered.

Git or Sprue

The metal which solidifies in the hollow casting-pit refractories, at the end of teeming.

Gob

A portion of molten refined glass which is either delivered by feeder or gathered on a gathering iron for fabrication on to a glass object.

Grading

Used in three senses:

1. Texture: grain-size distribution of a mix.

2. Grain-size analysis: process of separating a mixture of particles into definite size fractions, for the purpose of determining their proportions.

3. Blending: mixing together of different sized grains to obtain a desired texture.

Green strength

Mechanical strength of a ceramic product in the green state.

Grog

(a) Used or unused firebrick crushed and then used as a non-plastic material.

(b) Crushed firebrick or other calcined or fused materials (used or not used) for incorporation in a batch as a non-plastic material. The term is sometimes used to include a Chamotte.

(c) Burned refractory material usually calcined clay or crushed brick, added to a brick or mortar mix or sometimes castable to reduce shrinkage in drying and firing.

Ground fireclay mortar

A refractory mortar consisting of finely ground fireclay.    

Grout

A suspension of mortar material in water, of such consistency that when it is poured upon horizontal course of brick masonry, it will flow into vertical open joints.

Guard ring

(a) In various methods of measuring thermal conductivity, the test piece on which the measurement is made is placed centrally in the apparatus and is surrounded by a guard ring.

(b) A device for maintaining a unidirectional flow of heat through the test piece, in the measurement of thermal conductivity.

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