Refractory Materials
FIRE BRICKS
R.I.26 Firebricks (Product Code PA35)
These bricks measure 229 x 114 x 76mm. They are a high grade
refractory insulating brick for use to a maximum temperature of 1430°C. They
are for gas kilns firing Stoneware.
AIR SET JOINTING CEMENT (Product Code PA25)
Air set jointing cement is a fine, plastic air-setting
refractory mortar, based on suitably grade and processed silimanitic aggregates
with the requisite chemical and ceramic bonds. It hardens at normal atmospheric
temperatures, and further hardens with the application of heat, to give a strong
gas-tight joint in the service temperature range of up to 1550°C.
Ready to use from the container, for the bonding of refractory
bricks when building a gas fired pottery kiln. When laying bricks, the thinnest
joint possible, will give the best results. If thick joints are required, mix
equal parts of cement with finely crushed fire brick grog.
Do not use this product near the elements in an electric kiln.
If patching, use the same method as used for thick joints.
DRYING
It is preferable to dry out this product as soon as possible
after the completion of the required work. Use a slow fire bringing the
temperature up to 300°C eventually.
Left over cement can be left in the container, level off the
surface and cover with a little clean water. In order to prevent premature
hardening of the cement, due to exposure to the atmosphere, keep the container
well sealed when not in use.
Air set jointing cement contains caustic alkali silicates and
care must be taken to avoid contact with the eyes and skin. If splashed in the
eyes, wash well with clean water for at least 15 minutes and seek medical
attention if irritation persists.
VERMICULITE (Product Code PA40)
Vermiculite is used as an insulation between the outer
wall and inner wall of pottery kilns and furnaces.
We recommend the following uses:-
a) As a loose fill when used in the vertical plane of the
kiln. It should be consolidated during installation. This can be done by pouring
10cm deep at a time and then gently compressing it about 10%, or if this is not
possible by tamping with a rod or vibrating it.
b) For use on the top edge of arches. A concrete can be mixed
by using 5 parts vermiculite to 1 part of Cement Fondu.
Vermiculite concrete can be mixed by either machine or by
hand. It is important not to over mix as this can lead to undue compaction,
higher density and balling up. The vermiculite and cement should be mixed
together dry before adding water. It is an advantage where possible to spray
water into the mix or to pour it from a watering can fitted with a rose, as the
even distribution makes it possible to reduce the total water content.
Durablanket - (Kaowool / fibrefrax / ceramic fibre....)
A heat resistant, man made fibre, very much like houshold
insulation, used to line kilns. Available by the roll or in meter lengths and
1mm, 25mm & 50mm thickness. The material is easily cut with a sharp knife
and applied using Air Set Jointing Cement. Protective clothing of gloves, mask
and a long sleeved shirt are recommended when handling this material as it may
irritate the eyes, nose and skin.
