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KILN SHELVES

Refractory materials Kiln Furniture

Walker Ceramics stock high quality cordiorite kiln furniture specifically developed to withstand the demanding variety of conditions in the Ceramic field. These refractories are suitable for temperatures up to 1300 C and will give long service life with a minimum of bending. It's property of low thermal expansion is an extremely important characteristic of fast firing cycles. They have been proven in industrial factories worldwide in the manufacture of all ceramic products.
The craftsmen potter and production potter are both served by these refractories providing a sound base for the finished ware. We also advise and service Industry's requirements. We carry an extensive range of sizes and thickness in all shelves but should you require a non standard size for your kiln a cutting service is available for a nominal cutting charge.

Cordiorite Kiln Shelves
The following information is intended for assistance in obtaining the best results from your kiln furniture.

1. Cordiorite shelves are for use up to cone 10 firing with minimal distortion under proper loading and usage. This enables Cordiorite to withstand a very large number of firing cycles.

2. Low thermal expansion combined with high total porosity results in excellent thermal shock resistance, so that fast cycles can be achieved.

3. Low density, resulting in lower proportion of heat being absorbed by the kiln furniture.

4. Cordiorite does not expand or shrink.

Selection of Shelf Thickness
The selection of shelf thickness is governed by the following factors:
1. The maximum temperature.
2. The time held at that temperature.
3. The size of the shelf.
4. The atmosphere conditions i.e. reducing or oxidising .
5. The average load to be supported.
6. The distance apart of the props .
7. The amount of bending that can be tolerated during the expected life of the shelf.
The following guide will be helpful until a more accurate determination can be made in the light of experience.

Biscuit and Earthenware Gloss - 980-1120C Small shelves or light loads - 10mm to 13mm thick. Larger shelves or heavy loads- 15mm thick

Stoneware Small Shelves or light loads - 20mm thick Larger shelves or heavy loads - 25mm thick Extra heavy loads - 30mm thick.

Bending
Most shelves will ultimately bend if heavily loaded and used at high temperatures. Where conditions of reduction are experienced the shelf may bend more quickly. Under these conditions a compromise is often necessary. Timely rotation on props and occasional reversal is a normal industrial practice to retain flatness. Three props are better than four being inherently stable, ideally each prop being placed directly over the other.

ND	KILN SHELVES
ND30	305 x 305 x 6 mm 12 x 12 x ¼"
ND70	305 x 305 x 12.5 mm 12 x 12 x ½"
ND80	330 x 330 x 12.5 mm 13 x 13 x ½"
ND90	406 x 406 x 12.5 mm 16 x 16 x ½"
ND100	457 x 305 x 12.5 mm 18 x 12 x ½"
ND105	457 x 457 x 12.5 mm 18 x 18 x ½"
ND110	508 x 508 x 12.5 mm 20 x 20 x ½"
ND125	279 x 279 x 16 mm 11 x 11 x 5/8"
ND130	330 x 330 x 16 mm 13 x 13 x 5/8"
ND135	343 x 343 x 15 mm 13½ x 13½ x 5/8"
ND140	406 x 406 x 15 mm 16 x 16 x 5/8"
ND150	457 x 305 x 15 mm 18 x 12 x 5/8"
ND170	457 x 457 x 15 mm 18 x 18 x 5/8"
ND173	457 x 330 x 15 mm 18 x 13 x 5/8"
ND174	500 x 450 x 15 mm 19.5/8 x 17¾" x 5/8 "
ND180	508 x 508 x 15 mm 20 x 20 x 5/8"
ND190	610 x 305 x 15 mm 24 x 12 x 5/8"
ND200	610 x 457 x 15 mm 24 x 18 x 5/8"
ND220	406 x 406 x 20 mm 16 x 16 x ¾"
ND230	457 x 305 x 20 mm 18 x 12 x ¾"
ND235	457 x 330 x 20 mm 18 x 13 x ¾"
ND240	457 x 457 x 20 mm 18 x 18 x ¾"
ND253	533 x 533 x 20 mm 21 x 21 x ¾"
ND255	559 x 279 x 20 mm 22 x 11 x ¾"
ND257	558 x 558 x 20 mm 22 x 22 x ¾"
ND260	610 x 305 x 20 mm 24 x 12 x ¾"
ND265	610 x 406 x 20 mm 24 x 16 x ¾"
ND270	610 x 457 x 20 mm 24 x 18 x ¾"
ND275	610 x 610 x 20 mm 24 x 24 x ¾"
ND277	660 x 330 x 20 mm 26 x 13 x ¾"
ND278	660 x 660 x 19 mm 26 x 26 x ¾"
ND280	406 x 406 x 25 mm 16 x 16 x 1"
ND290	457 x 457 x 25 mm 18 x 18 x 1"
ND295	508 x 508 x 25 mm 20 x 20 x 1"
ND310	610 x 305 x 25 mm 24 x 12 x 1"
ND330	610 x 457 x 25 mm 24 x 18 x 1"
ND340	610 x 610 x 25 mm 24 x 24 x 1"
ND360	700 x 610 x 25 mm 27½ x 24 x 1"
ND362	880 x 495 x 25 mm 34.5/8 x 19½ x 1"
ND368	610 x 610 x 32 mm 24 x 24 x 1¼"
ND770	279 x 279 x 13 mm 11 x 11 x ½"

NB	SHELF CUTTING Shelves can be cut to your needs
NB380	Up to and Inc. 330mm (13") Per Cut
NB385	Over 330mm (13") Per Cut

Refractory materials Kiln Furniture

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Copyright © 2009 David Walker / Ozclay Pty. Ltd. All rights reserved.
Revised: January 28, 2010 .