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How to Avoid Kiln Shelf Breakage


Shelves and posts are used to separate ware inside a kiln.

CONTENTS

How to Avoid Kiln Shelf Breakage

Recent Q&A: temperature response time in a digital controller

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HOW TO AVOID KILN SHELF BREAKAGE

One time I crash-cooled a kiln by propping the lid with a post. When I returned to the kiln later, a shelf had cracked in half. Cooling a kiln too fast can cause this, especially if shelves are loaded with anything that retains heat longer than the shelf would. In the above example, I had two firebricks on the middle of the shelf.

Make sure the shelves do not touch a kiln wall during firing.

Store shelves vertically. If you stack them horizontally on top of each other, they break easily especially if a piece of clay or glass is between them.

Do not fire moist shelves. If they have been stored in a humid area, dry them by firing to several hundred degrees. If you dry more than one shelf, separate them with posts.

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RECENT Q&A

Q. When I open the door of my kiln to check my cloisonné enameling, the kiln temperature drops to 1300 degrees F or so. After I close the door, the temperature goes down for 10-20 seconds before it slowly goes up again. What is the reason for the delay in temperature rise?

A. Every 10 seconds, the digital controller calculates whether to adjust the temperature. The temperature didn’t rise because the controller had already decided that during the next 10 seconds, the elements should remain off. The controller made that calculation before you opened the door. It was only after the 10 seconds that the controller recalculated the temperature and turned on the elements.

Every 10 seconds, the controller can turn on the elements, leave them turned off, or turn them on for part of that period. Once you begin to understand how a digital kiln works, it doesn’t seem so intimidating.

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Last week my wife, daughter-in-law, and I drove 3,400 miles round trip to Cape May, New Jersey. It was an unforgettable odyssey. Snow-covered Cape May was quiet, almost deserted, and beautiful this time of year.

Thank you,

With best wishes,

Arnold Howard Paragon Industries, L.P. – Better Designed Kilns 2011 South Town East Blvd. Mesquite, TX 75149-1122 Voice: 972-288-7557 & 800-876-4328 / Fax: 972-222-0646 ahoward@paragonweb.com / www.paragonweb.com

PRIVACY NOTICE: Under no circumstance do we share or sell your email address.

Copyright 2007, by Paragon Industries, L.P.



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