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Repairing a Ceramic Fiber Kiln

Apply a heavy coat of QF-180 to the surfaces, and press the ceramic fiber pieces together.


Repairing a Ceramic Fiber Kiln

Reader Response: Staining glass with silver

Recent Q&As: Fusing copper, silver, or gold wire into glass; the steel base plate under the kiln

Memorable Quote

News: 200-Year-Old Stoneware Bottle Containing Alcohol Found in Shipwreck



Two materials are included in ceramic fiber repair kits: AS-40 and QF-180.

AS-40 Rigidizer is a thin, clear or translucent liquid. AS-40 can be used to harden a ceramic fiber surface.

QF-180 Adhesive looks like Elmer’s white glue. Please do not allow QF-180 to freeze. This may reduce its effectiveness. Do not try to fill voids in ceramic fiber with QF-180. It is a ceramic fiber adhesive and not a filler.

Vacuum the area to be repaired. Before gluing ceramic fiber pieces together, paint AS-40 to both surfaces to wet them. Then apply a heavy coat of QF-180 to the surfaces, and press the ceramic fiber pieces together. The QF-180 should be applied heavily enough to ooze out of the joints. If you are gluing ceramic fiber into a kiln lid, insert long pins at an angle to hold the pieces together until they dry. Or prop a small piece of wood against the repaired piece. Remove the pins or prop after the repaired section has dried for 48 hours. When done correctly, the glued joint will be stronger than the fiber body itself.

Q. Should the AS-40 rigidizer and QF-180 adhesive be mixed together?

A. No. Mixing the glue with rigidizer would lower the viscosity and may increase drying shrinkage.



In the last Kiln Pointer, Jean Talbott wrote that silver produces interesting effects in certain glasses.

Roxane Rolingson of Leming Glass & Ceramic Studio in Corpus Christi, Texas wrote, “In the 14th century, the leaded window glass makers discovered that silver would produce a yellow stain when fired on glass. This was a bit of a revolution as they were then able to have two different colors on the same piece of glass, allowing more versatility in window design. Subsequently the term stained glass was born.

“I always wondered how the accidental discovery was made,” Roxane added. “In view of the recent discussions in your newsletter, I wonder if the glass artists were making double use of the kilns where they fired the black and brown pigment glass paints. As in ‘Woops! What's this yellow stain we keep getting on the glass?’ The only stain in stained glass is silver stain, which gives a light yellow to deep amber. All other colors are metal oxides added to the ingredient batch when making the glass.”



Q. Thanks for your ever interesting emails. After reading today’s Kiln Pointer email, it sounds like we should not combine metal with glass to create a unique piece. Am I correct in this assumption?

A. No, you can successfully fuse copper, silver or gold wire between sheets of glass. In "Kiln Fired Glass: Copper & Metal Inclusions," the late Boyce Lundstrom describes unique and beautiful projects of fused copper and glass.

Q. Your last newsletter explained why a space was needed under the kiln. The bottom pan rotted out of my old Paragon kiln. Will the bricks fall out? I have put some bricks under the stand in the center just in case. Is this a problem?

A. It is rare for a firebrick bottom to collapse. Nevertheless, for added support, I recommend replacing a corroded steel base plate under the firebrick bottom.

Bricks placed under the center of the kiln may absorb heat. This could lower the temperature of the bottom section of the firing chamber. Instead, I recommend using the kiln stand designed for your model. For stability, it must be in good condition.



“The last of the human freedoms--the ability to choose one’s attitude in any given set of circumstances.” –Victor Frankl, a psychiatrist who survived Auschwitz, writing about concentration camps



You may have heard of the ancient Roman clay vessels containing liquids that were found years ago. Last June, another stoneware bottle was found in a shipwreck in the Baltic Sea near Poland. Though only 200 years old, new compared to the Roman discoveries, the bottle shows the enduring quality of pottery.

“Selters” is stamped on the side of the 34-ounce stoneware bottle, which still contained gin or vodka. “The bottle dates back to the period of 1806-1830,” said Tomasz Bednarz, an underwater archaeologist at the National Maritime Museum. The stoneware bottle was made in Ranschbach, Germany.


Have you ever noticed that some people seem to have everything "together"? They have somehow found a way to be happy and to remove the friction from their lives. Tyrone, an employee at Paragon, may be an example of this. A few weeks ago he said he inadvertently stepped on his glasses. I asked, "Did you get angry?" "No," he answered. "That wouldn't fix my glasses, would it?" We laughed together.

Thank you,

With best wishes,

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

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

Copyright 2014, by Paragon Industries, L.P.

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