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Technical Products, Inc
P.O. Box 189, Hubertus, WI 53033
Phone (262) 335-3635 * Fax (262) 335-3606 * Toll Free (800) 869-2008
E-mail: tpi@technicalproductsinc.com



Complete Ceramic Services
Lowest Competitive Pricing / Quick Delivery / Top Quality / Expert Design and Technical Assistance
Distributor * Fabricator * Prototype & Production

Alumina Silicate L911A:

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VERSATILE * SUPER MACHINABILITY *LOWEST COST

We have tons of the finest quality Grade "A" Lava (Alumina Silicate) in stock and ready to deliver. Top quality and low prices- an unbeatable combination.

General

Grade "A" Lava is a natural ceramic material. In chemical terms it is a hydrous alumina silicate. We supply this material in standard rods, blocks, and plates as well as special shapes.

Machining

Unfired Grade "A" Lava is a free machining material that can be shaped using most machine tools. The material is non-toxic but as with any airborn dust it could a be respiratory irritant if directly inhaled. Common sense and dust collection systems are recommended.

Firing

The following procedure should be followed carefully to avoid cracking:

Machined parts should be placed in a cool furnace and protected from direct heat radiation. The use of refractory furniture, boxes,or baffles is recommended. A heating rate of 200 - 250º F per hour is typical. The rate of heating should not exceed 300º F per hour.

Parts with cross sections exceeding 1/2" are more critical and cracking may occur during the firing cycle. If a cross section of 1/2" or greater is unavoidable, a heating rate of approximately 50º - 150º F per hour and strategically placed stress relief holes may help minimize cracking.

The maturing temperature of Grade "A" Lava is between 1850º and 2000º F. The temperature should be maintained for approximately 30 minutes up to 1/4" cross section and 45 minutes for 1/2" and greater cross sections. Fired pieces may be removed from the furnace after cooling below 200º F.

During the firing process, Grade "A" Lava expands approximately 2%. A temperature of 2000º F should not be exceeded. If 2000º F is exceeded, crystallization, distortion, shrinkage and a loss of stated material properties will occur.

As with most natural materials, texture, color, hardness, machinability, final expansion, and ideal firing temperatures may vary.

Please feel free to contact our technical staff with any additional questions that you may have.

Note:

The information provided on this page is given as a guideline only. Specific applications may require other processes.

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Last updated: 8/13/2008