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Lava - Alumina Silicate L911A

OVERVIEW of Lava - Alumina Silicate L911A

Machinable Alumina Silicate L911A (Lava)
  • Aluminum silicate is machinable in an unfired state and used in applications up to 1000 F
  • After firing, parts are as hard as carbide & usable up to 2100 F
  • Aluminum silicate has low thermal expansion Aluminum silicate is low cost
  • Aluminum silicate is available in wide range of stock up to 12" in diameter.

    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.
  • FEATURES AND BENEFITS of Lava - Alumina Silicate L911A

    Machinable Alumina Silicate L911A (Lava) - Send your request today.
    Applications include: prototype hardware, insulators, bushings, soldering fixtures, nozzles, welding tips or whatever you need.
    (LAVA) Lava - Alumina Silicate L911A
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