MACHINING SUGGESTIONS:
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-Any standard tooling works, however, we recommend CARBIDE tipped tooling for
production runs.
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-The material (Grade "A" LAVA) expands 2% when fired to 2000 degree Fahrenheit,
therefore, you must machine your parts 2% undersize IN EVERY DIMENSION.
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-Use shop vacuum at source of machine to collect dust.
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-Medium to high speed is used for machining. Where deep holes are required, use an open
spiral drill and only drill down 1/4" at a time - withdraw drill and clear flutes of dust - then
resume drilling.
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-We do not recommend firing parts with wall thickness over approximately 3/ 8" to avoid
firing cracks. Wherever possible, keep the walls as thin as practical. Drill extra holes
whenever possible to help in the expansions and contractions during the firing process.
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- Lava is converted into a very hard material after it is fired. For close dimensional control,
parts may be ground after firing. Fired lava is usually ground wet.
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FIRING SUGGESTIONS:
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- Place part in cool furnace (kiln) shielded from any direct flame by refractory boxes or
baffles.
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-Take temperature up SLOWLY at approximately 250 degree Fahrenheit per hour until
the maximum temperature of 2000 F. has been reached.
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-At 2000 F., allow furnace to "soak" for 45 minutes. Then, turn off source of heat and
allow furnace to cool to room temperature before opening. DO NOT FORCE TO COOL.
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WE DO CUSTOM FIRING AT NOMINAL CHARGES...
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Important:
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-All technical data printed herein is believed to be accurate and correct, however, we
make no specific warrant to that effect.
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-Since the materials offered herein are entirely Nature made, we can only make a
consorted effort to supply the raw materials as flaw-ftee as possible. Color and hardness
does vary slightly from block to block, however, its uses remain quite constant.
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