Products

Crushable insulators are rigid tubes, rods, and multi-hole configurations available at lengths up to about 200 mm and generally round (not required) configurations of constant cross-section (required). This product is analogous to it’s MgO cousins, but is made from high quality Aluminum Oxide powders. TATEHO OZARK can extrude a variety of Alumina powders. For high density extrusions, please contact us.

TATEHO OZARK offers two fundamental varieties and each has special concerns.

CCA grade is made from a vapor phase Alumina feed which is 99.9% pure. The high purity is obtained by synthesizing the product from pure elements instead of naturally occurring feedstocks. This process results in a small particle size and high surface area which makes the powder thermally reactive. This limits it’s use for simple one or two pass compactions, just enough to tighten the components in the sensor. It is not recommended for progressive drawing and annealing cycles which are typically performed to remove work hardening from the wire and sheath.
The high surface reactivity also complicates fabrication by TATEHO OZARK and requires that OD sizes greater than 5 mm require dimensional tolerance concessions.

CUA and CHA grades are fused Alpha Alumina products which are typically about 99.65% pure. The CUA grade is intended to meet ASTM type 1 specifications, but availability is unpredictable.
These products are much less reactive and are typically fired above 1300 C.

See specifications for typical composition of aluminum oxide grades.
The following are typical analyses or limits for powders used to produce extruded insulators. All raw materials are high quality fused grain powders which are processed in-house to obtain optimum particle size distributions for end use as crushable or swageable thermocouple insulators.