Products

Hafnium Oxide Ceramics for Insulator

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Features

Hafnia has successfully replaced BeO in applications to 2500 C.
Standard sizes are available from stock, and custom sizes on request. For high density extrusions, please contact us.

Grades

HUH Grade

Typical density of this grade is 8.0-9.2 gm/cc, or about 90% of theoretical density. This is suitable for use in any sheathed application. Please review technical considerations for potential strength and shrinkage issues.

CUH Grade(and disclaimer!)

Typical density of this grade is 4.5-5.5 gm/cc, or about 50% of theoretical density. The crushable HfO₂ product is not a direct analog to our MgO product. Our MgO product is capable of easy loading, then crushing to a fine powder with one swaging or drawing.
The CUH grade is basically an “underfired” ceramic body. As a result, it is subject to further dimensional changes with use, but worse, it can partially sinter into abrasive particles at the low temperatures used for annealing between draws or swages. TATEHO OZARK does not recommend grade CUH for multi-pass cable production with metallurgically required annealing steps.
The CUH grade is suitable for single pass processing, or use without swaging. The user must be aware of the potential for further shrinkage of the insulators and stress to the conductors at high temperature use, as well as the potential development of void regions in the assembly due to shrinkage on the longitudinal axis.

DUH Grade (and disclaimer!)

TATEHO OZARK (sometimes) can offer an overly dense grade, typically 97% of theoretical density. This is not recommended for typical use because the insulator is very brittle as a result of excess grain growth. Availability depends on the status of current powder lots because they are not all suitable for hyper-dense production. There is no increased performance with DUH grade but it may be used to prevent assembly voids in high temperature long duration applications.

Chemical Composition(Typical)

TATEHO OZARK suggests the following specification for this product.
Hafnium Oxide Chemistry Specification (starting powder basis) – Typically
HfO₂ > 98%
HfO₂ + ZrO₂ > 99.8%

Standard Sizes

TATEHO OZARK maintains selected standard configurations as stock items and many other special sizes. The following sizes are usually in stock:

	Part No.	O.D.	I.D.
2-Hole Shapes	HUH2039x010	0.039	0.010
	HUH2048x012	0.048	0.012
	HUH2062x015	0.062	0.015
	HUH2075x018	0.075	0.018
	HUH2085x023	0.085	0.023
	HUH2093x024	0.093	0.024
	HUH2112x032	0.112	0.032
	HUH2125x035	0.125	0.035
	HUH2156x040	0.156	0.040
	HUH2180x045	0.180	0.045
1-Hole Shapes	HUH1062x031	0.062	0.031
	HUH1125x062	0.125	0.062
	HUH1125x085	0.125	0.085
4-Hole Shapes	HUH4125x023	0.125	0.023

Custom products are available only for orders that meet our minimum order value.

Please contact us for details regarding the minimum order amount.
Please allow up to 8 weeks for custom fabrication. Four hole and special configurations must be quoted on a custom basis.

Insulators are supplied in random lengths, normally between 1 and 4 inches. Longer lengths up to 9 inches may be available. TATEHO OZARK cannot guarantee the squareness or finish of the ends for small sizes or crushable composition. Insulators may also be obtained in soft-fired crushable form, please specify grade CUH.

*Export Control Statement – These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

CONTACT

For inquiries about Ozark or products, please contact.

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