ENGINEERING CERAMICS

We use the world's highest class high-purity alumina, and produce 3D shapes and sizes that were once considered impossible with conventional ceramics. You can expect a reduction in material and processing costs, as we can produce materials close to the final shape required.

New Form of Fine Ceramics “ Repton™”

Our in-house facilities and network enable ultra-high precision finish machining.

The ribbed structure takes advantage of the high Young's modulus to achieve a balance between light weight and rigidity.
Material: Alumina99.6% Young's modulus: 395GPa

The Qualities of Repton™

Small quantity

3D molding

Precision
manufacturing

We have used our unique near-net molding to our advantage to earn a high reputation in across diverse fields, including semiconductor and LCD manufacturing equipment, as well as powder processing equipment.
In addition, we can accommodate near-net shapes, including that needed for the world's largest high-purity alumina, large rib-structured products and long guides, and more, covering shapes that are considered impossible by other companies.
Many shapes can only be manufactured using our methods, including core structures and hollow structures, because it is able to handle small products (several millimeters to large products (three-meters)).

Physical Properties Chart

General Properties	Physical properties Unit Test methodProduct name Component	136	006	516	838	848	907
	Physical properties Unit Test methodProduct name Component	Al₂O₃ 99.8%	Al₂O₃ 99.99%	Al₂O₃ 85%	ZrO₂ Yttria-stabilized	ZrO₂ Yttria-stabilized	Y₂O₃ 99.9%
	Bulk Specific Gravity JIS R1634	3.9	3.9	3.8	6.0	6.0	4.9
	Porosity(％) JIS R1634	0	0	0	0	0	0
Mechanical Properties	Vickers Hardness(GPa)	18	20	10	20	14	5.4
	Bending Strength(MPa) ※(1) JIS R1601	392	400	276	1050	1050	150
	Compressive Strength(MPa)	2370	-	-	-	-	-
	Young’s Modulus(GPa) Ultrasonic pulse method	392	397	278	215	223	175
	Poisson's Ratio	0.23	0.22	0.23	0.3	0.31	0.31
	Fracture Toughness(SEPB) (MPa・m_1/2) JIS R1607	4.0	-	-	-	8	0.7
Thermal Properties	Coeffcient of Thermal Expansion 100→500℃ (×10_-6) JIS R1618	6.8	6.8	7.6	10.6	10.4	7.1
	Thermal Conductivity 20℃(W/(m・k)) JIS R1611	34.3	32.5	11	2.8	3	13
	Specific Heat(J/(kg・K)) JIS R1611	0.78× 10₃	0.77× 10₃	0.76× 10₃	0.43× 10₃	0.46× 10₃	0.42× 10₃
Electrical Properties	Dielectric Breakdown Voltage(V/m) JIS C2141	1.3×10₇	1.6×10₇	1.5×10₇	1.3×10₇	1.3×10₇	1.4×10₇
	Volume Resistivity 20℃(Ω・cm) JIS C2141	5.4×10₁₄	4.2×10₁₅	4.1×10₁₁	3.7×10₁₀	3.8×10₁₀	3.2×10₁₂
	Dielectric Constant 1MHz 3-terminal method	9.3	9.6	10.3	33.5	32.5	11.4
	Dielectric Loss Tangent 1MHz (×10₄)	3.5	2.0	80	25	26	12
Characteristic / Usage		Various industrial materials	Various industrial materials	black low-reflection materials （wavelength 400）	Yttria 3mol Various industrial materials	Yttria 3mol alumina-bonded type Various industrial materials	plasma-resistant applications

*The data are representative values, not guaranteed values.

*(1)3-point bending test

*PDF will be displayed, so please click the print button.

Precision manufacturing

We respond to diversifying needs, from grinding and polishing using our own company's equipment to ultra-precision finishing using our network.

To the Precision
manufacturing page.

Rib 3D structure

Using a rib structure that takes advantage of high-purity alumina's high Young's modulus, we achieve a balance between light weight and rigidity.

Long guides

These guides use high-purity alumina and are mainly used in semiconductor and liquid crystal manufacturing equipment. They can accomodate total lengths of up to 3,100mm. Please contact us for cross-sectional shapes.

Various small products

We can accomodate near-net shapes starting from just a few millimeters in size. Taking advantage of the characteristics of ceramics, we have been positively evaluated in various fields dealing with industrial equipment.

Low-reflection black alumina

This is a ceramic that suppresses reflectiveness all while maintaining its rigidity and strength, such as is necessary for optical processing equipment. It also supports near-net shapes.

Yttria

This is a ceramic that suppresses reflectiveness all while maintaining its rigidity and strength, such as is necessary for optical processing equipment. It also supports near-net shapes.

Micro holes

The MH series allows for countless fine through holes by unique molding method. Please consult us for details on the holes' sizes and shapes, including Φ././ and long holes, all of which do not require processing.

Porous ceramics

The Repton air permeable series supports various applications, including filters and adsorbtive plates. Black porous products are also available and have been highly evaluated in various fields.