CLEARCERAM-Z

Suitable for extreme temperature environments or very high precision applications

An ultra-low thermal expansion glass-ceramic developed and manufactured by Japan’s Obara Corporation is a similar material to Zerodur (Schott) and ULE (Corning).

Product Data

Property Category	Property	Unit	Regular	HS	EX
Thermal Properties	Coefficient of Thermal Expansion (0–50℃)	10⁻⁷/°C	0.0 ± 1.0	0.0 ± 0.2	0.0 ± 0.1
Thermal Properties	Thermal Conductivity (k)	W/m·°C	1.51	1.54	1.49
Mechanical Properties	Young’s Modulus (E)	GPa	90	92	91
	Rigidity	GPa	36	37	37
	Poisson’s Ratio	—	0.25	0.25	0.25
	Knoop Hardness (Hk)*	—	600 (6)	590 (6)	620 (6)
	Abrasion (Aa)*	—	62	62	62
	Bending Strength***	MPa	216	122	126
	Specific Gravity (d)	—	2.55	2.55	2.55
Optical Properties	Refractive Index (nd)	—	1.546	1.547	1.546
	Refractive Index at 1550nm	—	1.528	1.528	1.528
	Abbe Number (νd)	—	55.5	54.9	55.5
	Internal Transmittance at 500nm	—	0.89	0.89	0.89
	Internal Transmittance at 980nm	—	> 0.98	> 0.98	> 0.98
	Internal Transmittance at 1550nm	—	> 0.98	> 0.98	> 0.98
Chemical Properties	Water Resistance (Powder)* (RW(P))	—	Class 2	Class 1	Class 1
	Acid Resistance (Powder)* (RA(P))	—	Class 1	Class 1	Class 1
	Alkali Resistance (Powder)* (Ralk(P))	%	0.25	0.19	0.18

Regular, HS and EX are three different grades or types of this material, corresponding to different performance optimization directions.

Regular:General purpose, balanced performance;
HS:Strengthening of mechanical properties;
EX:Highest thermal stability for extreme temperature environments or very high precision applications.

Applications

Space optical equipment
Vacuum interferometry platform
Atomic clock/ion trap structure
High-stability laser resonant cavity frame
Laser gyroscope system
Lightweight reflector
Precision sensing platform

Capabilities and Services

We can reliably customize the most complex optical components to support the world’s most challenging projects

Material: Zerodur, CLEARCERAM-Z, ULE, fused silica
Lightweight: up to 70% weight reduction
Minimum order quantity: one piece
Fast delivery cycle: prototypes can be completed in as fast as 7 days
On-time delivery rate: more than 99% on-time delivery rate
Maximum size supported: 500*500mm

FAQs

Can CLEARCERAM-Z be machined?

Yes. CLEARCERAM-Z is a machinable ultra-low expansion glass-ceramic. It can be cut, ground, polished, and drilled using diamond or carbide tools. Jundro Ceramics is a professional supplier with extensive experience in precision machining, prototyping, and small-batch production of CLEARCERAM-Z components for optics, metrology, and semiconductor applications.

Can CLEARCERAM-Z replace Zerodur or NEXCERA?

Yes, in many applications. CLEARCERAM-Z provides:

Ultra-low thermal expansion comparable to Zerodur and NEXCERA
High dimensional stability under temperature changes
Excellent homogeneity for precision optics and measurement systems

It is suitable for optical benches, mirrors, precision tooling, and metrology instruments, especially where cost or availability favors CLEARCERAM-Z.

What is the approximate price of CLEARCERAM-Z?

The price depends on part size, grade, surface finish, and machining complexity.

As a high-performance ultra-low expansion ceramic, it is generally more expensive than standard glass or fused silica but often slightly lower cost than Zerodur for small or prototype components.
Jundro Ceramics can provide custom quotes based on geometry, tolerance, and batch size.

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