Zero CTE Glass: ZERO™

Glass designed to minimize dimensional and positional variations caused by temperature changes

ZERØ™ is a glass with zero thermal expansion, effectively minimizing dimensional and positional changes due to temperature fluctuations. It is ideal for a wide range of components that require precise thermal stability.

Properties
Reference Data
Event Information

Properties

Coefficient of thermal expansion	-40-80℃	×10^-7/K	0
Young’s modulus		GPa	95
Vickers hardness	Hv		680
Specific gravity		×10³kg/m³	2.55
Refractive index	n_d		1.54
Refractive index	1550nm		1.53

Thermal expansion

Transmittance

Reference Data

Thermal conductivity	W/m・K	25℃	1.6
Thermal conductivity	W/m・K	100℃	1.7
Temperature diffusivity	×10^-6m²/s	25℃	0.8
Temperature diffusivity	×10^-6m²/s	100℃	0.75
Specific heat	kJ/(kg・K)	25℃	0.8
Specific heat	kJ/(kg・K)	100℃	0.9
Rigidity	GPa		39
Poisson’s ratio			0.2
Knoop hardness Hk			590
Abrasion Aa		JOGIS	50
Bending strength	MPa	3-point bending	180
Abbe number Vd			57
Photoelastic constant		×10^-6/MPa	3
Internal transmittance (10 mmt)	％	580nm	88
Internal transmittance (10 mmt)	％	1550nm	93
Water-resistance		JOGIS RW	Class1
Acid-resistance		JOGIS RA	Class1
Alkaline-resistance		ISO 10629	Class1
Volume resistivity (Log ρ)	Ω・cm	350℃	5.4
Dielectric constant		1MHz, 25℃	7.4
Dielectric constant		2.45GHz, 25℃	6.5
Dielectric loss tangent (tan δ)	×10^-3	1MHz, 25℃	17
Dielectric loss tangent (tan δ)	×10^-3	2.45GHz, 25℃	43