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Forsterite/Forsterite brown

Forsterite

MgO-Al2O3-SiO2 ceramics are composed of 2MgO-SiO2 (also called Mg2SiO4) forsterite crystals.
Our forsterite is free of magnesia crystals (periclase).
NAC manufactures forsterite using carefully selected materials and under dense and meticulous quality control.

Feature

フォルステライト

Forsterite is widely used as an electrically insulating material because of its light yellow appearance, smooth surface, and high strength. 
It is also useful as a high-frequency insulating material because of its low dielectric constant of 6.5 and low dielectric loss tangent (Tanδ).
It is used in insulating parts for vacuum tubes and base materials for metal film resistors, where adhesion to metal is essential because of its significant coefficient of thermal expansion (8 to 12 x 10-6/°C).

FB-10 Forsterite brown

FB-10　フォルステライト茶色 A brownish-red ceramic mainly used for optical components, it has a coefficient of thermal expansion of 8.98 × 10-6/°C in the temperature range -30°C to 70°C. It has good bonding properties with glass.
Temperature Range Thermal Expansion Coefficient
30～600℃ 11.1×10-6/℃
-30～70℃ 8.98×10-6/℃

Forsterite Characteristics

Characteristics Representative Value Representative Value
Nishimura No. N-75 FB-10
Main Component 2MgO・SiO2 2MgO・SiO2
Color Pale Yellow Dark Brown
Bulk Density 3.0 3.2
Water Absorption Rate 0% 0%
Bending Strength 150MPa 187MPa
Permittivity 6.5（1MHz） ―
Dielectric Tangent 3×10-4（1MHz） ―
Thermal Expansion Coefficient 9.7×10-6/℃ 11.1×10-6/℃
Thermal Conductivity 3.35 w/m･k 5.9 w/m･k
Maximum Operating Temperature 1000℃ 1000℃