Macerite series

Our original machinable ceramics (ceramics with excellent machining characteristics). The Macerite lineup includes ET, SP, HSP mica based products, as well as Macerite PN, a boron nitride based formulation. The excellent machining characteristics of these products allows creation of complex shapes and micron-order accuracy.


Material with excellent thermal shock strength and low thermal expansion.
Excellent light reflectance with high degree of whiteness, Macerite-ET has been widely used in reflectors in various fields including YAG laser oscillators.


Inexpensive, general-grade material in the Macerite series. Suitable for large parts.


HIP processed Macerite-SP. An optimum material for fine machining because of its pore-less characteristics.


High strength material suitable for precision machining. The low coefficient of thermal expansion approaches that of silicon.

Material characteristics

Name Macerite-ET Macerite-SP Macerite-HSP Macerite-PN
Composition Fluorphlogopite (KMg3AlSi3O10F2) BN+α
Color white ivory ivory grey
Bulk Density g/cm3 2.46 2.50 2.67 3.10
Water Adsorption Ratio % 0 0 0 0
Flexural Strength MPa 140 110 160 290
Compressive Strength MPa - 430 440 -
Young's Modulus GPa 61 64 65 120
Hardness GPa 2.6 2.2 2.2 1.7
Electrical Resistivity [RT] Ω・cm >1014 >1015 >1015 >1014
Dielectric Constant [RT] 6 6 6.5 7
Dielectric Strength kV/mm 10 10 10 10
Thermal Expansion Coefficient [RT-200℃] X10-6/℃ 5.8 9.2 9.8 4.2
Thermal Conductivity W/(m・K) 1.4 1.6 1.6 -
Thermal Shock Resistance ⊿T 350 150 175 650

* The data indicated herein is representative values and not guaranteed values.

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