Alumina

NTK material name Principal component Color Specific gravity (g/cm3) Flexural strength (MPa) Young’s modulus elasticity (GPa) Vickers hardness (Hv) Fracture toughness (MPa-m1/2) Thermal expansion coefficient ( x 10-6/K) Thermal conductivity (W/mK) Thermal shock resistivity (ΔT°C) Volume resistivity (Ω・m) Dielectric constant (10 GHz) Dielectric loss tangent (10 GHz) Dielectric breakdown strength (KV/mm) Key characteristics Main applications
HA-92 Al2O3
92%
White 3.6 380 280 950 -- 7.6 23 160 >1012 8.6 8×10-4 15 <All-purpose material>
Good metalizing property
Excellent high-frequency property
Parts for electron tubes
High-vacuum seal parts
Parts for electrical insulation
Parts for high-frequency insulation
Feedthroughs
HA-95 Al2O3
95%
White 3.6 350 320 950 -- 7.7 27 160 >1012 8.8 6×10-4 15 <All-purpose material>
Good metalizing property
Excellent high-frequency property
Parts for electron tubes
High-vacuum seal parts
Parts for electrical insulation
Parts for high-frequency insulation
HA-921 Al2O3
92%
White 3.6 550 280 -- -- 7.6 18 170 >1012 8.8 1×10-3 15 Good metalizing property Heater
Substrates for deodorizing appliances
HA-997 Al2O3
99.7%
White 3.9 300 320 1400 -- 8.1 31 140 >1012 9.9 <1×10-4 17 Good metalizing property
Low dielectric loss
High-frequency property
Excellent resistance to corrosion
Parts for electron tubes
High-vacuum seal parts
Parts for electrical insulation
Parts for high-frequency insulation
KP-85 Al2O3
85%
White 3.3 250 -- -- -- 6.8 13 180 >109 -- -- 13 Excellent wear resistance
Excellent electrical insulation
Insulation parts
Insulator
Piezo-electrodes
KP-95 Al2O3
95%
White 3.7 350 320 1200 4 7.8 24 160 >1012 9.2 9×10-4 15 <All-purpose material>
Excellent wear resistance
Excellent resistance to corrosion
Excellent electrical insulation
High mechanical strength
Superior hardness
Excellent sliding property
Wear resistant parts
Sliding parts
Insulation parts
Production jigs and tools
Valve parts
Capstan. guide rollers
Spacers
Mechanical seals
Bearing parts
KP-921 Al2O3
92%
White 3.6 450 320 950 4 7.8 17 200 >1011 -- -- 15 High resistance to thermal shock
Excellent wear resistance
Excellent electrical insulation
High mechanical strength
Excellent sliding property
Wear resistant parts
Sliding parts
Heat resistant parts
Mechanical seals
Ceramic liners
KP-990 Al2O3
99.5%
White 3.9 500 380 1400 4 8.0 29 160 >1012 9.7 3×10-4 16 Excellent wear resistance
Excellent resistance to corrosion
High mechanical strength
Superior hardness
Excellent electrical insulation
Excellent sliding property
Wear resistant parts
Sliding parts
Corrosion resistant parts
Pump parts
Sliding parts
Jigs for semiconductor production
UHA-99 Al2O3
99%
White 3.9 520 380 1650 5 8.0 28 160 >1012 9.9 3×10-4 16 High mechanical strength
Excellent wear resistance
Excellent high-frequency property
Superior hardness
Structual parts for Wear resistance/
High-vacuum seal parts
Mechanical seals
C-W A2O3
85%
White 3.5 270 230 800 -- 6.8 13 -- -- -- -- -- Excellent impact resistance
Excellent wear resistance
Wear resistant parts
Rollers
Mill lining bricks
Corundit balls

Zirconia

NTK material name Principal component Color Specific gravity (g/cm3) Flexural strength (MPa) Young’s modulus elasticity (GPa) Vickers hardness (Hv) Fracture toughness (MPa-m1/2) Thermal expansion coefficient ( x 10-6/K) Thermal conductivity (W/mK) Thermal shock resistivity (ΔT°C) Volume resistivity (Ω・m) Dielectric constant (10 GHz) Dielectric loss tangent (10 GHz) Dielectric breakdown strength (KV/mm) Key characteristics Main applications
UTZ-40 ZrO2 White 6.1 1000 210 1200 6 10 3 300 >108 -- -- -- Excellent wear resistance
Excellent resistance to corrosion
Superior toughness
Superior heat insulation property
High mechanical strength
Superior hardness
Excellent sliding property
Smooth surface
Wear resistant parts
Sliding parts
Parts for metal molds
Production jigs /tools for production process
Pump parts
Tape guides

Silicon nitride

NTK material name Principal component Color Specific gravity (g/cm3) Flexural strength (MPa) Young’s modulus elasticity (GPa) Vickers hardness (Hv) Fracture toughness (MPa-m1/2) Thermal expansion coefficient ( x 10-6/K) Thermal conductivity (W/mK) Thermal shock resistivity (ΔT°C) Volume resistivity (Ω・m) Dielectric constant (10 GHz) Dielectric loss tangent (10 GHz) Dielectric breakdown strength (KV/mm) Key characteristics Main applications
EC-141 Si3N4 Gray 3.2 1000 320 1500 6 2.8 29 >880 >1012 -- -- 16 Excellent wear resistance
Excellent electrical insulation
High resistance to thermal shock
Superior heat and mechanical strength
Superior hardness
Superior toughness
Excellent sliding property
Excellent resistance to heat and corrosion
Light weight
Low thermal expansion
Ball for bearing, roller
Squeeze roll for electric resistance welded tubes
Rocker arm tip, tappet, valve, etc.
Automobile engine parts (Rocker arm tip, valve, etc.)
Industrial parts (bearings, rollers, etc.)
SX6 Si3N4 Dark gray 3.2 1200 320 1550 7 3.0 50 -- -- -- -- -- Excellent wear resistance
High resistance to thermal shock
Superior heat and mechanical strength
Superior hardness
Superior toughness
Low thermal expansion
Excellent resistance to heat and corrosion
Light weight
Cutting tools
Wear resistant parts

Cemented carbide

NTK material name Principal component Color Specific gravity (g/cm3) Flexural strength (MPa) Young’s modulus elasticity (GPa) Vickers hardness (Hv) Fracture toughness (MPa-m1/2) Thermal expansion coefficient ( x 10-6/K) Thermal conductivity (W/mK) Thermal shock resistivity (ΔT°C) Volume resistivity (Ω・m) Dielectric constant (10 GHz) Dielectric loss tangent (10 GHz) Dielectric breakdown strength (KV/mm) Key characteristics Main applications
KM3 WC Silver 14.4 3000 580 -- 12 5.8 63 -- -- -- -- -- High mechanical strength
Superior toughness
High resistance to thermal shock
Cutting tools
Wear resistant parts
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