Zirconium Oxide ZrO2
Known for their high mechanical strength and fracture toughness, zirconias are ideal for extreme mechanical environments, particularly impact prone applications. Certain zirconia compositions provide enhanced fatigue loading resistance.

Zirconias are toughened with the addition of Yttria (Y) or Magnesium Oxide (MgO) to exhibit different properties. Yttria-stabilized zirconia’s best strengths include exceptional toughness, flexural strength, and high-temperature stability. Magnesia-stabilized zirconia are commonly selected for severe-duty applications.

Primary Features

  • High mechanical strength
  • Enhanced fracture toughness (impact resistance)
  • Mechanical strength
  • High-heat resistance
  • Thermal expansion near metal
  • Corrosion resistance
  • Natural lubricity


  • Wear-resistant components
  • Mechanical components
  • Tools and molds
  • Fluid handling
  • Heat insulation material

High-performance zirconia star gear for use in high-performance machineryZirconia slotted filter for fluid handling applicationsZirconia seal ring for use in fluid handling applicationsheavy-duty sorting component made from high-performance zirconia ceramics for use in harsh-duty fluid handling applicationsZirconia ceramic tip and brazed steel screw for use in semiconductor manufacturing equipment


  • KMT-ZrO2 — 95% ZrO2 (white)
  • KMT-ZrO2Mg — 96.5% ZrO2 (yellow/white)

Material Properties for KemaTek™ Zirconias

Properties Units Test Zirconias — ZrO2
Material Name KMT-ZrO2 KMT-ZrO2Mg
Color White Yellow/White
Primary Material Content 95% ZrO2 96.5% ZrO2
Characteristics High mechanical strength, good wear and heat resistance High mechanical strength and toughness, good wear and corrosion resistance. Good thermal shock resistance
Applications Wear and heat-resistant components
Bulk Density g/cc ASTM-C20 6.02 5.72
Water Absorption % ASTM-C373 0 0
Vickers Hardness (Load 500 g) GPa ASTM-C1327-03 13.0 12.0
Flexural Strength MPa ASTM-C1161-02c 1250 900
Compressive Strength MPa ASTM-C773 5690 1900
Young’s Modulus of Elasticity GPa ASTM-C1198-01 210 200
Poisson’s Ratio ASTM-C1198-01 0.31 0.30
Fracture Toughness MPa * m12 ASTM-C1421-01b (Kevron notched beam) 6 — 7 9 — 10
Coefficient of Linear Thermal Expansion, 40-400 ℃ x 10-6/℃ ASTM-C372-94 10.0 9.0
Thermal Conductivity, 20℃ W/(m • K) ASTM-C408-88 3 3
Specific Heat J/(Kg • K) x 103 ASTM-E1269 0.46 0.47
Thermal Shock Resistance Note 1 350
Volume Resistivity, 20℃ Ω • cm ASTM-D257-99 ≥1011
Dielectric Strength KV/mm ASTM-D149-97
Dielectric Constant, 1 MHz ASTM-D150-98 (1 MHz)
Loss Tangent (x 10-4 ASTM-D150-98 (1 MHz)
Nitric Acid 60% 90℃ WT Loss (mg/cm2/day) 0.0
Sulphuric Acid 95%, 95℃ WT Loss (mg/cm2/day) <0.04
Caustic Soda 30%, 95℃ WT Loss (mg/cm2/day) <0.08

Technical ceramics material properties chart
Ceramic Materials Properties Chart — All Materials — PDF, 128K

For more information or to get a quote on your next refurbishment project, please contact us.