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          Custom-made Ceramic
          and Glass Components

          Shapal?Hi-M soft Analysis

          Comparison of Shapal™-M soft with Shapal™ Hi-M soft and traditional ceramics

          This information is provided to help existing users of Shapal™-M soft compare it with the new Shapal™ Hi-M soft material and also to help users of traditional ceramics evaluate this machinable ceramic for their application.

          Comparison of flexural strengths and thermal conductivities (Typical Data)

          Data Supplied by Tokuyama Corporation, Tokyo, Japan

          Impurities

          Element Shapal™-M soft Shapal™ Hi-M soft
           C  300ppm 300ppm
          Ca 450ppm 1300ppm
          Cr 60ppm 1ppm
          Mg 15ppm 1ppm
          Ni <5ppm 2ppm
          Fe 20ppm 8ppm
          Si <15ppm 40ppm
          O 0.5% 0.9%
          Ti <1 <20
          Property/Test Conditions Shapal™-M soft Shapal™ Hi-M soft Units
          GENERAL      
          Density Corrected to 4°C 2.88 2.88 g/cm³
          Porosity 25°C 0 0 %
          ELECTRICAL      
          Volume Resistivity 25°C, DC 1.4 x 1012 1.0 x 1015 Ωcm 
          Dissipation Factor (tan δ) 25°C, 1MHz 9.1 x 10-4 10 x 10-4  
          Dielectric Constant (ε) 25°C, 1MHz 6.9 6.8  
          Dielectric Strength
          56 65 kV/mm
          THERMAL      
          Thermal Expansion Coefficient RT~400°C 4.4 x 10-6 4.8 x 10-6 /°C
          Thermal Expansion Coefficient RT~600°C 4.8 x 10-6 4.9 x 10-6 /°C
          Thermal Expansion Coefficient RT~800°C 5.1 x 10-6 5.0 x 10-6 /°C
          Thermal Conductivity 25°C 96 92 W/mK
          Maximum Use Temp. (in air) 1,000 1,000 °C
          Maximum Use Temp (in nonoxidizing atmosphere) 1,900 1,900 °C
          Thermal Shock Resistance ∆t water quench 400 400 °C
          MECHANICAL      
          Bending Strength 25°C 273 300 MPa 
          Compressive Strength 25°C 120 100 kg/mm2
          Young's Modulus 25°C 1.9 x 104 1.8 x 104 kg/mm2
          Poisson's Ratio 25°C 0.31 0.31  
          Vickers Hardness (Hv) 25°C, 300g 390 380 kg/mm2
          CHEMICAL DURABILITY      
          Resistance to Acid 10%HCI 24Hrs, 25°C 0.2 0.2 mg/cm2 wt loss
          Resistance to Base 10%NaOH 24Hrs, 25°C 60 60 mg/cm2 wt loss

          Note:  Shapal™ is a registered trademark of Tokuyama Corporation, Tokyo, Japan

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