Macor (Machinable Glass Ceramic) - An Overview

Material: Macor (Machinable Glass Ceramic) - An Overview
Composition: 46% SiO2/16% Al2O3/7% B2O3/ 10% K2O/17% MgO
Property Minimum Value (S.I.) Maximum Value (S.I.) Units (S.I.) Minimum Value (Imp.) Maximum Value (Imp.) Units (Imp.)
Atomic Volume (average) 0.009 0.0095 m3/kmol 549.213 579.725 in3/kmol
Density 2.49 2.54 Mg/m3 155.446 158.567 lb/ft3
Energy Content 20 25 MJ/kg 2166.77 2708.47 kcal/lb
Bulk Modulus 51.87 54.5 GPa 7.5231 7.90455 106 psi
Compressive Strength 328.5 362.2 MPa 47.6449 52.5327 ksi
Ductility 0 0 0 0 NULL
Elastic Limit 32.9 36.2 MPa 4.77174 5.25037 ksi
Endurance Limit 31.15 34.42 MPa 4.51792 4.99219 ksi
Fracture Toughness 1.46 1.6 MPa.m1/2 1.32867 1.45607 ksi.in1/2
Hardness 1350 4200 MPa 195.801 609.159 ksi
Loss Coefficient 5e-005 0.0002 5e-005 0.0002 NULL
Modulus of Rupture 89.5 105 MPa 12.9809 15.229 ksi
Poisson's Ratio 0.28 0.29 0.28 0.29 NULL
Shear Modulus 25.33 26.6 GPa 3.6738 3.858 106 psi
Tensile Strength 32.9 36.2 MPa 4.77174 5.25037 ksi
Young's Modulus 65.3 68.67 GPa 9.47096 9.95974 106 psi
Glass Temperature 1430 1700 K 2114.33 2600.33 °F
Latent Heat of Fusion kJ/kg BTU/lb
Maximum Service Temperature 1073 1273 K 1471.73 1831.73 °F
Melting Point K °F
Minimum Service Temperature 0 K -459.67 °F
Specific Heat 774 805 J/kg.K 0.598966 0.622956 BTU/lb.F
Thermal Conductivity 1.4 1.56 W/m.K 2.62085 2.92037 BTU.ft/h.ft2.F
Thermal Expansion 12.7 13.2 10-6/K 22.86 23.76 10-6/°F
Breakdown Potential 38.4 41.6 MV/m 975.36 1056.64 V/mil
Dielectric Constant 5.6 6.1 5.6 6.1 NULL
Resistivity 1e+022 1e+024 10-8 ohm.m 1e+022 1e+024 10-8 ohm.m
Environmental Properties
  Resistance Factors
1=Poor 5=Excellent
Flammability 5
Fresh Water 5
Organic Solvents 5
Oxidation at 500C 5
Sea Water 5
Strong Acid 4
Strong Alkalis 4
UV 5
Wear 5
Weak Acid 5
Weak Alkalis 5