Glass beads

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Density: 2.5 g/ml
Refractive index: 1.51-1.52
Compressive strength (psi average): 36,000
Poisson’s Ratio (psi): 0.21
Rigidity Modulus (psi): 4.3 x million
Young’s Modulus (psi): 10 million
Hardness (Knoop 100 g load): 515 kg/mm2
Coefficient of friction (static): 0.9-1.0
Chemical composition: soda-lime silica glass
Softening point (dilatometer): 589 °C
Expansion Coefficient (25-300 °C): 85 x 10 million per °C
Strain point: 505 °C
Annealing point: 548 °C
Dielectric Constant: 1 Kc 7.6 D.C.
Volume Resistivity (Ohm-cm): 25 °C 6.5 trillion
Lost tangent: 1 Kc 2.0% 100 Kc 1.0%.

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