Borofloat 33® & Duran Tubing Data

Mechanical Properties

• Density (25°C)  ρ 2.2g/ cm3
• Young’s Modulas E 64 kN/mm2
• Poisson’s Ratio μ 0.2
• Knoop Hardness HK 0.1/20 480
• Bending Strength σ 25 MPa

Thermal Properties

• Coefficient of Linear Thermal Expansion α (20-300°C) 3.25 x 10^-6/°K
• Specific Heat Capacity cp (20-100°C) 0.83 KJ/kg°K
• Thermal Conductivity λ (90°C) 1.2 W/m°K

Optical Properties at λ = 589.3 nm

• Index of Refraction n 1.47133
• Abbe Constant ve=(n_e-1)/(n_f΄-n_c’) 65.41
• Refractive Index n_d (λ_587.6nm) 1.47140
• Dispersion n_F-n_C 71.4 x 10^-4
• Stress Optical Coefficient K 4.0 x 10^-6mm²/N

Available Glass Sizes