material | Borosilicate glass tube 3.3 | physical characteristics | Numerical Value | Unit | ||
color | transparent / opaque white / opaque black / transparent black / dark blue | Coefficient of Mean Linear Thermal Expansion(ISO 7991) | 3.3±0.1 | 10 -6 K -1 | ||
Optional diameter | 4mm ~ 315mm | Transformation Temperature | 525±15 | °C | ||
Softening Point (ISO 7884-6) | 820±10 | °C | ||||
Wall thickness | 0.8mm ~ 12mm | Working Point (ISO 7884-2, ISO 7884-5) | 1260±20 | °C | ||
Length | 5mm ~ 3000mm | Upper Cooling Temperature (ISO 7884-7) | 560 | °C | ||
laboratory equipment, optics, medical treatment, daily glassware, solar energy, test tube, etc. | Lower Cooling Temperature (ISO 7884-7) | 510 | °C | |||
Density at 20°C | 2.23±0.02 | g/cm 3 | ||||
Conventional dimensions | Thermal Conductivity (20°C--100°C) | 1.2 | w/m 2 K | |||
Specific heat capacity at constant pressure | 0.8× 10 3 | J×/Kg@K | ||||
chemical composition | SiO2:81% B2O3:13% Na2O+K2O:4% Al2O3:2% | Modulus of elasticity | 64 × 10 3 | MPa | ||
size | Accept special size customization | Tensile strength | 35-100 | MPa | ||
Poisson constant | 0.2 | |||||
Refractive Index | 0.92 |