I-880 and I-850 soda-lime glass, with a mid-range thermal longitudinal expansion coefficient a (20 °C … 300 °C) = 8.8 × 10^-6 K^-1 , conforms to the hydrolytic class HGB 3 in accordance with DIN ISO 719. Tubes and rods of this glass are suitable for versatile uses thanks to its well-adapted properties.