The Combined Nomenclature (CN), v1:2022
tubes of glass having a linear coefficient of expansion <= 5 x 10-6 per kelvin within a temperature range of 0°C to 300°C)
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=497f7f14-fa7f-4071-9de4-1b84ac270444