The Combined Nomenclature (CN), v1:2024
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=ff35b666-b08b-41b5-bea1-78e213f89ca8