48PK Test Tubes, 15ml, Superior Heat & Chemical Durability

Set of 48 test tubes made of high quality Borosilicate 3.3 Glass. 15ml capacity. Tubes feature uniform, 1.2mm walls and beaded rims.
Each tube measures 5.1" (130mm) tall, with an outer diameter of 0.6" (15mm). Inner diameter measures 13.8mm. Accommodates stoppers with a bottom diameter of 12-12.5mm & top diameter of 15-17mm. (Compatible stoppers can be found by searching ASIN: B013TMXG8I).

Autoclavable, with superior chemical durability. Low temperature gradient- can withstand direct flame, high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.