Pyrex® Test Tubes, Beaded Rim, Capacity 20 mL, Corning (CAT#: STEM-L-3819-LKN)

Borosilicate glass test tubes with beaded rim. Made from special machine-made tubing to achieve optimum wall thickness. Well annealed, resistant to heat, and chemically stable. Rims are fire-polished. These test tubes are available in 3 mL, 5 mL, 9 mL, 14 mL, 20 mL, 27 mL, 35 mL, 55 mL, and 70 mL capacities. Each tube has a marking spot on the surface except 25 mm O.D. tubes.

Sterility: non-sterile
O.D. × L: 16 mm × 150 mm
Capacity: 20 mL

Plain neck.
Round bottom.
Graduations: no.