Glass Test Tubes, all sizes

These high-quality borosilicate glass test tubes make for an excellent addition to any labware collection!

These glass test tubes are made of borosilicate glass that's similar to Pyrex or Kimax, and they have clear marking spots for your lab labeling needs. Compared to clear plastic test tubes, these glass culture tubes / sample tubes have greater chemical resistance and can be heated directly in an open flame.

Choose from sizes small to extra-large in these round bottom borosilicate test tubes with beaded rims. Compared to rimless test tubes, beaded rims add strength and assist in handling.

• The small test tubes are 100 mm tall x 13 mm with 11 mm inside diameter. Volume is approximately 9 ml. Use with No. 00 rubber stoppers or No. 2 cork stoppers.
• The large test tubes are 150 mm tall x 16 mm with 14 mm inside diameter. Approximate volume is 22 ml. Use with No. 0 rubber stoppers or No. 4 cork stoppers. This size is the best for general use.  
• The extra-large test tubes are 150 mm tall x 20 mm with 17 mm inside diameter and approximately 28 ml volume. Use with No. 1 rubber stoppers. 

Since test tubes do not have flat bottoms, a test tube rack is essential in order to keep them upright during your experiments!

Looking for a more kid-friendly test tube set? Check out this 6-pack of plastic test tubes that comes with screw caps; it works perfectly for students as young as 5 years old.