Clear Borosilicate Glass Vials, 15mL with Cone Lined Caps, case/144

21 x 70mm, 4 dram (15mL) Clear Borosilicate Glass Vial with 18-400 Black Phenolic Poly Cone Lined Cap attached. Clear vials offer maximum visibility. Made of Type I Borosilicate glass, providing exceptional resistance to heat shock and chemical leaching. The glass is non-porous and has no catalytic affect. Because the boron oxide particles in the glass are so small, the silicate is held more closely together, resulting in a much stronger glass for your laboratory needs. Attached Black Phenolic caps with Polyseal cone liners form an exceptionally tight seal and offer a good chemical barrier. This liner molds itself around the sealing areas of the finish as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, binding and backing off.