These Serum Tubing Vials have a blowback feature in the neck and bottom radius for excellent strength; ideal for freeze drying (lyophilization).

TheClear Vials are constructed from Wheaton 200� low-extractable borosilicate glass tubing and meet ASTM Type I, Class A and USP Type I standards. While theAmber Vials are made from Wheaton 320� borosilicate glass and meet ASTM Type I, Class B and USP Type I standards. All vials are shrink-wrapped, to reduce particulate contamination. Autoclavable.