These clear glass vials are manufactured from Wheaton '200' low extractable borosilicate glass to maintain uniform wall thickness. The amber vials are manufactured from Wheaton '320'  borosilicate glass.

• Blowback feature in the neck and a specially designed bottom radius for added strength
• These features are important for freeze-drying applications
• Vials are provided in shrink-wrapped modules which greatly reduces particulate contamination