Bulk Borosilicate Glass Chromatography Vials are available with crimp or screw necks. These plain vials are available with large or standard openings. Type I Borosilicate Glass provides excellent protection against chemical attack. Borosilicate glass has a higher softening point for greater heat resistance. It is more resistant to thermal shock and when broken, borosilicate glass tends to crack into large pieces rather than shattering. Packed in 20 modules of 100. Closures sold separately.