These 6 mL disposable glass sample vials are economical when used as liquid scintillation vials. They are manufactured from Wheaton 180 low potassium borosilicate glass that conforms to ASTM Type I, Class A requirements. Vials are packed in individual cells in trays of 200. Vials in trays are shrink-wrapped in plastic for protection against contamination. Catalog number 986491 is specially designed for those instruments requiring a cap smaller in diameter than the vial to prevent jamming.