Wheaton® Cryule® cryogenic ampules are available unscored and pre-scored and designed for biological sample preservation in glass. Pre-scored to eliminate filing. It is made from low extractable borosilicate glass that conforms to USP Type I and ASTM E 438 Type I, Class A requirements. Can be used in the vapor phase of liquid nitrogen. Special design allows for storage at low temperatures as well as rapid thawing.