Save time and reduce errors Wheaton prescored ampules eliminate filing. Stems can be pull-sealed or tip-sealed to create an effective hermetically sealed container. A Gold Band identifies the prescored feature. Clear ampules are manufactured from Wheaton 33 brand borosilicate glass, which meets USP Type I standards. To protect light-sensitive samples, amber ampules are manufactured from Wheaton 320 brand amber borosilicate glass, which meets USP Type I and ASTM Type I, Class B standards.