Description General description Amber Sample Vials in Lab File (With Caps Attached). Attached caps help maintain cleanliness. Supplied in partitioned trays to provide an easy way to store empty vials or to inventory samples. • Amber vials are manufactured from Wheaton 320 glass that conforms to USP Type I requirements to protect light-sensitive samples. • Screw caps are attached to vials. • It is suggested to use rubber lined caps for aqueous samples, and PTFE faced rubber lined caps for organic samples. • Vials and caps are autoclavable. • 2 mL vials fit the M-T Vial File, 228778. • 4 mL vials fit the M-T Vial File, 228780. Legal Information WHEATON is a registered trademark of Wheaton Industries, Inc.