Wheaton Liquid Scintillation Vials are designed for compatibility with all scintillation counters that accommodate 20mL vials. Choose from a variety of vial, cap and liner materials. They come packaged in five utility trays that are each partitioned to hold 100 vials and double as a convenient way to store samples. All vials are 20mL in size. Glass Vials are made from WHEATON 180 low potassium borosilicate glass that conforms to ASTM E438 Type I, Class A and USP Type I requirements. Background counts are consistent and low; ultraviolet transmission is high.