WHEATON® Scintillation Vials, 22-400 Finish with Metal Foil Lined Urea Caps (20mL LS Vial, HDPE, PP Cap, Foil Liner) 20mL LS Vials (Liquid Scintillation Vial) , HDPE, PP Cap, Foil Liner. These 20 mL vials are manufactured from high density polyethylene. Vials with caps attached are packaged in individual cells in trays of 100.