Aijiren 20ml ND18 Clear Screw Headspace Gc Glass Vial for Chromatography Analysis. Min. Order: 1000 Pieces. Disposable: Disposable. Certification: ISO, RoHS. Material: Glass. Bottle Top: Screw Top. Capacity: 20ml. Vial Material: USP Type 1, Borosilicate Glass. Suppliers with verified business licenses.