ND8 (8-425) Screw Neck Vials, Inserts and Screw Caps. Borosilicate glass - 1st hydrolytic class. Description. Part No. Price CHF / Qty. Certified Vials, Caps, Septa, and Inserts at Competitive Prices. advanced technology for HPLC, GC, Made with High Quality Glass as a crimp or screw thread seal, snap vials are only recommended for short.