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1.5ml 8mm 8-425 Vial Caps with Septa HPLC Gc Vial Caps Sc8181. High Chemical Resistance: 8mm PTFE/silicone septa offer excellent inertness and acid/alkali resistance. Autosampler Compatible: 8mm screw vials fit all common autosamplers with standard narrow neck design. Certified Quality: Products hold CE and ISO certifications for reliable performance. Flexible Customization: Supports full, minor, and flexible customization from samples or designs. Versatile Cap Options: Available in black or white screw caps with closed top or center hole. Premium Glass Material: Manufactured from clear or amber borosilicate glass for durability.