Home » News » Vials Septa » Customized chromatography vial septa Sigma Septa | Sigma-Aldrich Product Number Product Description SDS; 27350-U: black Viton ®, diam. × thickness 8 mm × 0.060 in., for use with 2 mL vial, standard opening, pkg of 100 ea: Pricing: 27351: black Viton ®, diam. × thickness 11 mm × 0.060 in., for use with 4 mL vial, pkg of 100 ea