Description · Septa are pre-slit for special needles.· Stand 8-425 septa with slit to match with 8-425 screw thread pp cap for hplc.· Every shipment is with certificate of analysis.· 8mm septa with different thickness 1mm, 1.3mm and 1.5mm choice.· Caps and septa can be pre-assembled by automatic assembling equipment to minimize contamination from handling.