Pre-slit PTFE/Silicone Septa
    • ptfe/silicone septa
    • vial septum for hplc
    • preslit septum
    • ptfe silicone septum
    ptfe/silicone septa

    Pre-slit PTFE/Silicone Septa

    Pre-slit PTFE / Silicone Septum
    In order to pierce easily
    Diameter: 8mm to 22mm
    Thickness: 1mm, 1.5mm, 3mm
    Septa Material: PTFE / Silicone
    Septa Feature: Pre-slit I or X
    Packing: 100pcs/pack, Inner PE bag; Standard Carton o
    product description


    Chromatography septas can be pre-slit. A pre-slit septum is an ideal choice in applications requiring 20% or more of the sample injection each time from the vial so that suction is avoided.

    The slit allows ambient gas to equalize the gas in the vial so that a vacuum is not created in the vial from the tight seal around the needle. If coring or clogging from a narrow needle or needle deflection from highly durable septa material is a concern, then choosing a pre-slit septum is a better choice.

    A PTFE/Silicone with slitted septum allows for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial. This septum provides chromatographic characteristics similar to that of a septum without a slit except that the ability to withstand exposure to aggressive solvents is slightly lessened. Pre-slit septa are highly recommended improving injection to injection reproducibility with autosamplers withdrawing greater than 50µL of sample from a 2mL vial, due to possible cavitation (vacuum).

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