Description générale. 304 SS needle with chrome-plated brass Luer hub. Needle is designed with a slightly curved, deflecting tip to prevent coring during needle insertion through the septum. Standard Hub with 304 Stainless Steel Tubing.
A needle has a fairly fine bore, and can easily be blocked. The blockage normally comes from a piece of rubber septum which has broken off as the needle passes through. This is known as coring. There are two things which can be done to prevent or minimise this. The first is to use a PTFE septum.
Buy Kinesis PTFE/Silicone/PTFE Septum, 9 mm; 1000/pk and more from our comprehensive selection of Kinesis® Septa for Vials from Cole-Parmer
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Replacement septa for use with MW-102 open-top screw caps on Minum-Ware® glassware components. Septa are made of silicone rubber with one side having a RED PTFE face, while the opposite side has an ultrathin covering of polypropylene to prevent needle coring when penetrating septa, except for the 20mm size which has red PTFE on both sides
Jun 13, 2022 · Furthermore, a layer of PTFE is laminated to each side of high purity, medium durometer silicone to form a septum that is the most resistant to coring. All the while, it maintains good resealing characteristics. PTFE/Silicone/PTFE septa provide superior performance with any autosampler, especially if a needle has a large diameter and blunt tip.
Kinesis – Item # EW-98706-20. Choose the right septum for optimal performance and results. Various materials, thicknesses and hardnessess to suit your application. Pre-slit septa prevent a vacuum forming inside the vial. White silicone/blue PTFE with cross slit, 22 mm dia. MORE +.
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For manual GC injections, a beveled tip, like style 2 is preferred for optimum septum penetration and to prevent septum coring. Also, Hamilton point style AS and SGE cone-tip needles are specially designed for this application. When using an autosampler, consult the instrument manual for the preferred point style.
Mar 22, 2020 · For sensitive analyses only high purity Silicone / PTFE closures can be used; if additionally there is a need for minimal coring during penetration, a PTFE / Silicone / PTFE septum (sandwich septum) is recommendable. Cap colors may be used for marking (sample marking / lab marking / shift marking).
guides the needle for easy penetration and less coring. Long-Life Septa are the preferred septum for autosamplers and are ideal for overnight runs. You can make up to 400 injections per septum and its soft 45 Durometer rating is easy on autosampler needles.
This snap neck cap is paired with a Preslit PTFE/Silicone septum, made to provide adequate venting and prevent vacuum formation in the sample vial. This creates superior sample-draw reproducibility and eliminates coring from bottom draw-port needles. Laboratories can also benefit from the good resealing ability, making these septa recommended
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Sep 20, 2017 · Figure 1: Typical septum bleed profiles from splitless and split injections. Septa ‘core’ or split through prolonged use, if the incorrect syringe point style is used or if the septum nut, which holds it in place, is over tightened, is badly fitting or if the septum is the incorrect size. Figure 2: Coring of septa following repeated injections
Silicone is fine for aqueous samples, but rubber is most commonly used. It reseals, but can leave a slug of rubber in the needle (known as coring). If this happens it can sometimes be cleared, but spoils the run. To prevent this, use a septum with a layer of PTFE on top.