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allows for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial.
Buy Kinesis PTFE/Silicone/PTFE Septum, 9 mm; 1000/pk and more from our comprehensive selection of Kinesis® Septa for Vials from Masterflex
Kinesis – Item # HV-98706-01. 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. Cream silicone/red PTFE, 13 mm dia. MORE +. $35.00 USD / Pkg of 100.
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 []
Find ptfe-faced silicone septum and related products for scientific research at MilliporeSigma
Buy Kinesis PTFE/Silicone/PTFE Septum, 8 mm; 1000/pk and more from our comprehensive selection of Kinesis® Septa for Vials from Masterflex
The preslit PTFE/Silicone septum is recommended for multiple injections with a working temperature range from -40 C to 200 C and eliminates coring from bottom draw-port needles. This septum also provides adequate venting to prevent vacuum formation in the sample vial and delivers excellent sample draw reproducibility.
Kinesis – Item # EW-98706-16. 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/beige PTFE, 20 mm dia. MORE +.
Septa, PTFE/Silicone, tan PTFE/silicone septum, septum diam. × total thickness × PTFE thickness 18 mm × 0.060 in. × 2 mil, pkg of 144 ea Expand View Pricing
When it’s time for sample injection, you can trust the PTFE/Silicone Septum from Waters to help you perform that process successfully. Our septa are held to a high standard of cleanliness and dimensional tolerances, as we believe you should only receive the cleanest products from us right out of the box. Tell your lab manager that you need
• Tri-layer (also known as a sandwich septum): Still made from two distinct materials – usually silicone surrounded on both sides by PTFE Table 1. Septa chemical compatibility. PTFE/Silicone/PTFE* PTFE/Red rubber Fluoroelas tomer PTFE/Butyl *PTFE/Silicone/PTFE has the same chemical compatibili ty of PTFE only until punctured.
23242-U: tan PTFE/silicone septum, septum diam. × total thickness × PTFE thickness 18 mm × 0.060 in. × 2 mil, pkg of 144 ea: Expand
Silicone-septum found in: 40ml vial, clear borosilicate glass, 24-414 red open top polypropylene cap with 0.125" PTFE /silicone septum - certified,..
PTFE/silicone – ST101, ST14 • A very pure soft silicone laminated to PTFE. Septum resists coring and is recommended for instruments with fine gauge needles • Also recommended for LC-MS and GC-MS due to high purity PTFE /silicone – ST143, ST144 A very soft silicone laminated to PTFE. Use with flexible needle PTFE /silicone/PTFE – TST1
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.