Mar 31, 2022 · PTFE disk septa. A solid disk 0.010″ thick, our PTFE stands better than the most aggressive solvents. At least when it comes to chemical inertness. Most standard gauge metal HPLC needles can penetrate the thin membrane. Do not use PTFE septa with the following because you can’t release PTFE septa: 1. volatile solvents, 2. fast cycle periods,
A specially moulded seal with a PTFE insert. Sealing surface of Butyl and PTFE affects a more positive seal than non-PTFE-faced septa. Ideal choice for temperatures below 125°C. Good sealing characteristics, excellent resistance to most solvents with reduced coring and high puncture tolerance. PTFE provides increased chemical resistance.
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PTFE Septa A solid disk of 0.010” thick PTFE offers superior chemical inertness against the most aggressive solvents. The thin membrane allows for easy penetration by most needles. PTFE septa are not resealable. They should be used with relatively short cycle times or single injection methods.
Polytetrafluoroethylene ( PTFE) is a synthetic fluoropolymer of tetrafluoroethylene and is a PFAS that has numerous applications. The commonly known brand name of PTFE-based composition is Teflon by Chemours, [3] a spin-off from DuPont, which originally discovered the compound in 1938. [3]
Nov 5, 2018 · Both PTFE and polyethylene have excellent chemical resistance to THF, but silicone has poor chemical resistance to THF. For an ELSD, RI or MS detector, PTFE or PE septa would be the recommendation.
PTFE/Silicone septa offer exceptional chemical resistance, minimizing contamination risks and preserving sample integrity across a wide range of aggressive chemicals. Excellent Temperature Stability: These septa maintain their integrity in extreme temperatures, displaying minimal shrinkage or expansion.
PTFE disk septa A solid disk of 0.010” thick pure PTFE offers superior chemical inertness against the most aggressive solvents. The thin membrane allows for penetration by most normal gauge metal HPLC needles. PTFE septa are not resealable and should not be used with highly volatile solvents, short cycle times or multiple injection methods.
Medical/Pharmaceutical. TCI manufactures cast PTFE, ETFE, and FEP foils/films for use as vial cap liners, septa and stopper applications, sampling bags, flexible culture bags, blood storage bags, 2-D fluid bags, and storage or transportation containers for the pharmaceutical industry. Our high-performance fluoropolymer films are chemically
These septa provide adequate venting in order to prevent vacuum formation in the sample vial, which allows for superior sample draw reproducibility across vials. Pre-slit PTFE/Silicone septa have a working temperature range from -40 degrees C to 200 degrees C. The chemical compatibility of the septum is that of silicone, but it does not have
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Rubber septa. Used primarily for routine analysis in gas chromatography. Offers moderate ability to reseal and good chemical inertness. Not recommended for multiple injections or holding samples for further analysis. PTFE is protective layer that once broken exposes rubber to chemical attack.
a barrier (usually PTFE) and one to allow for resealing (usually silicone) • 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
The septa are conditioned to provide the lowest level of chromatographic extractables. Choose these products for ultimate method performance and high levels of and sample security and integrity. All SureSTART vials, closures, and septa are certified to meet physical parameter specifications as part of our manufacturing process.
PTFE does not reseal after being punctured: Silicone: Alcohol, DMF, DMSO, hydrogen peroxide, sodium hydroxide: ACN, benzene, chloroform, hexane, HCL, MEK, THF, toluene: Silicone / PTFE: PTFE chemical resistance until punctured, then septa or liner will have compatibility of silicone: PTFE does not reseal after being punctured: Viton®
Laminated septa will generally exhibit greater chemical resistance until the PTFE layer is punctured. Other factors that can affect chemical compatibility are temperature, pressure, whether there is direct contact between the material and the solvent and concentration of the solvent. Solvent mixtures can both increase and decrease chemical attack.
Technical Support Customer Service. Replace your worn out septa with Thermo Scientific™ SureSTART™ 20 mm Septa (Level 2). Select Level 2 products for high throughput applications, when robustness and reproducibility are key. Choose from various pack sizes of silicone/PTFE or butyl/PTFE septa manufactured with shore values of 45 and 50
