Both types of silicone and butyl rubber septa have a PTFE barrier layer which faces the sample, which reduces the contact between the sample and the silicone and butyl rubber. Before the PTFE layer is punctured, the chemical compatibility properties of the PTFE will determine the solvent compatibility.
and good chemical compatibility, effective sealing/resealing and low penetration force make PTFE/silicone septa suitable for all types of chromatographic applications . A thin film of PTFE is laminated to the side of the septum that faces the sample to limit exposure of the elastomer to the solvent . PTFE/Silicone septa are ideal for use in
PTFE/Silicone vial septa are available with a slit which provides a secure seal and also allows for easy penetration of the autosampler needle. For use with most organic solvents. Even though the PTFE is pierced, septa will still have the silicone compatibility.
*PTFE/silicone/ PTFE has the same chemical compatibility of PTFE only until punctured. “C” indicates that the septa from this category are compatible with the solvent in most configurations. Pre-slit or Not, Which One to Choose? Chromatography septas can be pre-slit or not and must be considered by evaluating a few factors.
Chemical Compatibility Reference Chart Teflon® PTFE Teflon®* PTFE Chemical Compatibility Chart: Check the chemical compatibility of Teflon® and PTFE with various chemicals, solvents, alcohols and other products. Polytetrafluoroethylene (PTFE) is very non-reactive and is often used in containers holding reactive and corrosive chemicals.
Mar 31, 2022 · PTFE/rubber septa. PTFE/Red Rubber Septa have: 1. strong solvent resistance, 2. resealing properties, 3. and are coring resistant. When you need a PTFE barrier, they are the most cost-effective option. Until the initial puncture, the PTFE face increases solvent compatibility. Temperature stability chart for PTFE/rubber septa:
Sep 26, 2023 · A: According to the material, septa can be roughly divided into three categories: PTFE, PTFE+silica gel, and pre-cut PTFE+silica gel. Different experiments require different types of septa.
PTFE - polytetrafluoroethylene SBR - styrene butadiene rubber TPE - thermoplastic Elastomer, C-Flex Although the information in this chart was acquired from reputable sources, it should only be used as a guide in selecting a container and closure system. Because so many factors can affect the chemical resistance of a material, in-house
Chemical compatibility can vary depending on the concentration of the solvent, temperature,
Unlined Caps: Unlined polypropylene closures are available in white or black. These caps are autoclavable and are suitable for many dry products. Teflon PTFE/Silicone Septa: The Teflon® PTFE/Silicone septa resists coring and is recommended when multiple injections are required. This .125" septa has excellent resealing qualities.
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.
Nov 5, 2018 · A: Evaporation of both solvent and analytes can occur over time, even with re-sealing septa like PTFE/Silicon. It is very much dependent on the chemistry of the analytes, the diluent, and the
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.
Gray PTFE/red rubber septa Good solvent resistance, good resealing characteristics, resistant
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