PTFE Chemical Compatibility Chart: Polytetrafluoroethylene is very non-reactive and ideal for use with most chemicals. Review the chemical compatibility of Teflon® and PTFE with various chemicals, solvents, alcohols and other products in the cart below.
Red Rubber / PTFE: PTFE resistance until punctured, then septa or liner will have compatibility of red rubber: 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
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.
Excellent solvent resistance and chemical compatibility Does not reseal upon puncturing Not recommended for long-term sample storage PTFE/Silicone Recommended for multiple injections and sample storage Demonstrates excellent resealing characteristics PTFE chemical resistance until punctured, then the septum will
Polyethylene (LDPE and HDPE) Resistance Chart by Chemical. The chemical compatibility of LDPE and HDPE on this chart is tested at 20°C: and 50°C: for 7 days and 30 days (if applicable) with constant exposure. LDPE & HDPE resistance listed by chemical. 1.4-dioxane. LDPE / HDPE at 20°C: little or no damage after 30 days.
the solvent. PTFE/Silicone septa are ideal for use in most HPLC and GC applications where resealability and purity are critical. Pre-slit PTFE/silicone septa Pre-slit septa are offered in many of the same formulations as for non-slit PTFE/silicone septa and shares most of the physical and chemical characteristics.
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,
Table 2. Cap and septum chemical compatibility. High performance septa Thin PTFE PTFE/Silicone* PTFE/Silicone/PTFE* PTFE/Red rubber Flouroelastomer Butyl Temperature range 40 °C to 300 °C** Up to 260 °C –40 °C to 200 °C –40 °C to 200 °C –40 °C to 90 °C –40 °C to 260 °C –50 °C to 150 °C Use for multiple injections
Chemical compatibility can vary depending on the concentration of the solvent, temperature, molecular weight of the solvent, and other factors. It is always recommended to try a variety of septa to determine the best one for analysis. *PTFE/silicone/ PTFE has the same chemical compatibility of PTFE ONLY UNTIL PUNCTURED.
manufacturer lots of septa were tested for lot-to-lot consistency. In addition, PTFE/silicone HS septa from 3 vendors were tested for comparison under the same conditions as the High Performance septa. Chemical solvents and reagents All reagents and solvents were HPLC or analytical grade. Milli-Q water was used. Dimethyl sulfoxide,
Oct 21, 2022 · PTFE. PTFE septa provide excellent resistance to solvents and are easy to penetrate. However, PTFE septa are not resealable and are recommended only for short-term storage and single-injection use. Pre-slit PTFE/silicone. Pre-slit septa feature a slit in the center, allowing easier penetration and sample removal. This type of septum is similar
Septum Selection Guide Septum Selection Guide Septa for use with general chromatography vials PTFE/Red Rubber Septa: (PTFE/RR) PTFE/Red Rubber septa are the most popular and economical choice for general gas chromatography applications. These septa are used primarily for routine analysis in gas chromatography with FID, TCD and FPD detectors.
Gray PTFE/red rubber septa Good solvent resistance, good resealing characteristics, resistant to coring. An economical choice where a PTFE barrier is desired. PTFE facing improves solvent compatibility until initial puncture. PTFE/white silicone purepack septa Excellent choice for general volatiles analysis.
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.
Extractables from PTFE/Silicone septa are generally at lower levels compared to other resealable materials. PTFE/Silicone septa are formulated for different hardness (durometer) meeting requirements of various needle types. Formulations offering highly consistent performance, lowest background/blank value, and good chemical compatibility, effective
