Apparently the silicone septum doesn't withstand organic solvents very well, so better prepare a new blank for each sequence. The attached image shows the old blank (black) compared to a fresh one
PTFE/Silicone septum is provided with a thin 0.005” PTFE layer laminated to our high purity silicone and slit through the center to provide for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial.
I-Chem. Clear borosilicate glass with 0.060 in. Thin Septa 40 mL clear septa vials feature a thin (0.060”) PTFE/silicone septa. The septum is easy to puncture with syringe needles and is ultrasonically bonded to the 24-414 polypropylene closure. No adhesive is used. I-CHEM Certified®.
The septum you choose for your autosampler vial can impact sample evaporation, sample security, needle bending and blockages, and instrument down time. Don’t let the complexities of septa selection slow you down. Use the simple online Aijiren Tech SureSTART Selection Guide to find the right septa and vial for your analysis.
Green, pre-slit PTFE/silicone septa 100/pk 5183-2077 Red, pre-slit PTFE/silicone septa 100/pk 5183-2078 Polypropylene Screw Caps with Bonded Septa Blue polypropylene cap, bonded PTFE/silicone septa 100/pk 5185-5823 Blue polypropylene cap, bonded pre-slit PTFE/silicone septa 100/pk 5185-5824 Polypropylene Screw Caps (no septa)
Jun 9, 2022 · Coring, whether from the sample vial or the injection port septum, will result in an increased number of siloxanes that will manifest themselves as “ghost peaks” (5). Whether it is valve bleed, septum vial bleed, or GC inlet septum bleed, there will be late eluting compounds, with m/z 73 for many of them. Identifying the source of siloxanes
Apr 21, 2021 · The working procedure for liquid sample preparation is as follows: Put a 150 mL glass beaker on the balance. Draw up the liquid sample into the syringe. Put the needle protector on again. Place the syringe with the needle up into the beaker glass. Tare the weighing-balance.
Jan 2, 2006 · Figure 3 - Typical mass chromatogram of volatile residue in hexane caused by PTFE/silicone septa: a) hexane extract of a piece of septum; b) vial septum was punctured once by a syringe to sample 1 μL hexane for GC analysis; c) hexane in the last vial was reanalyzed after 3 days; and d) analyzed immediately after 100 μL hexane was added from one vial to another (the septum was punctured 10
The open top cap with the silicone septa is a moving closure system. The septum rises and lowers with temperature change that produces a water volume change. This up and down motion stresses the seal created by silicone rubber, allowing air bubbles to develop if there is insufficient compression of the septum onto the top of the glass vial.
PTFE/silicone/PTFE – TST1, TST11. A layer of PTFE on each side of medium hardness silicone. Most resistant to coring with above average resealing characteristics. Recommended for most demanding applications such as trace analysis, longer time between injections, or for internal standards.
silicone/ PTFE Thin, fragile needle? Soft and thin septa required e.g. silicone/ PTFE Blunt, thick needle? Slit/pre- cut liner as penetration aid (HPLC) silicone/ PTFE, slit Critical analysis? Very clean liner required
Assembled screw cap with hole with PTFE/silicone septum, black polypropylene hole cap, thread for 15-425, PTFE/silicone, septum thickness 1.5 mm, for use with 7 mL vial, pkg of 100 ea composite dimension.default
Catalog number: S320-0060. Apply EPA Volatile Organic Analysis (VOA) soil methods when using Aijiren Tech™ Wide-Mouth Septa Jars. Available as clear or amber Type III soda-lime glass, jars are recommended for EPA Volatile Organic Analysis (VOA) soil methods. Open-top cap is equipped with a pierceable PTFE-faced silicone septum.
The septum is provided with a thin 0.005” PTFE layer laminated to highly pure silicone, and slit through the center for easier needle penetration and to release the vacuum that forms when a large volume of sample is withdrawn from a vial.
.jpg)