PTFE/silicone septa for chromatography system vial compatibility

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.

HS blank chromatograms from PTFE/silicone headspace septa from several competitors with High Performance septa. As shown in the figure, the High Performance septa provided low HS chromatographic background at 300 °C. 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 Supplier 3 Thermaseal HS septa Claimed can be used up to 300 °C

Vials, open-top screw cap, 2 mL large opening with closures, unassembled convenience packs volume 2 mL, clear glass vial, thread for 10-425, black polypropylene cap, PTFE/silicone septa, pkg of × 100 ea; find Supelco-29118U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich

PTFE/Silicone. Advantages: Re-seals well. Chemical resistance: Not suitable for chlorosilanes. Maximum temperature: 200°C. Suitable for: Multiple injections. Pre-Slit PTFE/Silicone*. Advantages: Less coring; reduced vacuum inside vial. Chemical resistance: Moderate resistance following initial puncture. Maximum temperature: 200°C.

Septum Selection Guide Septa for use with general chromatography vials, liquid injection 2-056 PTFE/Natural Red Rubber PTFE Natural Red Rubber are moderately priced seals for GC and HPLC with good chemical properties. They are ideal for multiple injections due to high resealability, but not as easy to penetrate as PTFE/RR.

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. The septum is provided with a

18 mm PTFE/Butyl Assembled Caps/Septa 3.2 mm thickness 100 N9306076 18 mm PTFE/Silicone Assembled Caps/Septa 3.2 mm thickness 100 N9306077 18 mm Red PTFE/White Silicone Metal Screw Cap/Septa 100 N6356474 1.3 mm thickness 8 mm hole 18 mm White PTFE/Transparent Blue Silicone Metal Screw Cap/Septa 100 N6356475 1.3 mm thickness 8 mm hole

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.

Blue Screw Caps, PTFE/silicone/PTFE septa : 100/pk : 5182-0724: Green Screw Caps, PTFE/silicone/PTFE septa : 100/pk : 5182-0725: Red Screw Caps, PTFE/silicone/PTFE septa : 100/pk : : Blue Screw Caps, pre-slit PTFE/silicone septa : 100/pk : 5183-2077: Green Screw Caps, pre-slit PTFE/silicone septa : 100/pk : 5183-2078

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.

PTFE/Silicone Vial Kit, Snap, µVial i3 (Qsert), Clear w/ Patch + PTFE/Silicone, preSlit 100/pk AR0-9671-12 AR0-9672-12 1000/pk AR0-9671-13 AR0-9672-13 See page 32 for specialty vials product details. Snap-Top Snap-Top Vial Products Phenomenex l WEB: www.phenomenex.com

PTFE chemical resistance until punctured, then the septum will have the chemical compatibility of silicone Working temperature range from -40 ˚C to 200 ˚C Pre-slit PTFE/Silicone Provides adequate venting to prevent vacuum formation in sample vial, delivering excellent sample-draw reproducibility Eliminates coring from bottom draw needles

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

PTFE/Silicone Septa: (T/S) High quality, pure silicone is laminated to 0.005” thick PTFE to give a pure, highly inert septum with excellent resealing characteristics even after repeated punctures. PTFE/Silicone septa are the preferred product for use in most HPLC and GC applications where resealability and high purity are critical.