Negative pressure inside 2mL HPLC vials during large volume injection leads to inaccurate sampling and poor reproducibility. This article explains the physicochemical mechanisms and provides practical solutions including pre-slit septa selection, torque optimization, and temperature equilibration strategies.

Ghost peaks in GC analysis often trace back to septum bleed and adhesive outgassing from vial closures. This guide explains how silicone oligomers and bonding agents release volatile compounds at high inlet temperatures, how to distinguish septum bleed from column bleed, and practical strategies to eliminate these contamination sources in trace-level analysis.

Septa coring generates particulates that clog injection ports and compromise chromatography data. Learn how needle selection, septum material choice, and proper installation prevent coring in HPLC and GC autosamplers.

In modern analytical laboratories running high-throughput gas chromatography GC and liquid chromatography LC workflows, sample vials represent one of the most frequently replaced consumable items. Whi

For laboratories running high-throughput chromatographic analysis, the septum is far more than a passive barrier. It is a precision-engineered component that directly affects autosampler performance,

Sample storage represents a distinct challenge from routine chromatographic analysis. While autosampler vials are designed for short-term containment and repeated needle access, storage vials must mai…

Septa | VWR Septa. Septa are available in a variety of materials and thicknesses. PTFE Natural 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. PTFE/High Performance Rubber is a highly pure synthetic red rubber septum Septa Selection Tool | Thermo Fisher Scientific – IN A specially moulded seal with a PTFE insert. Sealing surface of Butyl and PTFE...

What is the basic principle for choosing solvents for GC-MS The Gas Chromatography/Mass Spectrometry (GC/MS) instrument separates chemical mixtures (the GC component) and identifies the components at a molecular level (the MS component). How Pierced PTFE/Silicone Septa Affect GC-MS Experiments 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 sy...

Shop PTFE / Silicone Septum | 100/pk | wat058874 | Waters Our septa are held to a high standard of cleanliness and dimensional tolerances, as we believe you should only receive the cleanest products from us right out of the box. Tell your lab manager that you need this 100-pack of PTFE/Silicone Septa the next time they place an order at Waters, or simply order your own 100-pack yourself and have it EXCELLENT – HM0722 – High quality manufacturing ptfe septa EXCELLENT – HM0...

Caps & Closures | DWK Life Sciences Choosing the right septa and closures for your analysis is critical to ensure chemical compatibility with your sample and solvents and protect sample integrity and prevent contamination. Screw and snap caps are usually made of plastic, mostly polypropylene (PP) or polyethylene (PE), whereas seals for crimp-top vials are made from aluminum. Analytical Vials – MilliporeSigma Certified Vial Kit, Low Adsorption (LA), 2 mL, pk of 100, volume 2 mL, cl...