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

Technical Support Customer Service. Replace your worn out septa with Aijiren Tech™ SureSTART™ 20 mm Septa (Level 2). Select Level 2 products for high throughput applications, when robustness and reproducibility are key. Choose from various pack sizes of silicone/PTFE or butyl/PTFE septa manufactured with shore values of 45 and 50

PTFE / Silicone septa (T/S) are the most useful for HPLC applications as they have wide chemical compatibility and low extractables (I recommend them for general purpose use) . These area

Mar 31, 2022 · PTFE/silicone septa. PTFE/Silicone is an ideal choice for analyzing volatile organic chemicals. These analyses happen at low concentrations or during operation at higher conditioning temperatures. Store PTFE/Silicone septa in a glass Purepak jar to ensure: 1. minimal background, 2. low permeability, 3. and the best performance of any headspace

Septa, PTFE/Silicone, tan PTFE/silicone septum, septum diam. × total thickness × PTFE thickness 18 mm × 0.060 in. × 2 mil, pkg of 144 ea Expand View Pricing

Science. Chemistry. Chemistry questions and answers. 1. Why are THC/CBD ratios in potency testing much more difficult to achieve using direct MS analysis rather than LC-MS or GC-MS? 2. How did Hajslova et. al. more effectively measure Δ9-THC and other trace cannabinoids by LC-MS in a CBD oil sample that contained a very large CBD peak? 3.

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

selecting septa. PTFE/red rubber septa are not recommended for multiple injections or for samples that need to be stored for further analysis. When applications require a longer time between injections or any type of standard additions, PTFE/silicone septa are always best. What force is required to penetrate the septum?

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.

Our closures with septa are made in a wide variety of sizes and materials ensuring you have the right combination for your sample type and analysis temperature. Each product is manufactured using strict quality control standards resulting in consistent cap dimensions with septa which may be certified for higher purity grades.

For use with 13-425 threaded caps or 13mm Snap/Crimp Caps, Aijiren Tech™ 13mm Septa are available in PTFE/ Red Rubber, PTFE/Silicone or Red PTFE/White Silicone/Red PTFE to suit a variety of applications. PTFE disk septa are chemically inert. PFTE/red rubber septa are economical for many GC applications.

VanGuard Pre-Columns are uniquely designed to protect and prolong ACQUITY UPLC column performance while contributing minimal chromatographic effects. `. Discover Aijiren Technology Chromatography Column Particle Technologies, including Ethylene-Bridged Hybrid (BEH), Charged-Surface Hybrid (CSH), and High-Strength Silica (HSS) column options.

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 most HPLC and GC applications where resealability and purity are critical. Pre-slit PTFE

Search for Certificate of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.