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The Importance of Silicone Septa Design for Easy and Reliable Needle Penetration in Solid Phase Extraction
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Products. Septa. By definition, a rubber septum consists of a disk of rubber or similar material used to seal a vial or other device. It is installed along the inside of a cap, which is typically made of metal or plastic. A syringe needle pierces the rubber septum for the purpose of injection and, on withdrawal, the elasticity of the septum
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Thermogreen ® LB-2 Septa is suitable for the following applications: To minimize extraction onto or loss of analytes off the Solid phase microextraction (SPME) fiber from the vial during analysis by GC-MS. Thermo-resistant septa is used in GC instrument to avoid carrier gas leaks, extraneous peaks and phthalate contamination.
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Works well for applications where ease of needle penetration is important. A PTFE/Silicone with slitted septum allows for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial. This septum provides
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When selecting which septa is right for your experiments, it is important to consider the: Instrument Each instrument vendor uses different injector needle types and for some instruments, having pre-slit septa, or choosing a material with a lower shore (hardness) value will help reduce the chances of needle issues, such as needle bending.
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phase surfaces and volumes, and an arrow-shaped tip, which allows for smoother penetration of vial and injector septa. SPME fiber advantages: – Original proven design – Solvent-free – Easy to automate – Nondestructive to samples – Fibers are reusable – Compatible with GC or HPLC instrumentation
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The low durometer of red rubber allows for easy needle penetration even with thin bore GC needles. PTFE/Red rubber septa are not recommended for multiple injections with long run times or retention of samples for further analysis after initial puncture. PTFE/silicone septa: (T/S) PTFE/Silicone is the most versatile septum material offered in
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Sep 8, 2022 · Silicone Rubber Septa. High-quality, silicone rubber laminated to PTFE. Use when excellent resealing qualities are a must. Septum resists coring and is recommended when multiple injections are
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Generally, silicone septa are more easily pierced than red rubber or butyl septa. For thicker, hard-to-pierce septa, a small gauge (23 gauge) needle may be required, or a stronger S-needle can be used. Preslit septa are the best option for easy penetration, reducing the likelihood of coring.
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Optimization of SPME Extraction Conditions GC Injector Setup To reduce inlet septa coring, we strongly recommend using molded Thermogreen® LB-2 septa with injection hole. Also, make sure that the injection port contains an appropriate liner. The use of a liner designed specifically for SPME with a narrow I.D. (0.75 mm - 1.0
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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.
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Aijiren Guide to SPME Analysis is a comprehensive webinar that covers the basics and applications of solid phase microextraction (SPME), a solvent-free sample preparation technique. Learn how to choose the right SPME fiber or Arrow, optimize the extraction conditions, and troubleshoot common issues. Register now to access the webinar recording and slides.
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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
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J.G. Finneran. The Finneran 24 mm septa is mainly used with screw thread closures for tight sealing of the stored sample. It is mainly used in research laboratories or in chemical industries. This septa is made of sturdy PTFE/silicone material which ensures long lasting usage and durability. Compare this item.
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Wheaton headspace vials accept 20 mm aluminum seals Rounded shoulders and bottoms, allowing for even heating and safer operation at higher pressures Manufactured from Type I borosilicate glass Top provides a tighter seal with your septa O.D. x Height: 23 x 75 mm Capacity: 20 mL. Related Products: 20 Ml Glass Vials. Compare this item.
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Jun 12, 2023 · They provide enhanced resealing properties due to the pre-slit design, which helps minimize coring and maintain a reliable seal after needle penetration. Additionally, they are chemically inert, have low levels of extractables, and can withstand a wide range of temperatures and pressures commonly encountered in analytical applications.
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