Evaluating the Thermal Stability of PTFE Septa for High-Temperature Analytical Techniques

Mar 26, 2021 · In this study, the thermal behavior of a series of leishmanicidal selenocyanate and diselenide biological active compounds has been studied by means of differential scanning calorimetry, X-ray diffraction and thermogravimetry in order to establish thermal stability criteria and investigate their polymorphism. Moreover, stability under acid, alkaline and oxidative media was tested using high

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through the center for easier needle penetration and to release the vacuum that forms when a large volume of sample is withdrawn from a vial.

Hamilton. High Temperature Septa is made of preconditioned PTFE/silicone rubber and is 3.175 mm (0.125 in.) thick. The average life of these septa is up to 100 injections with a 26s gauge needle. The maximum operating temperature is 212° C. Preconditioned PTFE/silicone rubber septa, 3.175 mm. Compare this item.

Jul 1, 2017 · the success o f a conventional high-temperature splitless . With regard to the analytical techniques for the determination of preservatives [9], reversed-phase liquid chromatography (LC ...

The stability of PTFE in air is comparable with that in an inert atmosphere, but the mode of breakdown is completely different. Monomer is almost entirely absent. The major product below 650 °C is the highly toxic carbonyl fluoride (COF 2); above this temperature the product decomposes to CO 2 and CF 4.

Sep 13, 2022 · Parameter T0.01/10h, the temperature at which 1% mass loss occurs in 10 h, was used to evaluate the long-term thermal stability of ILs. The thermal stability of the ILs was classified to five

The thermal stability of nanocomposites is an important parameter in various applications. Fig. 6(a) shows the TGA curves of PTFE nanocomposites, which could be used to evaluate the thermal stability. It can be found that the pure PTFE and the five GNP–PTFE nanocomposites all show a typical one-step decomposition behavior between 500 °C to

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. PTFE provides increased chemical resistance.

This chemical resistance makes PTFE septa suitable for use in various analytical and sample preparation techniques, such as gas chromatography (GC) and high-performance liquid chromatography (HPLC

Aug 28, 2022 · Figure 2.8.2 Simplified representation of the DTA for an exotherm and an endotherm. When the sample melts, the DTA dips which signifies an endotherm. When the sample is melting it requires energy from the system. Therefore the temperature of the sample pan decreases compared with the temperature of the reference pan.

Jan 16, 2021 · Techniques for evaluating the thermal oxidative stability. Before the decomposition or combustion process, the jet fuel must be thermally and oxidatively stable. Current tests for evaluating jet fuel thermal oxidative stability can be categorized as fuel oxidation-based and fuel deposition-based techniques. 3.1. Techniques for fuel oxidation

In the quasi-static thermal analysis method, a substance is heated at known intervals of temperature for a few hours and a particular property is measured. In the dynamic method, such as DTA or TG, the property of a material is followed by continuous heating at a uniform rate. In DTA the difference in temperature, Δ T, between the sample and a

PTFE/Red Rubber Septa offer good solvent resistance, good resealing characteristics and resistant to coring. They are an economical choice where a PTFE barrier is desired. The recommended operating temperature range for this septum is –40 to 100°C PTFE White Silicone PurePakTM Septa: (C4020-32) PurePak PTFE/Silicone septa are an excellent

Jun 7, 2016 · From the TG analysis, the thermal stability of MPPS/PTFE sewing thread was worse than that of PTFE sewing thread, but better than that of MPPS sewing thread, in which the initial thermal

5.4 Poly [2,2’- (m-phenylene)-5,5’-bibenzimidazole] (PBI) PBI is a thermally stable polymer synthesized from tetra-aminobiphenyl- (3,3’-diaminobenzidine) and diphenyl isophthalate. It is used in different forms, such as fibers, composites, and neat resin, primarily for high-temperature applications, but it has application in other fields.