The experience of GC column configuration is very common. The friend who uses the gas chromatograph for the first time does not know how to configure the column properly. He always hopes that the more columns, the better. He blindly purchases many columns or fixatives, supports, etc., resulting in many idle results. waste. The experts hereby recommend some worthwhile experiences for everyone.

The length of the column: because the resolution is proportional to the square root of the column length. Longer columns increase resolution. In general: 15m short columns are used for rapid separation of simpler samples, but also for rapid component analysis; 30m columns are the most commonly used column lengths; most analyses are performed on columns of this length; 50m, 60m Or longer columns are used to separate more complex samples.

For the choice of caliber: The diameter of the column directly affects the column's efficiency, retention characteristics, and sample size. Small-caliber columns have higher efficiency than large-caliber columns, but the column capacity is smaller.

0.25mm: High column efficiency, low column capacity. It is better to separate complex samples.

0.32mm: The column efficiency is slightly lower than the 0.25mm column, but the column capacity is about 60% higher.

0.53mm: With column capacity similar to packed column, it can be used for split injection or splitless injection. When column capacity is the main consideration (such as trace analysis), it is more suitable to choose large-caliber capillary column. Experts believe that for the average user, a capillary of 30 meters or 50 meters in length can be selected, and the diameter of 0.32 mm is more convenient.

Chemical resistant PTFE Bellows

PTFE film is made by extruding and stretching the material into thin sheets. The result is a highly flexible and durable material that can be used in a variety of applications. The film is available in a range of thicknesses, from a few microns to several millimeters, depending on the intended use.
One of the key properties of PTFE film is its chemical resistance. It is highly resistant to a wide range of chemicals, including acids, bases, and solvents. This makes it an ideal choice for use in applications where exposure to harsh chemicals is likely. PTFE film is also resistant to UV radiation, which makes it suitable for outdoor use.
Another important property of PTFE film is its high temperature resistance. It can withstand temperatures up to 260°C, making it suitable for use in high-temperature applications. PTFE film is also non-stick, which makes it ideal for use in applications where sticking or adhesion is a problem.
PTFE film is used in a wide range of applications, including as a release film in the manufacturing of composite materials, as a barrier film in the packaging of food and pharmaceuticals, and as a protective film in the electronics industry. It is also used in the production of gaskets, seals, and bearings, where its chemical resistance and high temperature resistance make it an ideal choice.



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July 11, 2024