A Brief Guide to Graphite Sealing Gaskets

 **Author:Orginal from Internet

Graphite sealing gasket have a wide range of applications. They primarily utilise graphite’s high-temperature resistance and elasticity, enabling them to provide a seal in high-temperature environments without melting. What precautions should we take when using them?

Replace graphite gaskets regularly

Why should graphite gaskets be replaced? Failure to replace graphite gaskets regularly may result in the following problems:

1. Oxygen permeating the system, leading to increased background noise

2. Oxygen catalysing column loss

3. Sample degradation

4. Sample loss

5. Increased signal-to-noise ratio in the detector

6. Poor retention time repeatability

How can problems with graphite sealing rings be avoided?

1. To avoid problems with graphite seals, do not overtighten them; first tighten the column cap by hand, then use a spanner to secure it

2. Maintain cleanliness

3. Dry the seal thoroughly before use

4. Prevent contamination, such as fingerprints or oil

5. Replace the seal when changing the chromatographic column or components of the injector or detector