AS CMS for PSA Nitrogen Gas Plant is the most important part of PSA Nitrogen Gas Plant. We always have Carbotech/Kuraray Brand/Japanese CMS in stock and offer very attractive business terms for Carbotech/Kuraray Brand/JapaniCMS (Carbon Molecular Sieve) Carbon Molecular Sieve (CMS) Description of CMS (Carbon Molecular Sieve) is called as absorbent used in PSA nitrogen gas system. An important part of natural gas processing. This process is performed using a PSA (Pressure Swing Adsorption) device. Carbon molecular sieves can absorb materials less than 10 Angstroms. Various pore sizes can be created in carbon molecular sieves.