Wool plugs are often used in GC inlet liners to improve sample vaporization, and/or to keep non-volatile material from entering the column. They can also be used in packed GC columns, solvent desorption tubes, thermal desorption tubes, and purge traps to retain packed beds.

Silanised: For general purpose use

Pesticide Grade (Silanised): For applications that involve active analytes, such as organochlorine and/or organophosphorous pesticides.

Phosphoric acid treated: For acidic compounds such as barbiturates, free fatty acids, etc.

Non-treated: For special application where the user deactivates based on their intended analytes