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Inlet Liners

Confidence in your Analysis

The purpose of an inlet liner in a GC system is to allow a sample injected in the liquid phase to pass into the gaseous phase and onto the GC column. The elevated temperature used in the GC inlet vaporizes the liquid sample into a gaseous sample for transfer to the GC column. During the transition from a liquid to a gas, there is change in the volume and the liner must be able to contain this volume. If the volume is too large, sample is lost, impacting reproducibility and sensitivity.

Important considerations when selecting inlet liners:

Must not react with the sample.
The liner volume must be larger than the volume of vaporized sample.
The liner should minimize discrimination not promote it.
Adding quartz wool increases the surface area and promotes mixing.
Inlet liners should be deactivated, especially for analysis of polar solutes and for splitless injections.
Wool should be placed in the optimum position.

Product Categories | Inlet Liners

Liner Selection Guide

Color	Injection technique	Sample type(s)	Liner geometry	How it works
Dark green	Splitless	Trace level analyses Active compounds	Taper/Gooseneck	A bottom taper focuses sample onto the head of the column and minimizes sample contact with metal parts of the inlet Remember – the addition of quartz wool to your inlet liner promotes mixing of analytes, aids the vaporization of liquid samples, and works as a trap to collect non-volatile residue in the sample (i.e. protects capillary column from ‘dirty’ samples).
Blue	Split	General purpose Concentrated samples Dirty samples	FocusLiner	Ensures quartz wool remains in the correct position in the liner Excellent reproducibility results from the wiping of the sample from the syringe needle and the prevention of droplet formation Minimizes high molecular weight discrimination.
Aqua	Splitless	Trace level analyses Dirty samples Wide boiling point range	Tapered FocusLiner	Bottom taper focuses sample onto the head of the column and minimizes contact with metal parts of the inlet Ensures quartz wool remains in the correct position in the liner Excellent reproducibility results from the wiping of the sample from the syringe needle and the prevention of droplet formation
Orange	Direct	Trace level analyses Active compounds	ConnecTite	ConnecTite liners facilitate maximum transfer of sample to the GC column and inhibit sample degradation due to hot metal components inside the inlet Systems equipped with electronic pressure control require a hole in the liner body to maintain system gas flows ConnecTite liners that have a hole near the bottom are best suited to analyses where a tailing solvent peak could affect early eluting compounds. ConnecTite liners with a hole at the top of the liner will improve your analysis with aqueous injections or where compounds of interest elute away from the solvent peak
Purple	Split/Splitless	General purpose Concentrated samples Dirty samples (only if quartz wool is present) Gaseous samples (also purge and trap, headspace)	Straight	Straight liners facilitate higher split flows Narrow bore straight liners facilitate fast GC work Small injection volumes of less than 0.5 μL are best used with a narrow bore Narrow bore straight liners improve focusing of gaseous samples (purge, trap and headspace)
Yellow	Splitless LVI	Trace level analyses Low BP compounds Active compounds	Double Taper	Bottom taper minimizes contact with metal parts of the inlet and focuses sample onto the head of the column Top taper aids in minimizing sample flashback
Gray	PTV LVI	Trace level analyses Large volume injections	PTV/LVI	PTV and LVI liners generally have sintered glass beads or powder to increase the surface area and trap nonvolatile residue Side hole needles are recommended for these techniques to ensure effective distribution of sample within the liner PTV liners use baffles or a wisp of quartz wool to aid in vaporization of samples and retain droplets during low temperature injections