Online Calculators for Chromatographic Optimization

Backflash Calculator: Calculates vapor expansion based on injection parameters; allows selection of different solvents, liner dimensions, temperature, pressure, and sample volume.
Typical GC Column Characteristics: Look up approximate flow rates, sample capacity, ferrule dimensions, and other column characteristics based on ID.
Pressure Calculator: Converts between pressure measures, calculates values.

Setting Dead Time for Optimum Linear Velocity: Recommended dead volume compounds and procedural instructions.
Methane Retention: Methane retention time (dead volume) for both H2 and He, average linear velocity calculation.
Pressure Conversion Factors: Table of conversion factors.
Measures of Composition: Handy reference chart summarizes ppt, ppm, & ppb measures, based on weight and/or volume.
Mesh Size Conversions: Convert between mesh size, mm, and microns.
Handy Septum Size Chart: Look up the correct septum diameter for your GC.