Use this guide to read GS-Tek GC column catalog numbers and confirm the phase, internal diameter, length, film thickness, or PLOT coating code before ordering. The structure is designed for lab buyers, method developers, and distributors who need to match a GC column specification accurately.
How to Read a GS-Tek GC Column Number
Example: 1525-3002 = GsBP-5MS phase code 15, 0.25 mm ID code 25, 30 m length code 30, and 0.25 um film code 02.
Choose the Phase First
Start with the stationary phase or equivalent column family. Phase choice has the largest impact on selectivity, compound retention, and method compatibility.
Match Dimensions to the Method
Confirm internal diameter and length against the method, carrier-gas flow, resolution target, sample capacity, and instrument configuration.
Confirm Film or Coating
Use film thickness for capillary columns and coating thickness for PLOT columns. Thicker films generally increase capacity and retention for volatile compounds.
GC Column Catalog Number Guide
Standard GC Column Codes
| Internal Diameter | Code |
| 0.10mm | 01 |
| 0.18mm | 18 |
| 0.20mm | 20 |
| 0.25mm | 25 |
| 0.32mm | 32 |
| 0.53mm | 53 |
| Film Thickness | Code |
| 0.10um | 01 |
| 0.15um | 01 |
| 0.25um | 02 |
| 0.33um | 03 |
| 0.50um | 05 |
| 1.0um | 10 |
| 1.5um | 15 |
| 2.65um | 26 |
| 3.0um | 30 |
| 5.0um | 50 |
| Length | Code |
| 5m | 05 |
| 10m | 10 |
| 15m | 15 |
| 25m | 25 |
| 30m | 30 |
| 50m | 50 |
| 60m | 60 |
| 75m | 75 |
| 100m | A0 |
| 105m | A5 |
| 150m | 5A |
PLOT Column Only
| Coating Thickness | Code |
| 5 um | 05 |
| 8 um | 08 |
| 10 um | 10 |
| 15 um | 15 |
| 20 um | 20 |
| 25 um | 25 |
| 30 um | 30 |
| 40 um | 40 |
| 50 um | 50 |