Ferrules

Choosing the Right Ferrule

All ferrules are thermally conditioned and ready for immediate high temperature GC use.

Advantages of Graphite Ferrules:

Our graphite ferrules fit Swagelok® or Parker® fittings. Graphite ferrules are soft and compliant. They will not stick to glass at higher temperatures. These ferrules are ideal for glass to metal connections. The graphite ferrule can be reused if not over tightened.

Advantages of Polyimide Ferrules:

Improved mixing techniques for polyimide ferrules allow for better homogenous mixing of graphite and polyimide resin. One can observe this when looking at a polyimide ferrule. The surfaces are very smooth and exhibit a highly polished or highly shined surface. Polyimide ferrules exhibit a lower coefficient of expansion than other polyimide resins, therefore, reducing the tendency of the column nuts loosening in the heated GC ovens.

Advantages of PTFE Ferrules:

The PTFE ferrules are a one piece design and require no back ferrule. These ferrules are completely inert.

Maximum Operating Temperatures                                                             Ferrule Type/Size
100% Graphite ferrules - 450°C                                                                       1/16” x 0.4mm Capillary tubing with ID of 0.10 to 0.25mm
85% Polyimide / 15% Graphite - 400°C                                                           1/16” x 0.5mm Capillary tubing with ID of 0.28 to 0.35mm
60% Polyimide / 40% Graphite - 400°C                                                           1/16” x 0.8mm Capillary tubing with ID of 0.45 to 0.53mm
100% Polyimide ferrules - 350°C                                                                     1/16” x 1.0mm Capillary tubing with ID of 0.75mm 
100% PTFE ferrules - 250°C                                                                            No Hole to create custom fittings or for plugs
                                                                                                                          2-Hole Connects 2 pieces of capillary tubing to the same fitting

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