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KRC - Knitted Reactor Coils | Delay Tubes for NMR | Post Column Reactors

The Knitted Reactor Coils (KRC) are made by knitting 1/16th OD, PTFE tubing into very precise “folds”. They are intended to be used with the Post Column Photochemical Reactor or can be used as “Delay Tubes” for Flow Injection Analysis (FIA).

In both cases, the inserted, extra flow path length creates a delay line so that any post column reaction can take place and enhances detection methods such as UV or sometimes in Mass Spec. The coiling effect or “folds” in the knitted coil minimizes post column band spreading by “folding” the separated sample plug onto itself in a torturous path. Radial mixing takes place but not axial dispersion.

The coils are available in variety of tubing lengths and internal diameters (ID) ranging from 5 meters long and 0.25mm ID up to 25 meters long with an ID of 0.75mm.

The KRC can also, be ordered as a Knitted Delay Tube (KDT) which includes 2 each, 2mm ID, flangeless ferrules and two flangeless nuts for connecting to ¼-28 fittings. An optional connector/adapter, with female ¼-28 and female 10-32 threads and a 1mm thru hole is available for connection of ¼-28 fittings to standard 1/16th inch HPLC Tubing. Please inquire for more information.


The Selection "FILTER" buttons refine the Products displayed in the Ordering Chart. They are described below and listed alphabetically by FILTER.

  • Delay Tubes - Folded PTFE with 2mm ID flangeless ferrules and two flangeless nuts for connecting to ¼-28 fittings.

  • ID: 0.25mm, 0.5mm and 0.75mm

  • Knitted Coils - (KRC) Folded PTFE tubing with end fittings.

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