UltraALLOY TM  
 STAINLESS STEEL CAPILLARY COLUMNS
  • High temperature stability
  • Highly inert deactivated inner surface
  • Exceptional mechanical durability-cannot break!
  • Perfect for field use or high vibration situations
  • Can be tightly coiled (3 inches) for portable GCs
  • Ideal for use in SRI Instruments GCs

 

The inertness of Ultra ALLOY TM stainless steel columns matches that of fused silica and is derived from a patented, multi-step manufacturing process which utilizes a five-layered pretreatment of the inner surface of the stainless steel.


SEM images of Ultra-Alloy tubing surface, 
before deactivation (left) and after deactivation (right).

Each layer is chemically stable at elevated temperatures and has equal to, if not superior, mechanical properties to that of the steel tubing. The layers are less than 0.01 microns thick and are chemically bonded together. Stationary phases are then easily bonded to this stable inert surface resulting in superbly deactivated columns which compare directly to fused silica columns.

UAC-1, 10M. x 0.25mm x 0.25um film DB-1, 10M. x 0.25mm x 0.25um film
1st injection 81st injection 1st injection 20th injection

A comparison of a UAC-1 (methyl silicone) stainless steel column and a fused silica DB-1 column.
Consecutive injections of 5% rapeseed oil, 120oC isothermal, split injection.

Accordingly, Ultra ALLOY TM capillary columns offer unsurpassed inertness and mechanical durability and are suitable replacements for fused silica capillary columns. Unlike other stainless steel columns on the market, Ultra- ALLOY TM columns are not lined with fused silica (see photo below) which can crack or flake-off when flexed or bent thus exposing active sites. As a result, the Ultra-ALLOYTM columns can be tightly coiled to accommodate even the smallest of GC oven designs. 

 SEM Photo of stainless steel tubing 
with fused silica layer.
(Photo courtesy of Valco Instruments)

Ultra ALLOY TM columns are available in the standard  0.25mm and 0.50mm I.D.s The tables below list the available bonded phases, films and maximum temperatures. Go to the Ultra ALLOY TM Ordering Information Section for available lengths and pricing.  Deactivated Ultra ALLOY TM tubing is also available for transfer lines and guard columns.

AVAILABLE COLUMN CONFIGURATIONS
    Film Thickness (µm) Maximum Temp. oC
Phase Code Composition 0.25mm I.D. 0.50mm I.D. Isothermal Programmed
UAC-1 Methyl silicone 0.15, 0.25, 0.5, 1.0* 0.15, 0.25, 0.5, 1.5*, 5.0* 350 / 380 330* / 360
UAC-1HT Methyl silicone - high temperature 0.15, 0.25 0.15, 0.25 400 / 420  
UAC-5 Methyl 5% phenyl silicone 0.15, 0.25, 1.0* 0.15, 1.5* 350 / 380 330* / 360
UAC-DX30 Carborane siloxane (Dexsil 300) 0.15 0.15 450  
UAC-17 Methyl 50% phenyl silicone 0.15, 0.25 1.0* 370 / 390 350* / 370
UAC-CW Polyethylene glycol (Carbowax) 0.25 1.0* 260 240*
UAC-TRG Triglyceride phase 0.15   370 / 380  
UAC-502 Volatile Organics phase 1.0 3.0 270  
UAC-624 Volatile Organics Phase 1.0 3.0 280  
UAC-DIDP Diisodecyl phthalate (non-bonded) 0.4   150  

Click here for Ultra-ALLOY ordering information

Ultra ALLOY and UA are trademarks of Frontier Laboratories, Fukushima, Japan.


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