ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.18 | 0.18 | 20 to 340 |
0.25 | 0.25 | 20 to 340 |
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.15 | -60 to 380 |
(Crossbond® 100% dimethyl polysiloxane - optimized for simulated distillation)
Rtx®-2887 columns' stationary phase, column dimensions, and film thickness have been optimized to exceed the resolution and skewing factor requirements currently specified in ASTM method D2887. Each column is individually tested to guarantee a stable baseline with low bleed and reproducible retention times. The Crossbond® methyl silicone stationary phase has increased stability compared to packed columns, ensuring stable baselines and shorter conditioning times.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.53 | 2.65 | -60 to 360 |
(Crossbond® 100% dimethyl polysiloxane - optimized for hydrocarbon analysis)
The Rtx®-1PONA polymer was designed to offer the exact polarity necessary to resolve hydrocarbons in the specific order requested by petrochemical companies. In order to meet the demanding resolution and retention criteria of the American Society for Testing and Materials (ASTM) and the Canadian General Standards Board (CGSB), Restek has developed unique quality control tests and specifications for the Rtx®-1PONA column. The measured values for retention (k), efficiency (n), and stationary phase selectivity (RI) are controlled so that each column exceeds the requirements of the ASTM and CGSB methods.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.50 | -60 to 300/340 |
(Crossbond® polyethylene glycol )
The elution order of polyunsaturated FAMEs on FAMEWAX™ columns is comparable to that on other Carbowax® columns, but baseline resolution is achieved in significantly less time.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.25 | 40 to 250 |
0.32 | 0.25 | 40 to 250 |
0.53 | 0.50 | 40 to 250 |
(Crossbond® Carbowax® polyethylene glycol for acidic compounds)
Stabilwax®-DA bonded polyethylene glycol has an acidic functionality incorporated into the polymer structure. This permits analysis of acidic compounds without derivatization, significantly reduces adsorption of acids, and increases sample capacity for volatile free acids. Stabilwax®-DA columns last longer and give better peak shapes for high molecular weight acids. Some inorganic acids also chromatograph well on a Stabilwax®-DA column; the limitation is the volatility of the acidic compound.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.10 | 40 to 250 |
0.25 | 0.25 | 40 to 250 |
0.25 | 0.50 | 40 to 250 |
0.32 | 0.10 | 40 to 250 |
0.32 | 0.25 | 40 to 250 |
0.32 | 0.50 | 40 to 250 |
0.32 | 1.00 | 40 to 240/250 |
0.53 | 0.10 | 40 to 250 |
0.53 | 0.25 | 40 to 250 |
0.53 | 0.50 | 40 to 250 |
0.53 | 1.00 | 40 to 240/250 |
0.53 | 1.50 | 40 to 230/240 |
(Crossbond® 50% cyanopropylmethyl/50% phenylmethyl polysiloxane)
The cyanopropyl-containing Rtx®-225 phase is slightly less polar than bonded polyethylene glycol (PEG) phases, but it can be used for many of the same applications. Some popular applications for the Rtx®-225 column are analyses of fatty acid methyl esters (FAMES), sugar derivatives, and food and flavor compounds.
Improvements to the Rtx®-225 polymer have increased thermal stability, reduced bleed, and improved inertness. The Rtx®-225 column provides a 20°C thermal stability advantage over other “225” columns because of an unique polymer synthesis technology and proprietary siloxane deactivation. In most similar columns, the Carbowax® deactivation layer is not fully compatible with the cyanopropyl siloxane polymer, which can cause adsorption, tailing of active compounds, and lower efficiency.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.10 | 40 to 220/240 |
0.25 | 0.25 | 40 to 220/240 |
0.25 | 0.50 | 40 to 220/240 |
0.32 | 0.10 | 40 to 220/240 |
0.32 | 0.25 | 40 to 220/240 |
0.32 | 0.50 | 40 to 220/240 |
0.32 | 1.00 | 40 to 200/220 |
0.53 | 0.10 | 40 to 200/220 |
0.53 | 0.25 | 40 to 200/220 |
0.53 | 0.50 | 40 to 200/220 |
0.53 | 1.00 | 40 to 200/220 |
(Crossbond® 100% dimethyl polysiloxane)
Retention index libraries in the flavor and fragrance industry have been compiled from years of data and thousands of compounds. Any slight variation in column selectivity could render the column useless. Rtx®-1 F&F columns are tailored to match the selectivity required in the industry, while offering excellent thermal stability. Our stringent quality testing ensures column-to-column reproducibility and extended column lifetimes over conventional 100% dimethyl polysiloxane columns.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.25 | -60 to 330/350 |
0.25 | 0.50 | -60 to 330/350 |
0.25 | 1.00 | -60 to 320/340 |
0.32 | 0.25 | -60 to 330/350 |
0.32 | 0.50 | -60 to 330/350 |
0.32 | 1.00 | -60 to 320/340 |
0.53 | 0.50 | -60 to 310/330 |
0.53 | 1.00 | -60 to 310/330 |
0.53 | 1.50 | -60 to 310/330 |
(Crossbond® 65% diphenyl/35% dimethyl polysiloxane)
The Rtx®-65TG phase resolves triglycerides by degree of unsaturation as well as by carbon number. Because of the chemistry required to achieve 370°C thermal stability, an Rtx®-65TG column should not be used for analyses of polar compounds.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.10 | -60 to 370 |
0.32 | 0.10 | -60 to 370 |
0.53 | 0.10 | -60 to 360/370 |
(proprietary Crossbond® phase )
Rtx®-VMS columns offer lower bleed, better selectivity, and overall faster analysis for separating volatile organic compounds, such as those listed in US EPA Method 8260. The Rtx®-VMS stationary phase is a highly stable polymer that provides outstanding analysis of volatile compounds, in combination with sensitive ion traps and mass spectrometers. 0.18 and 0.25 mm ID columns allow sample splitting at the injection port, eliminating the added expense and maintenance of a jet separator. A 0.45 mm or 0.53 mm ID column can be directly connected to the purge & trap transfer line in a system equipped with a jet separator.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.18 | 1.00 | -40 to 240/260 |
0.25 | 1.40 | -40 to 240/260 |
0.32 | 1.50 | -40 to 240/260 |
0.45 | 2.55 | -40 to 240/260 |
0.53 | 3.00 | -40 to 240/260 |