Chromatography

Rtx-VRX

(proprietary Crossbond® phase )

• Application-specific columns for volatile organic pollutants.
• Excellent for US EPA Method 8021 compounds.

The Rtx®-VRX stationary phase and optimized column dimensions provide low bleed, excellent resolution, and fast analysis times for volatile compounds.

Applications

• Volatile organic pollutants

Rtx-VGC

(proprietary Crossbond® phase )

• Application-specific columns for volatile organic pollutants by GC/PID/ELCD. Excellent separation of trihalomethanes.
• Complete US EPA Method 8021A analysis in less than 28 minutes.
• Restek exclusive phase.

Using computer modeling techniques, we optimized the Rtx®-VGC column for analysis of volatile organic compounds on GC systems equipped with photoionization (PID) and electrolytic conductivity detectors (ELCD). It performs the most difficult separations of volatile organic compounds, such as those listed in US EPA Methods 502.2 and 8021, providing unsurpassed separation in the fastest analysis time, thereby increasing sample throughput. The Rtx®-VGC column provides >=85% resolution of trihalomethanes (THMs) from other volatile compounds. This unique column also achieves excellent separation of gases and early eluting compounds.

Applications

• Volatile organic pollutants

Rtx-Dioxin2

• Isomer specificity for 2,3,7,8-TCDD and 2,3,7,8-TCDF achieved with one GC column.
• Thermally stable to 340°C for longer lifetime.
• Unique selectivity for toxic dioxin and furan congeners allow use as a primary or confirmation GC column.

Applications

• Dioxin or furan congeners

Rtx-Dioxin

• Replacement column for 5% diphenyl phases.
• Improved separations of dioxin or furan congeners.
• Greater thermal stability than 5% diphenyl phases or high-cyano confirmation columns.

Applications

• Dioxin or furan congeners

Rtx-2887

(Crossbond® 100% dimethyl polysiloxane - optimized for simulated distillation)

• Application-specific columns 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.

Applications

• Simulated distillation

Rtx-1 PONA

(Crossbond® 100% dimethyl polysiloxane - optimized for hydrocarbon analysis)

• Application-specific columns meet ASTM and CGSB requirements for detailed 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.

Applications

• Detailed hydrocarbon analysis

FAMEWAX

(Crossbond® polyethylene glycol )

• Application-specific columns for FAME.

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.

Applications

• FAME

Stabilwax-DA

(Crossbond® Carbowax® polyethylene glycol for acidic compounds)

• Application-specific columns for free (underivatized) acids, some inorganic acids.
• Resistant to oxidative damage.
• Equivalent to USP G25, G35 phases.

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.

Applications

• Free fatty acids

Rtx-225

(Crossbond® 50% cyanopropylmethyl/50% phenylmethyl polysiloxane)

• Polar phase.
• Equivalent to USP G7, G19 phase.

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.

Applications

• FAMEs
• Carbohydrates derivetes
• Sterols
• Flavor compounds

Rtx-1 F&F

(Crossbond® 100% dimethyl polysiloxane)

• Application-specific columns for flavor and fragrance compounds.

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.

Applications

• Flavor and fragrance compounds