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GC COLUMNS | PACKED/MICROPACKED COLUMNS
USP Liquid Phase & Solid Support Cross-Reference
Restek can meet all of your packed column needs for U.S. Pharmacopeia methods. Commonly used USP liquid phases and supports
are listed below. Call Restek or your representative for a quote on your next packed column for pharmaceuticals.
USP Phase Description Restek-Supplied Equivalent
G1 Dimethylpolysiloxane oil Rt-2100, OV-101, Rtx-1
G2 Dimethylpolysiloxane gum OV-1, Rtx-1
G3 50% Phenyl-50% methylpolysiloxane Rt-2250, OV-17
G4 Diethylene glycol succinate polyester DEGS
G5 3-Cyanopropylpolysiloxane Rt-2340
G6 Trifluoropropylmethylpolysiloxane Rt-2401, OV-210
G7 50% 3-Cyanopropyl-50% phenylmethylsilicone Rt-2300
G8 80% Bis (3-cyanopropyl)-20% phenylpolysiloxane Rt-2330
G9 Methylvinylpolysiloxane UCW 98
G11 Bis(2 ethylhexyl) sebecate polyester Bis(2 ethylhexyl) sebecate polyester
G12 Phenyldiethanolamine succinate polyester Phenyldiethanolamine succinate polyester
G13 Sorbitol Sorbitol
G14 Polyethylene glycol (average mol. wt. 950-1050) Carbowax 1000
G15 Polyethylene glycol (average mol. wt. 3000-3700) Carbowax 4000
G16 Polyethylene glycol compound (average mol. wt. 15,000), a high molecular weight compound of Carbowax 20M
polyethylene glycol and a diepoxide linker
G17 75% Phenyl-25% methylpolysiloxane OV-25
G18 Polyalkylene glycol UCON LB 550X
G19 25% Phenyl-25% cyanopropyl-50% methylsilicone OV 225
G20 Polyethylene glycol (average mol. wt. 380-420) Carbowax 400
G21 Neopentyl glycol succinate Neopentyl glycol succinate
G22 Bis(2 ethylhexyl) phthalate Bis(2 ethylhexyl) phthalate
G23 Polyethylene glycol adipate, ethylene glycol adipate EGA
G24 Diisodecyl phthalate Diisodecyl phthalate
G25 Polyethylene glycol compound TPA, a high molecular weight compound of a polyethylene Carbowax 20M TPA
glycol and a diepoxide that is esterified with terephthalic acid
G26 25% 2-Cyanoethyl-75% methylpolysiloxane XE 60
G27 5% Phenyl-95% methylpolysiloxane SE-52, Rtx-5
G28 25% Phenyl-75% methylpolysiloxane DC 550
G29 3,3'-Thiodipropionitrile TDPN
G30 Tetraethylene glycol dimethyl ether Tetraethylene glycol dimethyl ether
G31 Nonylphenoxypoly(ethyleneoxy)ethanol (average ethyleneoxy chain length is 30): nonoxynol 30 Igepal CO 880
G32 20% Phenylmethyl-80% dimethylpolysiloxane OV-7
G33 20% Carborane® -80% methylsilicone Dexsil 300
G34 Diethylene glycol succinate polyester stabilized with phosphoric acid DEGS PS
G35 A high molecular weight compound of a polyethylene glycol and a diepoxide that is esterified Rt-1000
with nitroterephthalic acid
G36 1% Vinyl-5% phenylmethylpolysiloxane SE 54, Rtx-5
G38 Phase G1 containing a small amount of tailing inhibitor Rt-2100/0.1% Carbowax 1500
G39 Polyethylene glycol (average mol. wt. 1500) Carbowax 1500
G40 Ethylene glycol adipate EGA
USP Support Description Restek-Supplied Equivalent
S1A Siliceous earth, see method for details on treatment SilcoportW
S1AB Siliceous earth, treated as S1A and both acid- and base-washed Silcoport WBW
S1C Crushed firebrick, calcined or burned with a clay binder >900 °C, acid-washed, may be silanized Chromosorb PAW or PAW DMDCS
S1D Crushed firebrick, calcined or burned with a clay binder >900 °C, not acid-washed, may be silanized Chromosorb PNAW
S1NS Untreated siliceous earth Chromosorb W- Non Acid Washed
S2 Styrene-divinylbenzene copolymer with nominal surface area of less than 50 m2/g and an Chromosorb 101
average pore diameter of 0.3 to 0.4 µm
S3 Ethylvinylbenzene-divinylbenzene copolymer with nominal surface area of 500 to 600 m2/g and an HayeSep Q
average pore diameter of 0.0075 µm
S4 Styrene-divinylbenzene copolymer with aromatic -O and -N groups having a nominal surface HayeSep R
area of 400 to 600 m2/g and an average pore diameter of 0.0076 µm
S5 High molecular weight tetrafluorethylene polymer, 40- to 60-mesh Chromosorb T
S6 Styrene-divinylbenzene copolymer having a nominal surface area of 250 to 350 m2/g and an Chromosorb 102
average pore diameter of 0.0091 µm HayeSep P
S7 Graphitized carbon having a nominal surface area of 12 m2/g CarboBlack C
S8 Copolymer of 4-vinyl-pyridine and styrene-divinylbenzene HayeSep S
S9 Porous polymer based on 2,6-diphenyl- p-phenylene oxide Tenax TA
S10 Highly cross-linked copolymer of acrylonitrite and divinylbenzene HayeSep C
S11 Graphitized carbon having a nominal surface area of 100 m2/g, modified with small amounts of CarboBlack B 80/120 3% Rt 1500
petrolatum and polyethylene glycol compound
S12 Graphitized carbon having a nominal surface area of 100 m2/g CarboBlack B