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United States Pharmacopeia (USP) GC Phases

In the United States Pharmacopoeia, the stationary phases of GC and HPLC (column liquid phase, carrier, etc.) are indicated with a code number. Representative code numbers and corresponding capillary columns are summarized in the table below.

USP Phase Composition GL Phase
G1 Dimethylpolysiloxane oil InertCap 1MS InertCap 1
G2 Dimethylpolysiloxane gum InertCap 1MS InertCap 1
G3 50 % Phenyl - 50 % methylpolysiloxane InertCap 17MS InertCap 17
G6 Trifluoropropylmethyl polysiloxane InertCap 210
G7 50 % 3-Cyanopropyl - 50 % phenylmethylsilicone InertCap 225
G14 Polyethylene glycol(av.mot.wt.of 950 to 1050) InertCap Pure-WAX InertCap WAX InertCap WAX-HT
G15 Polyethylene glycol(av.mot.wt.of 3000 to 3700) InertCap Pure-WAX InertCap WAX InertCap WAX-HT
G16 Polyethylene glycol compound(av.mot.wt.about 15,000).
A high molecular weight compound of with a diepoxide linker Polyethylene glycol
InertCap Pure-WAX InertCap WAX InertCap WAX-HT
G19 25 % Phenyl - 25 % cyanopropyl - 50 % methylsilicone InertCap 225
G20 Polyethylene glycol(av.mot.wt.of 380 to 420) InertCap Pure-WAX InertCap WAX InertCap WAX-HT
G27 5 % Phenyl - 95 % methylpolysiloxane InertCap 5MS/Sil InertCap 5MS/NP InertCap 5
G28 25 % Phenyl - 75 % methylpolysiloxane InertCap 25 InertCap AQUATIC InertCap AQUATIC-2
G35 A high molecular weight compound of a polyethylene glycol and a diepoxide that is eaterifed with nitroterephthalic acid. InertCap FFAP
G36 1 % Vinyl - 5 % phenylmethylpolysiloxane InertCap 5MS/Sil InertCap 5MS/NP InertCap 5
G38 Phase G1 containing a small percentage of a tailing inhibitor InertCap 1MS InertCap 1
G39 Polyethylene glycol(av.mol.wt.of about 1500) InertCap Pure-WAX InertCap WAX InertCap WAX-HT
G42 35 % phenyl-65 % dimethylpolysiloxane(percentage refer to molar substitution) InertCap 35
G43 6 % cyanopropylphenyl-94 % dimethylpolysiloxane InertCap 624 InertCap 1301
G46 14 % Cyanopropylphenyl - 86 % methylpolysiloxane InertCap 1701
G47 Polyethylene glycol(av.mol.wt.of about 8000) InertCap Pure-WAX InertCap WAX InertCap WAX-HT