USP Specification for GC Support
CodeSupport

Commercially Available

S1A

Siliceous earth for gas chromatography has been flux-calcined by mixing diatomitewith Na2CO3 flux and calcining above 900°. The siliceous earth is acid-washed, thenwater-washed until neutral, but not base-washed. The siliceous earth may besilanized by treating with an agent such as dimethyldichlorosilane to mask surface
silanol groups.

Shimalite-W AW-DMCS
Shimalite-W AW
Chromosorb-W HP
Chromosorb-W AW-DMCS
Chromosorb-W AW

S1AB

The siliceous earth as described above is both acid- and base-washed.

Chromosorb-W HP

S1C

A support prepared from crushed firebrick and calcined or burned with a clay binder
above 900° with subsequent acid-wash. It may be silanized.

Shimalite AW-DMCS
Shimalite AW
Chromosorb-P AW-DMCS
Chromosorb-P AW

S1D

A support prepared from crushed firebrick and calcined or burned with a clay binder
above 900°, not acid washed. It may be silanized.

Shimalite NAW
Chromosorb-P NAW

SINS
S2

Shimalite-W NAW
Chromosorb-W NAW
Styrene-divinylbenzene copolymer having a nominal surface area of less than 50 m2 Sunpak-Hper g and an average pore diameter of 0.3 to 0.4 μm.
Chromosorb-101
The siliceous earth is untreated.

S3Copolymer of ethylvinylbenzene and divinylbenzene having a nominal surface
area of 500 to 600 m2 per g and an average pore diameter of 0.0075 μm.

Sunpak-A
Porapak-Q

S4

Styrene-divinylbenzene copolymer with aromatic –O and –N groups, having anominal surface area of 400 to 600 m2 per g and an average pore diameter of0.0076 μm.

Porapak-R

S540- to 60-mesh, high-molecular weight tetrafluorethylene polymer.

Shimalite-FChromosorb-T

S6

Styrene-divinylbenzene copolymer having a nominal surface area of 250 to 350 m2
per g and an average pore diameter of 0.0091 μm.

Porapak-P
Chromosorb-102

S8Copolymer of 4-vinyl-pyridine and styrene-divinylbenzene.

Porapak-S

S9A porous polymer based on 2,6-diphenyl-p-phenylene oxide.

Tenax-TA

USP Specification for GC Stationary Phase
CodeSupport

G1

Dimethylpolysiloxane oil.

G2

Dimethylpolysiloxane gum.

G350% Phenyl-50% methylpolysiloxane.

G4Diethylene glycol succinate polyester.

G6

Trifluoropropylmethylpolysiloxane.

G750% 3-Cyanopropyl-50% phenylmethylsilicone.

Commercially Available
ULBON HR-1
Silicone OV-101
Silicone DC-200
ULBON HR-1
Silicone OV-1
Silicone SE-30
ULBON HR-17
Silicone OV-17
DEGS
Silicone OV-210
Silicone DC QF-1
Silicone OV-225

G11Bis(2-ethylhexyl)sebacate polyester.

Octoil-S (DOS)G13

Sorbitol.

G14

Polyethylene glycol (av. mol. wt. of 950 to 1050).

G15

Polyethylene glycol (av. mol. wt. of 3000 to 3700)

SorbitolPEG-1000
Carbowax-1000
PEG-4000
Carbowax-4000

G16

Polyethylene glycol compound (av. Mol. wwt. About 15,000). A high molecularweight compound of polyethylene glycol with a diepoxide linker. Available
commercially as Polyethylene Glycol Compound 20M, or as Carbowax 20M, fromsuppliers of chromatographic reagents.

ULBON HR-20M
PEG-20M
Carbowax-20M

G1775% Phenyl-25% methylpolysiloxane.

Silicone OV-25

G18

Polyalkylene glycol.

Ucon LB-550X

G1925% Phenyl-25% cyanopropyl-50% methylsilicone.

G20

Polyethylene glycol (av. Mol. wt. of 380 to 420).

G21

Neopentyl glycol Succinate.

Silicone OV-225
PEG-400
Carbowax-400
Neopentylglycol succinate (NGS)G22Bis(2-ethylhexyl) phthalate.

Dioctyl phthalate (DOP)

G23

Polyethylene glycol adipate.

Ethyleneglycol adipate (EGA)

G24

Diisodecyl phthalate.

Diisodecyl phthalate (DIDP)

G25

Polyethylene glycol compound TPA. A high molecular weight compound of aPEG-20M TPA
polyethylene glycol and a diepoxide that is esterified with terephthalic acid. Available
Carbowax-20M TPA
commercially as Carbowax 20M-TPA from suppliers of chromatographic reagents.

G27

5% Phenyl-95% methylpolysiloxane.

G2825% Phenyl-75% methylpolysiloxane.

ULBON HR-52Silicone SE-52
Silicone SE-54
Silicone DC-550

G29

3,3’-thiodipropionitrile.

3,3’-thiodipropionitrile (TDPN)

G30

Tetraethyleneglycol dimethyl ether (BMEE)

G32

Tetraethylene glycol dimethyl ether.
Nonylphenoxypoly(ethyleneoxy)ethanol (av. Ethyleneoxy chain length is 30);
Nonoxynol 30.
20% Phenylmethyl-80% dimethylpolysiloxane.

Silicone OV-7

G34

Diethylene glycol succinate polyester stabilized with phosphoric acid.

DEGS+H3PO4G35

A high molecular weight compound of a polyethylene glycol and a diepoxide that isesterified with nitroterephthalic acid.

FONFFAP

G361% vinyl-5% phenylmethylpolysiloxane.

ULBON HR-52
Silicone SE-52
Silicone SE-54

G39

Polyethylene glycol (av. Mol. wt. about 1500).

G40

Ethylene glycol adipate.

PEG-1500
Carbowax-1500
Ethyleneglycol adipate (EGA)

G41

Phenylmethyldimethylsilicone (10% phenyl-substituted).

Silicone OV-3

G4235% phenyl-65% dimethylpolysiloxane (percentages refer to molar substitution).

Silicone OV-11

G442% low molecular weight petrolatum hydrocarbon grease

Apiezon-LG45

Divinylbenzene-ethylene glycol-dimethylacrylate.

Porapak-N

G4614% cyanopropylphenyl-86% methylpolysiloxane.

ULBON HR-1701

G31

Igepal CO-880