S1A

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

Uniport HP
Chromosorb W HP
Chromosorb W AW DMCS

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 ºC with subsequent acid-wash. It may be silanized.

Uniport C, Uniport CS
Chromosorb P AW
Chromosorb P AW DMCS

S1NS

The siliceous earth is untreated.

Celite 545 etc.

S2

Styrene-divinylbenzene copolymer having a nominal surface area of less than 50 m²/g and an average pore diameter of 0.3 µm to 0.4 µm.

Chromosorb 101*

S3

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

Porapak™ Q
Hayesep Q

S4

Styrene-divinylbenzene copolymer with aromatic - O and N groups, having a nominal surface area of 400 m²/g  to 600 m²/g and an average pore diameter of 0.0076 µm.

Porapak™ R
Hayesep R

S5

40- to 60-mesh, high-molecular weight tetrafluoroethylene polymer.

Flusin T
Flusin T6
Chromosorb T

S6

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

Chromosorb 102*
Porapak™ P
Hayesep P

S7

Graphitized carbon having a nominal surface area of 12 m²/g .

Unicarbon A
Carbopack C

S8

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

Porapak™ S
Hayesep S

S9

A porous polymer based on 2,6-diphenyl-p-Phenylene oxide.

Tenax TA

S10

A highly polar cross-linked copolymer of acrylo-nitrile and divinylbenzene.

Hayesep C

S11

Graphitized carbon having a nominal surface area of 100 m²/g modified with small amounts of petrolatum and polyethylene glycol Compound.

3 % SP1500/
Carbopack B

S12

Graphitized carbon having a nominal surface area of 100 m²/g .

Carbopack B