S1A

Siliceous earth for gas chromatography has been flux-calcined by mixing diatomite with Na2CO3 flux and calcining above 900 ℃ . 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 ℃ 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. ＊
Chromosorb W NAW

S2

Styrene-divinylbenzene copolymer having a nominal surface area of less than 50 m2

per g and an average pore diameter of 0.3 to 0.4 μm.

Chromosorb 101

S3

Copolymer 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.

Porapak™ Q

Hayesep Q

S4

Styrene-divinylbenzene copolymer with aromatic - O and - N groups, having a nominal

surface area of 400 to 600 m2 per 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 to 350 m2 per 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 per 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 per 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 per g.

Carbopack B