Chromosorb, inert column-packing aggre gate, is a specially treated grade of J-M Celite*, the diatomaceous silica that was used in earliest gas chromatography studies.
You a l w a y s get a g o o d "picture" with J o h n s - M a n v i l l e C h r o m o s o r b A s an aggregate in gas-liquid partition chromatography, J - M Chromosorb® gives high partitioning effect with maximum number of theoretical plates. Good resolution is obtained because it is chemically inert a n d
Packing is easy. I t s physical stability a n d non-adsorption let you re-use the same column packing again and again. For further information, contact t h e dealer nearest you. «come ι* joh..s-Manviiie-s restored trade
"
mark for its diatomaceous silica products.
won'tadsorbcomponentsbeing passed through. YOU get uniform results, Optimum reproducibility, and good
flow of carrier gas without excessive , pressure drop. C h r o m o s o r b combines o p t i m u m Surface v
area
with
high
^ Uniformity.
For reduction of fines, all grades are water-screened t o close tolerances.
For gas phase chromatography or where inertness is needed . . . Chromosorb T ica
w ' Properties
Calcined diatomaceous earth aggregate. Color m De 5i b5 /cu ft (avgJ
l ™l
" V -
- '
Specific Gravity—true Water Absorption—cc./gr. (avg.) Μ % by wei9ht m a, imum '. . . .'. :.'.' ρ Η°^ν5!Γ ,
surface Area—sq. m./gm. (avg.)
Iight pink 2 0
^l
2.15 2.4
.'.'.'\.'.'.'.'£7 3-5
For c h r o m a t o g r a p h i c studies . · s Chromosorb W Typical Properties Flux calcined diatomaceous earth aggregate. Color white Free Fall Density—lbs./cu. f t . (avg.) 15-16 Specific Gravity—true 2.30 Water Absorption—cc./gr. (avg.) 4.0-5.0 Moisture—% by weight, maximum 1.0 pH (avg.) 8-10 Surface Area (BET Method)—sq. m./gr. (avg.) 3-4
For fine filtration of liquids in laboratory application... Celite Analytical Filter Aid Quality diatomite, calcined at high temperatures and acid-washed to remove organic and inorganic impurities. Filters out all types of precipitates, including the difficult-to-handle gelatinous and semi-colloidal materials, and produces brilliantly clear filtrates at high flow rates.
JOHNS MANVIU.B
JOHNS-MANVILLE P B . O D U C T S
Circle No. 121 on Readers' Service Card VOL. 3 4 , N O . 2 . FEBRUARY 1 9 6 2
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