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Carbon Adsorbents
Physical Characteristics and Selection Guide
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To view the approximate surface area, pore volume, pore diameter, and free fall density for each of our specialty carbons (Carbotrap™, Carbopack™, Carboxen™, Supelcarb™, and Carbosieve™), simply click the graphic below. If you are unable to download this, contact Technical Service at techservice@sial.com.
Use this handy cross-reference table to find our equivalents or substitutions for commonly used carbon adsorbents, including some that are discontinued.
| Carbon |
Our Equivalent or Substitute |
| Ambersorb 347 |
Carboxen 564 |
| Ambersorb 563 |
Carboxen 563 |
| Ambersorb 572 |
Carboxen 572 |
| Anasorb CMS |
Carboxen 564, Carboxen 1000, Carbosieve S-III |
| Anasorb CSC |
Activated (coconut) charcoal |
| Anasorb GCB1 |
Carbotrap B, Carbopack B |
| Anasorb GCB2 |
Carbotrap C, Carbopack C |
| Anasorb 747 |
Carboxen 564, Carboxen 1000, Carbosieve S-III |
| Carbograph 1 |
Carbotrap B, Carbopack B |
| Carbograph 2 |
Carbotrap C, Carbopack C |
| Carbosphere |
Carboxen 1000 |
| Graphpac-GC |
Carbotrap B, Carbopack B |
| Purosieve |
Carboxen 1000 |
| Spherocarb |
Carboxen 1000 |
When working with multi-bed air monitoring tubes, use the weaker adsorbents in front to protect the stronger adsorbents. This prevents analytes from becoming strongly retained on the stronger adsorbents, resulting in poor analyte release during the chemical or thermal desorption process. The table below shows relative adsorptive strengths for our specialty carbon materials. As an example, use Carbopack C in front of Carbopack B.
Analyte
Size (1) |
Adsorptive
Strength |
Adsorptive Strength
(Weakest - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > Strongest) |
| >C14 |
Weakest
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∨
Strongest |
Carbotrap/Carbopack F |
| C12-C20 |
Carbotrap/Carbopack C |
| C9-C14 |
Carbotrap/Carbopack Y |
| C5-C12 |
Carbotrap/Carbopack B, Carboxen 1017, Carboxen 1016 |
| C3-C9 |
Carbopack Z, Carbotrap/Carbopack X |
| C2-C5 |
Carboxen 569, Carboxen 1001, Carboxen 1012, Carboxen 1000, Carboxen 572, Carboxen 1006, Carbosieve S-II, Carbosieve G, Carbosieve S-III, Carboxen 1003, Supelcarb, Carboxen 563, Carboxen 564, Carboxen 1018, Carboxen 1010, Carboxen 1021 |
1. Analyte size relative to n-alkanes. Consider all atoms, not just carbon. For example, even though 1,2-dichloroethane is a C2, the two chlorine atoms give it a relative size between C4 and C5.
| A Tool for Selecting an Adsorbent for Thermal Desorption Applications |
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| Detailed adsorption/desorption characteristics of fifteen of our specialty carbons plus nine other adsorbents, depicted in twenty-four easy-to-follow color-coded tables, are shown in A Tool for Selecting an Adsorbent for Thermal Desorption Applications (T402025 HTA). To download your no-charge copy of this Technical Report, simply click the graphic of the report cover. If you are unable to download this, contact Technical Service at techservice@sial.com. |
(288Kb PDF) |
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