Density: ~0.70 g/mL (free fall density)
General description: Our Carbotrap® and Carbopack™ Graphitized Carbon Black (GCB) product lines are very similar, differing only in whether the particle size is larger or smaller than 40 mesh. Our GCB materials 40 mesh and larger (e.g. 20/40) belong in the Carbotrap® product line, whereas our GCB materials 40 mesh and smaller (e.g. 40/60, 60/80, 80/100, etc.) belong in the Carbopack™ product line. The larger 20/40 Carbotrap® materials are typically used in 4 mm and larger internal diameter (I.D.) air monitoring tubes, permitting high flow rates without excessive pressure drops. 40/60 Carbopack™ materials are typically used in <4 mm I.D. air monitoring tubes, to prevent the channeling that would occur if a large 20/40 material was used in a small-bore tube. The smaller 60/80, 80/100, etc. Carbopack™ materials are typically used for all other applications (e.g. GC columns, SPE tubes, purge traps, purification, low-flow air sampling, etc.). As a general rule, use the smallest available particle size as long as the application can accommodate the pressure drop.
For more information about any of our carbon adsorbents, please visit sigma-aldrich.com/carbon
Other Notes: While these carbon materials are stable to above 400 °C, the temperature actually used at depends on the application. For example, thermal desorption unit (TDU) tubes are typically desorbed at 330 °C, purge traps containing just carbons typically use a 250 °C desorption temperature, and GC column applications may work best with final oven temperatures of 225 °C. For assistance in determining the proper temperature for your application, contact Technical Service at techservice@sial.com
Legal Information: Carbotrap is a registered trademark of Sigma-Aldrich Co. LLC
Density: ~0.70 g/mL (free fall density)
Matrix: Carbotrap® C
Packaging: bottle of 10 g
Particle Size: 20-40 mesh
Pore Size: ~0 cm3/g microporosity
Suitability: suitable for S7 per USP
Surface Area: ~100 m2/g