Efficiency in an activated carbon filter largely is determined by the weight of carbon rather than placement, according to a study by Filtrona Scientific Services.

Four types of activated carbon filters were examined for retention rates of vapour-phase compounds including carbonyls, hydrocarbons, phenols, cresols and semi-volatile compounds. According to Dr. Mike Taylor, director of scientific development at the laboratory, weight is the dominant factor affecting retention of vapour phase compounds.
“The results from this study are consistent with previous findings that the rapid diffusion of volatile compounds while passing through a carbon filter enables their removal irrespective of the position of the carbon granules in relation to the main smoke flow path,” Taylor said in a statement.
A free download of the complete study is available at: www.filtronafilters.com/researchpapers
Filtrona Scientific Services is an independent laboratory offering commercial and analytical testing to tobacco clients for product development and to meet regulatory requirements. (pi)