| 摘要 |
<p>A filter material for removing at least one given substance from an at least substantially gaseous medium, such as tobacco smoke, comprises a cross-linked carbohydrate polymer which is swellable to a given degree and which has the form of an open-pore three-dimensional micro-porous network, there being substantially uniformly distributed therein at lease one agent able to remove said substance in a substantially selective manner from the medium passing through the filter.</p> |
