| Popis: |
According to the criteria of the MAK Commission, carcinogenic substances for which a MAK or BAT value can be derived are classified in Carcinogen Category 4 or 5 if their mechanism of action is known and their contribution to the cancer risk for humans is considered to be nonexistent or very low if the MAK or BAT value is observed. To date, substances that in general fulfill these criteria but for which there are not enough data available to derive a MAK or BAT value have been assigned to Category 3 A to indicate this gap in the dataset. Since the introduction of Carcinogen Category 3 A in 2000, however, the substances classified in this category have frequently been misinterpreted in practice as only “suspected of being carcinogenic”. Therefore, Category 3 A has been removed from the classification system and the substances have been reassigned to Carcinogen Category 1 or 2 and given the annotation “Prerequisite for Category 4 (or 5) in principle fulfilled, but insufficient data available for the establishment of a MAK or BAT value” in the List of MAK and BAT Values. Category 3 B for substances suspected of being carcinogenic has been renamed Category 3. |
