In 2004, the Danish EPA issued a revised list of unwanted substances (Orientering fra Miljøstyrelsen, nr. 8, 2004). The criteria for inclusion in this list were among others the classification of the substances. One of the criteria was classification R42: “May cause sensitization by inhalation”. The following five substances are on the list exclusively because of this classification:
Cyclohexan-1,2-dicarboxylic anhydride (unspec.), CAS 85-42-7
Hexahydro-4-methylphthalic anhydride, CAS 19438-60-9
Phthalic anhydride, Methyltetrahydro- (unspec.), CAS 11070-44-3
Methylendiphenyldiisocyanate (MDI), CAS 26447-40-5, 5873-54-1 and 101-68-8
Glutaraldehyde, CAS 111-30-8