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Chemical groups on the SIN List

The SIN List contains about 1000 CAS numbers, quite an overwhelming figure. But many chemicals are similar in terms of chemical structure, toxicological properties and technical functions. more or less.

For many reasons it can be wise to tackle chemicals on a group level, rather than substance by substance.

The substances on the SIN List have been divided into 15 substance groups, some of which have been further divided into subgroups.



Contains phenols with lipophilic alkyl groups of at least four carbons attached to the aromatic ring with a carbon-carbon bond in the orto and para position. The aromatic ring can contain other functional groups as well. The phenol oxygen is unsubstituted or ethoxylated.




Contains compounds with two or more fused aromatic rings. The rings can be substituted with, halogen, nitro and amino groups.

Other aromatics

Contains simple aromatic compounds.



Contains compounds in which two phenols are bridged with one carbon or heteroatom. The bridge-atom can be oxidized or substituted with hydrogen, alkyls, phenyl and esters. The phenol oxygens are unsubstituted.


Carbon Nanotubes

Carbon nanotubes (CNTs) are cylindrical tubes of hexagonal arrangement of carbon atoms linked by a double bond. CNTs have a very high aspect ratio and their diameter can be much lower than 100 nm whereas their lengths can reach several hundred micrometers. There are different types of CNTs depending on the number of side-walls and their atomic structure in the side-walls. The simplest CNTs are single-walled (SWCNT), double-walled (DWCNT) and multi-walled (MWCNT).


Fluorinated compounds

Contains compounds with fluorinated alkyl chains. At least six carbons in each chain are fully fluorinated. The fluorinated chain is substituted at one end with sulphonamides, sulphonic acid, phosphates or carboxylic acid Some compounds contain unfluorinated carbons but are in this context treated as perfluorinated compounds (PFCs).


Glycol ethers

Contains ethers and esters of mono and poly 1,2-ethanediols and 2-hydroxyacetic acid. The carbon backbone can be further substituted with alkyl groups.


Halogenated compounds

Polyhalogenated alkanes

Contains brominated and/or chlorinated alkanes. The number of halogens is three or more, distributed over two or more carbons. At least two carbons are halogenated. There are at least one halogen/five carbons.

Polyhalogenated alkenes

Contains brominated and/or chlorinated alkenes. The double bond is substituted with two or more halogens.

Polyhalogenated aromatics

Contains brominated and/or chlorinated aromatic compounds with one benzene ring with at least three halogens or two or more benzene rings with at least two halogens on each ring.


Heavy metals

Antimony compounds

Contains salts and complexes of oxidized antimony.

Arsenic compounds

Contains salts and complexes of oxidized arsenic.

Beryllium compounds

Contains oxidized and metallic beryllium.

Boron compounds

Contains salts and complexes of oxidized boron.

Cadmium compounds

Contains salts and complexes of oxidized cadmium as well as metallic cadmium.

Chromium compounds

Contains salts and complexes of chromium(VI).

Cobalt compounds

Contains salts and complexes of oxidized cobalt.

Copper compounds

Contains salts and complexes of oxidized copper.

Lead compounds

Contains salts and complexes of oxidized lead, organolead compounds and metallic lead.

Mercury compounds

Contains metallic mercury.

Nickel compounds

Contains salts and complexes of oxidized nickel.

Organotin compounds

Contains organotin compunds.


Highly reactive compounds

Contains compounds with the following reactive electrophilic groups; anhydrides, carbamoyl chlorides, carbonyl chlorides, epoxides, aziridines, alkyl sulphates, sulphamoyl chlorides, primary alkylbromides, allylic and benzylic halogens, cationic triarylmethanes, α,β-Unsaturated carbonyl compounds, mustard-type compounds, dialkyl sulphates, sulphamoyl chlorides, sultones, diazo alkyls, chloromethyl ethers and 1,2-dihalo alkyls.


Mineral fibres

Contains naturally occurring fibrous zeolites, asbestos-type minerals and synthetic mineral wools.


Nitrogen compounds


Contains hazardous primary, secondary and tertiary amines.

Aminocarbonyl compounds

Contains amides, carbamates and similar aminocarbonyl compounds.

Aromatic amines

Contains compounds with benzene rings substituted with amino-, alkylamino-, amide-, phenylhydrazine- or phenylazo- groups.

Azo compounds

Contains both aromatic and non-aromatic azo compounds.


Contains hydrazine and alkylated hydrazines.

Nitro compounds

Contains nitroaromatic and secondary nitroalkyl compounds.


Contains alkylated and acetylated nitrosamines.

Thioaminocarbonyl compounds

Contains thioamides, thiocarbamates, and similar thioaminocarbonyl compounds.



Contain esters of parahydroxybenzoic acid.  The alcohol part of the ester consists of a carbon chain with at least two carbons.



Contains aliphatic hydrocarbons and aromatic compounds often in complex mixtures.



Contains esters of phthalic acid.


Other compounds

Heterocyclic compounds

Contains heterocyclic compounds.


Contains organophosphorus compounds and their derivatives.


Contains organosilicones.


All other substances not fitting in any other group.