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- Practical Guide -
Page 49 of 153
4.2.4 Other questions on mixtures and individual components in mixture
Question: If a mixture appears in the EU positive lists, are then the individual components
automatically authorised?
Answer: Not always, because the toxicity of a substance depends on the dose ingested by
the animals examined in the toxicological test. The data obtained for a whole
mixture cannot always be extrapolated to a minor component in this mixture.
Question: If the various components of a mixture are listed individually in the positive list,
are all of their mixtures automatically authorised?
Answer: Yes.
Aids to polymerisation
They are defined as "Substances, which directly influence the formation of polymers" and
constitute a separate class of substances planned to be regulated by specific rules. They
include, for example:
Catalyst deactivators
Catalyst supports
Catalyst modifiers
Chain scission reagents
Chain transfer or extending agents
Chain stop reagents
Cross-linking agents
Initiators and promoters
Molecular weight regulators
Polymerisation inhibitors
Redox agents
Overall migration limits
The restrictions on use of plastic materials and articles are given in Art. 2.
Article 2
Plastic materials and articles shall not transfer their constituents to foodstuffs in quantities exceeding 10 milligrams per square
decimetre of surface area of material or article (mg/dmē) (overall migration limit). However, this limit shall be 60 milligrams of
the constituents released per kilogram of foodstuff (mg/kg) in the following cases:
(a) Articles which are containers or are comparable to containers or which can be filled, with a capacity of not less than 500
millilitres (ml) and not more than 10 litres (1);
(b) Articles which can be filled and for which it is impracticable to estimate the surface area in contact with foodstuffs;
(c) Caps, gaskets, stoppers or similar devices for sealing.