7.1 This section deals with the mixtures defined
in 3.1.4, i.e. those containing one
or more components, forming more than 3% by weight of the mixture,
which have not yet been assessed by IMO and therefore are not listed
in either chapters 17 and 18 of the IBC Code, or
the MEPC circular mentioned in 2.6.
7.2 There are two alternative ways of assessing
.1 If sufficient data are available on the mixture
as a whole, it should be assessed as if it were a pure or technically
pure chemical, as shown in 4.3 to 4.6 and
4.8 to 4.13.
.2 If sufficient data on the mixture as a whole
are not available, the producing or shipping country Administration
should first provisionally assess each unassessed component according
to section 4 and then assess the mixture
by calculation, as shown in 6.2 to 6.6.
7.3 After provisional assessment by tripartite
agreement, pollutant-only mixtures containing unassessed components
will be shipped under one of the 18 "Noxious (or non-noxious) liquid,
n.o.s." generic entries to the IBC Code, without
the need for an amendment sheet to the ship's Certificate of Fitness
and P & A Manual. Such an amendment is instead required for mixtures
with safety hazards (see 3.5).
7.4 Either the proposing Administration or the
manufacturer will forward to GESAMP the available data on the mixture
as a whole in the case of 7.2.1 or on each individual unassessed component
in the case of 7.2.2, in order to start the development of the respective
hazard profiles. This should be done as soon as possible, using the
format reproduced in annex 8.