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Stage Main category<br />

Ia Ib Ic II III IV<br />

Production . X X . X .<br />

Formulation . X X . X .<br />

Processing . . . X X X<br />

11. Relationship between industrial categories<br />

APPENDIX I<br />

In practice all chemicals originate from IC 2 & 3 “Chemical industry” <strong>and</strong> go from there to one<br />

of the other ICs (or remain in chemical industry). Substances such as monomers, cross-linking<br />

agents, <strong>and</strong> curing agents take a special position. These substances are basic chemicals (raw<br />

materials) <strong>for</strong> IC 11 “Polymers industry” <strong>for</strong> the production of polymers by polymerisation<br />

reactions <strong>and</strong> other reactions like polyaddition <strong>and</strong> polycondensation. Despite the fact that this<br />

may be seen as the stage of production in IC 3 (UC 33 “Intermediates”) they have been<br />

introduced in the emission tables of IC 11 “Polymers industry” as UC 43 “Process regulators”.<br />

Besides the production of polymers this IC also deals with the processing of the polymers<br />

(thermoplastics) <strong>and</strong> prepolymers (prepolymers are macromolecular substances such as polyester<br />

<strong>and</strong> epoxy resins which are trans<strong>for</strong>med in thermosetting resins with the aid of curing agents,<br />

such as initiators - mainly organic peroxides - <strong>and</strong> cross-linking agents - mainly the monomer<br />

styrene - <strong>for</strong> polyesters, <strong>and</strong> curing agents like amines <strong>for</strong> epoxy resins). The processing stage of<br />

(pre) polymers involves the manufacture of all kind of articles <strong>and</strong> parts of objects from the basic<br />

materials.<br />

The releases in both IC 5 “Personal/domestic” <strong>and</strong> IC 6 “Public domain” have a diffuse character.<br />

In IC 5 the use of chemicals in households is covered <strong>and</strong> in IC 6 the use in offices, public<br />

buildings, parks, railway stations, in the street, etc. The main differences will be found in the<br />

amounts (e.g. because of the size of the building) <strong>and</strong> the number of days that emissions occur.<br />

12. History of the A- <strong>and</strong> B-tables<br />

In the development of the quantitative risk assessment system <strong>for</strong> new substances DRANC<br />

(Dutch Risk Assessment System <strong>for</strong> New Chemicals) (Toet et al., 1991; Vermeire et al., 1992)<br />

emission tables were developed <strong>for</strong> a limited number of applications. The applications considered<br />

were textile dyes, photo-chemicals, metalworking fluids, hydraulic fluids, paper-chemicals, <strong>and</strong><br />

intermediates. For these applications so-called use category <strong>documents</strong> were available. Nearly at<br />

the same time PRISEC (PRIority Setting system <strong>for</strong> Existing Chemicals) was developed (Van de<br />

Meent <strong>and</strong> Toet, 1992). For this system emission tables were developed <strong>for</strong> the 15 industrial<br />

categories distinguished at that time in the HEDSET (EC/OECD Harmonised Electronic Data<br />

Set). The emission factors were established by means of expert judgement <strong>and</strong> tended to the<br />

worst-case situation. For the local release estimation tables were supplied containing expert<br />

judgement <strong>for</strong> the order of magnitude of the daily amount of the substances <strong>for</strong> every relevant<br />

stage of the life-cycle on the basis of the tonnage. The ranges of the tonnages were typical <strong>for</strong><br />

substances produced in limited amounts. When the TGD <strong>and</strong> EUSES were developed these<br />

tables were trans<strong>for</strong>med into what are now referred to as the A- <strong>and</strong> B-tables (A-tables with<br />

emission factors <strong>and</strong> B-tables with size of the operation in<strong>for</strong>mation) <strong>and</strong> extended in the<br />

following way:<br />

217

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