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Category name:
LOA category L Resin Oils & Cyclic Dienes

Justifications and discussions

Category definition:
By definition, from the category, these streams have overlapping hydrocarbon compositions, within a defined range, and hence, will have similar properties.
Category description:
Member of this category will have a carbon number distribution that is predominantly C5 – C15 and may contain more than 0.1 % isoprene and/or more than 0.1% benzene or 1,3‐butadiene.
Category rationale:
Category L ‘Resin oils and cyclic dienes’ ‐ Chemical Category Justification

The Resin oils and cyclic dienes category covers hydrocarbons typically produced by the distillation of
products from a steam cracking process. The category contains non‐hydrotreated products (the Resin
Oil products) and two products that are concentrates (1) dicyclopentadiene (DCPD) and (2)
methylcyclopentadiene dimer (MCPD).
By definition, from the category, these streams have overlapping hydrocarbon compositions, within a
defined range, and hence, will have similar properties. It is therefore reasonable to assume that the
components of the category will behave in a reasonably predictable manner, and with respect to
phys‐chem and environmental fate and effect properties read‐across is valid
For mammalian endpoints, the predominant route of exposure will be by inhalation and in those
streams that contain benzene, butadiene and isoprene these will be the major drivers for effects.
For mammalian endpoints, the classification of these streams will be driven by the content of
benzene, 1,3‐butadiene or isoprene when more than 0.1%, by the content of naphthalene when more
than 1%, and by the content of toluene when more than 5%.

1.1.b. Applicability domain (AD) of the category
The category applies to streams with the following PIONA* analysis: predominantly (iso)paraffins,
olefins, naphthenics and aromatics and a carbon number range of predominantly 5‐15, some streams
will contain more than 0.1% isoprene, benzene, 1,3‐butadiene, naphthalene and/or toluene.
Boiling Point –the streams in this category will boil predominantly in the range of 100 ‐ 220⁰C
Specific components (The range entered below is that currently based on received analytical data, it is
not intended to be prescriptive. See section 1.2).
Benzene: <0.1 – 40%
1,3‐butadiene: <0.1 – 1%
Isoprene : <0.1 to 3%
Toluene: up to 15%
Naphthalene: up to 40%
Styrene: up to 40%
48 | P a g e o f 6 5 22 April 2010
C8 Aromatics (xylenes, ethylbenzene): up to 25%
PIONA* :
(iso)Paraffins – up to 50% : C# 4 ‐ 12
Olefins – up to 60% : C# 5 ‐ 15
Naphthenics – up to 90% : C# 5 ‐ 15
Aromatics – up to 100% : C# 5 – 15
*: PIONA refers to a description of the type of hydrocarbons present, paraffins, isoparaffins, olefins,
naphthenics and aromatics. It does not refer to a specific type of analysis or determination.

The substances in this category are UVCBs and as such are considered to be 100% pure. The term
impurity is not relevant for UVCBs, however, substances will be described using the following:
o Known constituents present at 10% or greater (if any), identified by IUPAC name and
EC number/CAS number, indicating typical concentrations and/or concentration

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