White Spirit OELV: Application to Complex Hydrocarbon Mixtures

Through SCOEL SUM/087, the EU’s Scientific Committee on Occupational Exposure Limits recommended an OELV (Occupational Exposure Limit Value, per EN 689) for white spirit — also known as Stoddard solvent or mineral spirits — of 116 mg/m³ (8-hour TWA) and 290 mg/m³ (15-min STEL). At EU level, no binding BOELV or indicative IOELV has been set for white spirit; SUM/087 is SCOEL’s recommendation, used as the EU-level reference in practice. SCOEL also explicitly defines the scope of that OELV as covering all complex C6–C12 hydrocarbon mixtures — not just the four white spirits SCOEL lists (Types 1, 2 and 3, including Stoddard solvent), all of which are now in EU commercial use. That broad applicability is the core of how the OELV is used, with one critical guardrail: components with a lower OELV must not dominate the mixture.

Scope: a group OELV

SCOEL SUM/087 derives the OELV for white spirit as a representative mixture of saturated aliphatic and alicyclic hydrocarbons in the C6–C12 carbon-number range, with 15–20% aromatics and a boiling range of 130–230 °C. The critical effects: minor brain damage (long-term exposure) and mucous-membrane irritation (acute exposure).

That breadth of applicability is not a downstream inference; SCOEL itself states it:

The OEL for white spirit is considered to apply to all complex hydrocarbon mixtures with their main compounds in the range from C6 to C12.

SUM/087 therefore functions as a group OELV covering the entire C6–C12 chemical class — applicable to complex mixtures and individual components alike.

The critical guardrail: lower-OELV components

The C6–C12 scope alone is not enough. A mixture can fall in the right carbon-number range and still contain components with a lower OELV — most notably:

Benzene (C6H6, a Category 1A carcinogen with an OELV orders of magnitude lower than 116 mg/m³)
n-Hexane (C6H14 aliphatic — its metabolite causes nerve damage in the hands and feet, an endpoint the white spirit OELV does not cover; the OELV happens to be only slightly lower)

If such a component dominates or significantly contributes to a mixture, the white spirit OELV no longer protects against the stricter component-level limit. The component’s own OELV takes precedence.

Outside this exclusion, SUM/087 also does not apply without further consideration to substances outside the C6–C12 range — lighter C5 fractions, heavier C13+ kerosenes — or to BTEX-rich aromatic fractions; the further the composition, vapour pressure or specific toxicity deviates from the white spirits actually studied, the less defensible the read-across becomes.

How DOHSBase implements this

In DOHSBase, 550 CAS/EINECS records for C6–C12 hydrocarbon solvents — both complex mixtures and individual components — are linked to SUM/087, either directly or via a read-across. Every read-across record carries:

A particularization field set to “C6–C12 CSE Hydrocarbons”
A remark field capturing both the scope and the exclusion:

Not for substances or mixtures with lower-OELV components (such as benzene and n-hexane). This white spirit (CAS 64742-82-1) OELV may be applied to complex hydrocarbon mixtures consisting predominantly of C6 to C12 compounds.

This makes the basis of every assignment reproducible — auditable both during a risk assessment and during inspections.

Practical recommendation

Apply the hierarchy with nuance. Where a substance-specific OELV exists and is lower than the SUM/087 read-across, it takes precedence — better protection, and legally binding. Where the substance-specific legal OELV is higher, it remains the enforcement floor, but the duty of care argues for using the lower SUM/087 read-across as the working limit in the risk assessment.
Check for lower-OELV or different-endpoint components first. Benzene and n-hexane are the most common pitfalls — both fall in the C6 range chemically, but neither is protected by the white spirit OELV. Benzene’s limit is orders of magnitude lower (carcinogen); n-hexane acts through a metabolic pathway not covered by the SUM/087 derivation. If either is a meaningful component, the mixture OELV does not provide adequate protection.
Document the read-across. In the risk assessment, record that you are applying SUM/087, justify why the composition falls within the C6–C12 class, and confirm the lower-OELV-component check.

References

SCOEL. Recommendation from the Scientific Committee on Occupational Exposure Limits for white spirit (Stoddard solvent), SUM/087. Brussels: European Commission. PDF via ECHA
ECHA — White spirit substance information. echa.europa.eu