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Administrative data

Workers - Hazard via inhalation route

Systemic effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
By inhalation
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
By inhalation
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.084 mg/m³
Most sensitive endpoint:
irritation (respiratory tract)
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
6
Dose descriptor:
NOAEC
AF for dose response relationship:
1
Justification:
default assessment factor 1, because the starting point is a NOAEC, Chapter R 8.4.3.1
AF for differences in duration of exposure:
2
Justification:
The assessment factor suggested by the ECHA TGD for exposure duration from subchronic to chronic is 2.
AF for interspecies differences (allometric scaling):
1
Justification:
For an inhalation study already scaled according to the allometric principle, Chapter R 8.4.3.1
AF for other interspecies differences:
1
Justification:
A factor of 2.5 is suggested by the ECHA TGD for remaining interspecies differences, but justified deviations are possible. Rodents like the rat are in general more sensitive compared to humans as the rat's ventilation frequency is higher. Therefore, as a general rule a factor of 1 for remaining interspecies differences provides sufficient protection.
AF for intraspecies differences:
3
Justification:
default assessment factor for workers, adjusted to 3 in line with Chapter 8.4.3.1, because the remaining relevant differences are non metabolic differences and most of these non-metabolic differences should be rather small due to the homogeneousnes of the workers sub-population. The local toxic effects of the substance are not related to metabolic mechanisms because it is simple destruction of the membranes due to the corrosivity of the substance. Therefore the assessment factor was reduced to 3.
AF for the quality of the whole database:
1
Justification:
default assessment factor for good quality of the database, Chapter 8.4.3.1
AF for remaining uncertainties:
1
Justification:
A factor 2.5 is suggested by the ECHA TGD for remaining interspecies differences, but justified deviations are possible. Rodents like the rat are in general more sensitive compared to humans as the rat’s ventilation frequency is higher. Therefore, as a general rule a factor of 1 for remaining interspecies differences provides sufficient protection.
Acute/short term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.16 mg/m³
Most sensitive endpoint:
irritation (respiratory tract)
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
DNEL extrapolated from long term DNEL

Workers - Hazard via dermal route

Systemic effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
high hazard (no threshold derived)
Most sensitive endpoint:
sensitisation (skin)
Acute/short term exposure
Hazard assessment conclusion:
high hazard (no threshold derived)
Most sensitive endpoint:
sensitisation (skin)

Workers - Hazard for the eyes

Local effects

Hazard assessment conclusion:
high hazard (no threshold derived)

Additional information - workers

General Population - Hazard via inhalation route

Systemic effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
DNEL related information

General Population - Hazard via dermal route

Systemic effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)

General Population - Hazard via oral route

Systemic effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
DNEL related information

General Population - Hazard for the eyes

Local effects

Hazard assessment conclusion:
no hazard identified

Additional information - General Population

The use of the substance 2,2,4(or 2,4,4)-trimethylhexane-1,6 -diisocyanate is restricted only to industrial applications.A direct use of this substance is not known. The exposure of consumers to the substance is

unlikely to occur via consumer products, because no consumer product is known to contain this substance. Hence there is no need to derive DNELs for general population (consumers).