1,3-Propanediol, 2,2-bis(hydroxymethyl)-, polymer with 2-(chloromethyl)oxirane, 2-propenoate

Toxicological Summary

Workers - Hazard via inhalation route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

2.2 mg/m³

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

30

Modified dose descriptor starting point:

NOAEC

Value:

66.1 mg/m³

Explanation for the modification of the dose descriptor starting point:

Inhalation systemic long term. Route-to-route extrapolation: NOECcorr=NOAEL oral*(1/0.38 m³/kg/d)*(ABSorl-rat/ABSinh-human)*(6.7 m³ (8h/10 m³ (8h) 0 75 mg/kg/d*(1/0.38 m³/kg/d)*(0.5*1)*0.67=66.1 mg/m³. It is assumed that oral absorption rate in 50% of that of inhaltion adsorption. ABSoral/rat=oral adsorption rate in rats, ABSinh./human=inhalation absorption rate in humans.

AF for dose response relationship:

1

Justification:

NOAEL was used as starting point

AF for differences in duration of exposure:

6

Justification:

DNEL based on an oral 28-day exposure study in rats

AF for interspecies differences (allometric scaling):

1

Justification:

Already considered during route to route extrapolation.

AF for other interspecies differences:

1

Justification:

Besides the applied allometric scaling factors no additional interspecies factor for remaining differences has been used. In the oral repeated dose study, no specific systemic effects were observed. The primary effect was local irritation. No additional interspecies differences are expected for this effect. In addition rodents like the rat are in general more sensitive compared to human. Anatomical differences as well as air flow patterns between rodents and humans have to be taken into account. Within the ERASM project, studies in rats and mice were being examined. The results suggest that a factor of 2.5 for 'remaining‘ interspecies differences may be questionable as a default value (Escher and Mangelsdorf, 2009; Batke et al, 2011; Bitsch et al, 2006).

AF for intraspecies differences:

5

Justification:

default factor for workers

AF for the quality of the whole database:

1

Justification:

GLP guideline study

AF for remaining uncertainties:

1

Justification:

default factor

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Workers - Hazard via dermal route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

0.625 mg/kg bw/day

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

120

Modified dose descriptor starting point:

NOAEL

Value:

75 mg/kg bw/day

Explanation for the modification of the dose descriptor starting point:

Same rate of absorption was assumed after dermal and oral exposure.

AF for dose response relationship:

1

Justification:

NOAEL was used as starting point

AF for differences in duration of exposure:

6

Justification:

DNEL based on an oral 28-day exposure study in rats

AF for interspecies differences (allometric scaling):

4

Justification:

This factor describes the differences in metabolic rate between rats and humans based on body weight and is generally applicable to renally excreted substances.

AF for other interspecies differences:

1

Justification:

Besides the applied allometric scaling factors no additional interspecies factor for remaining differences has been used. In the oral repeated dose study, no specific systemic effects were observed. The primary effect was local irritation. No additional interspecies differences are expected for this effect. In addition rodents like the rat are in general more sensitive compared to human. Anatomical differences as well as air flow patterns between rodents and humans have to be taken into account. Within the ERASM project, studies in rats and mice were being examined. The results suggest that a factor of 2.5 for 'remaining‘ interspecies differences may be questionable as a default value (Escher and Mangelsdorf, 2009; Batke et al, 2011; Bitsch et al, 2006).

AF for intraspecies differences:

5

Justification:

default factor for workers

AF for the quality of the whole database:

1

Justification:

GLP guideline study

AF for remaining uncertainties:

1

Justification:

default factor

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

medium hazard (no threshold derived)

Most sensitive endpoint:

sensitisation (skin)

Acute/short term exposure

Hazard assessment conclusion:

medium hazard (no threshold derived)

Most sensitive endpoint:

sensitisation (skin)

Workers - Hazard for the eyes

Local effects

Hazard assessment conclusion:

no hazard identified

General Population - Hazard via inhalation route

Systemic effects

Acute/short term exposure

DNEL related information

Local effects

Acute/short term exposure

DNEL related information

General Population - Hazard via dermal route

Systemic effects

Acute/short term exposure

DNEL related information

General Population - Hazard via oral route

Systemic effects

Acute/short term exposure

DNEL related information

Additional information - General Population

As there are no consumer uses, no consumer DNELs were derived.