Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Justification for type of information:
Read-across justification: There is a mechanistic reasoning to the read-across. The substance is hydrolytically unstable. When it comes in contact with water or moisture complete hydrolysis will take place with no significant reaction products other than the particular alcohol and hydrated titanium dioxide. This rapid hydrolysis (hydrolysis half-life <3 minutes to < 2 hours) is the driving force for the fate and pathways of the substance. Because of rapid hydrolysis some physicochemical properties (water solubility and octanol-water partition coefficient) are not technically feasible to be tested for the target substance. Additionally, because of the reactivity vapour pressure determination was not technically feasible for the target substance. However, as these are relevant properties in exposure assessment, read-across from the physicochemical properties of degradation products are used as key values in the CSA. As target substances will react during the use applications forming other substances and releasing alcohols, the physicochemical properties of the degradation products (alcohols) are used as a key value in the exposure assessment.
Reason / purpose:
read-across source
Guideline:
other: not mentioned
Principles of method if other than guideline:
No method desription available as value is obtained from a handbook.
GLP compliance:
not specified
Type of method:
other: value obtained from handbook
Temp.:
20 °C
Vapour pressure:
< 1.333 Pa

Read-across justifications and data matrices are presented in IUCLID section 13.

Conclusions:
Based on the literature, vapour pressure of 2-ethylhexane-1,3-diol is < 1.333 Pa at 20 °C.

Description of key information

The substance decomposes during vapour pressure testing (see evidence WoE 1 done for structurally similair substance). Thus, vapour pressure value of released alcohol, 2 -ethylhexane-1,3 -diol, is used in CSA.

Key value for chemical safety assessment

Vapour pressure:
1.333 Pa
at the temperature of:
20 °C

Additional information

Tetrakis(2 -ethylhexane-1,3 -diolato) titanium is hydrolytically unstable. When it comes in contact with water or moisture, a complete hydrolysis will take place with no significant reaction products other than 2 -ethylhexane-1,3 -diol (EHD) and hydrated titanium dioxide. Because of rapid hydrolysis, read-across data on the vapour pressure of EHD released from the substance is used as a key value in CSA.