Propane-1,3-diol

Endpoint summary

Additional information

The test substance (CAS No. 504-63-2) is liquid with a freezing point of -24.6ºC and a boiling point of 208.9ºC using ASTM D1120-94 2004.

In accordance with REACH Annex VII, the density of 1,3-propanediol was measured relative to water to give a relative density of 1.05 at 25°C using USP <841> Method 1. The vapour pressure was determined to be 3.91 Pa at 25°C (calculated using MPBPVP v. 1.43). The log Kow is -0.71 at 25°C (calculated using KOWWIN v. 1.67). Supporting documentation for these calculations is documented using the QSAR Prediction Reporting Format (QPRF) version 1.1, May 2008 and the Q(SAR) model is documented in a QMRF.   The surface tension is 74.161 mN/m. The water solubility is >1000 g/L in distilled water.

In accordance with REACH Annex VII, the flash point was measured and determined to be > 99°C using method ASTM Method D56 (Tag Closed Cup). In accordance with section 1 of REACH Annex XI, information requirement section 7.10, a flammability study does not need to be conducted because for liquids the primary value for ease of ignition is the flash point. According to ECHA Chapter 7 guidance the flammability is deduced from flash point. The test substance is classified as a Class IIIB combustible liquid due to a flash point greater than 93.4°C. In accordance with Section 2 of REACH Annex XI, information requirement section 7.10, additional flammability studies do not need to be conducted because based on chemical structure pyrophoricity or water reactivity is not to be expected. According to ECHA Chapter 7 guidance, experience in handling and use provides sufficient information to indicate that this substance is not pyrophoric or water reactive.

In accordance with Column 2 adaptation statement of REACH Annex VII, information requirement section 7.11 explosivity testing does not need to be conducted based on a structural assessment of the substance. Examination of the structure indicates that there are no groups associated with explosive properties. Therefore, negative results can be predicted and no testing for explosive properties has been carried out.  The self-ignition temperature is 342°C as determined by ASTM Method E659-78 (Reapproved 2005). In accordance with Column 2 adaptation statement of REACH Annex VII, information requirement section 7.13, a study on oxidising properties does not need to be conducted based on structural assessment of the substance. The test substance contains no oxidising groups and all oxygen atoms are bonded directly to carbon atoms. In accordance with Column 2 adaptation statement of REACH Annex VII, information requirement section 7.14, granulometry does not need to be conducted for liquids or gases. In accordance with Column 2 adaptation statement of REACH Annex IX, information requirement section 7.15, the stability in organic solvents does not need to be assessed since it is not considered critical. This would be assessed in individual studies where organic solvents are used. In accordance with Section 2 of REACH Annex XI, information requirement section 7.16,a dissociation study does not need to be conducted as the test substance has no dissociable groups. According to ECHA Chapter 7 guidance, measurement of pKa is irrelevant as the substance cannot dissociate due to a lack of relevant functional groups. The viscosity of the test substance is 44.923 mm²/s (cSt) at 24°C.

 

For details on references see the IUCLID dataset.