Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Physical state

Methylenebis (dibutyldithiocarbamate) is a pale amber, slightly viscous liquid.

 

Melting / freezing point

Key study:

The melting temperature (glass transition) of Methylenebis (dibutyldithiocarbamate) was -40°C (233K) (WIL Research, 2012).

 

Boiling point

Key study:

Reaction and/or decomposition of Methylenebis (dibutyldithiocarbamate) was observed at temperatures of > 250°C (> 523K) (WIL Research, 2012). Boiling of Methylenebis (dibutyldithiocarbamate) was not observed below the temperature at which reaction and/or decomposition started. Based on this, Methylenebis (dibutyldithiocarbamate) has no boiling temperature.

 

Relative density

In an in-house study, the relative density of Methylenebis (dibutyldithiocarbamate) is 1.06.

 

Granulometry

Section 4.1 'General observations', identifies the substance as a liquid. According to Column 2 of Annex VII of the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislation, a particle size distribution study does not need to be conducted if the substance is marketed or used in a non solid or granular form. Methylenebis (dibutyldithiocarbamate) is placed upon the EU market as a liquid, therefore, this endpoint has been waived.

 

Vapour pressure

Key study:

The vapour pressure of Methylenebis (dibutyldithiocarbamate) at 20°C (293K) and 25°C (298K) were <1.3E-08 Pa and <1.7E-08 Pa respectively (WIL Research, 2012).

 

Partition coefficient n-octanol/water

Key study:

The LogPow of Methylenebis (dibutyldithiocarbamate) is 8.42 at 35(WIL Research, 2012).

 

Water solubility

Key study:

Preliminary test: The preliminary estimate of water solubility was 5.55E-06 g/L.

Definitive test: The mean concentration of Methylenebis (dibutyldithiocarbamate) in the sample solutions is 0.243 mg/L at 20°C ± 0.5, range of 6.16E-05 to 3.16E-04 g/L (Safepharm, 2003).

 

Surface tension

The substance water solubility is 0.243 mg/l at 20°C. According to Column 2 of Annex VII of the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislation, surface tension study does not need to be conducted if the water solubility is below 1 mg/L at 20 °C. The water solubility of Methylenebis (dibutyldithiocarbamate) is 0.247 mg/l, therefore this endpoint has been waived.

 

Flash point

The flash-point of Methylenebis (dibutyldithiocarbamate) is 192°C (WIL Research, 2012).

 

Autoflammability / self-ignition temperature

According to Column II, Annex VII of the European Union (EU) Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) Regulation (EC) No 1907/2006 an auto-ignitition study can be waivered if the melting point of the substance is <160°C. Methylenebis (dibutyldithiocarbamate) has a melting point of -40°C, and therefore, this study can be waived.

Flammability

According to Column 2 of Annex VII of the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislation, a particle size distribution study does not need to be conducted if the substance does not contain any groups that would indicate flammability. Upon analysis of the test substance Methylene bis(dibutyldithiocarbamate) structure, it does not contain any groups that would indicate the substance is flammable, therefore, the flammability study has been waived.

 

Explosive properties

In the key study (WIL Research, 2012), Methylenebis (dibutyldithiocarbamate) has no explosive properties.

 

Oxidising properties

In the key study (WIL Research, 2012), Methylenebis (dibutyldithiocarbamate) has no oxidizing properties.

 

Stability in organic solvents and identity of relevant degradation products

Upon review of the substance there is no critical stability concerns. According to Column 1 of Annex IX of the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislation, stability in organic solvents and identity of relevant degradation products study does not need to be conducted if the substance stability is not considered critical. The stability of Methylenebis (dibutyldithiocarbamate) is not a concern, therefore this endpoint has been waived.

 

Dissociation constant

According to Column 2 of Annex IX of the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislation, dissociation constant study does not need to be conducted if it is scientifically not possible to perform the test for instance if the analytical method is not sensitive enough; the water solubility of Methylenebis (dibutyldithiocarbamate) is 0.247 mg/l, therefore this study has been waived.

 

Viscosity

In an in-house study, the viscosity of Methylenebis (dibutyldithiocarbamate) is 13.83 cm3/s (1383 cSt).