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Physical & Chemical properties

Explosiveness

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Description of key information

In accordance with Annex VII column 2 adaptation of REACH, testing for explosiveness of NPEO is not necessary based on the molecular structure of its constituents, i.e. it does not contain any chemical groups associated with explosive properties, as per ECHA guidance Chapter R.7a, Section R.7.1.11.3.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

The explosive properties of NPEO were predicted based on the molecular structure of its constituents, in accordance with ECHA guidance Chapter R.7a, Section R.7.1.11.3.

According to the guidance, when the substance contains chemical groups associated with explosive properties and if oxygen is present in the molecule, the oxygen balance (OB) may be calculated according to the chemical reaction and mathematical equation below (Lothropet al.):

CxHyOz + [x + (y/4) -(z/2) ]. O2 → x CO2 + (y/2) H2O

 using the formula:

 OB = -1600 [2x +(y/2) -z] / molecular weight.

Where: x = Number of carbon atoms; y = Number of hydrogen atoms; z = Number of oxygen atoms

(The number of nitrogen atoms present is neglected.)

If the calculated oxygen balance is less than -200, then testing does not need to be conducted and a negative result can be predicted.

The oxygen balance for the main compound of NPEO is less than -200. Therefore, experimental testing of explosive properties is not necessary and a negative result can be predicted according to the above mentioned REACH guidance. An evaluation according to the guidance criteria indicates that the constituents of NPEO do not have functionality or chemical groups associated with explosivity, or that could imply explosivity.

The explosive properties of NPEO were also predicted according to Appendix 6 of the United Nations’ Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria (Fourth Revised ed., 2003). None of these structural elements can be found in the molecular structures of the individual constituents of NPEO. All the groups within the molecular structure can be considered as thermodynamically stable under a wide range of conditions including exposure to flame, friction or shock.

Justification for classification or non-classification

Based on the molecular structure of the constituents of NPEO, substance is not considered explosive. It therefore does not require classification according to CLP (EC 1272/2008) and DSD (67/548/EEC) criteria.