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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties


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Link to relevant study record(s)

explosive properties of explosives
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance contains chemical groups associated with explosive properties which include oxygen, but the calculated oxygen balance is less than - 200

Description of key information

Explosiveness: not relevant

Key value for chemical safety assessment

non explosive

Additional information

The assessment of explosive properties was conducted using non-experimental methodology. The potential explosive properties of a substance can be determined with acceptable reliability directly from the chemical structure (ECHA 2008). If the substance does not contain any groups associated with explosivity then a negative result is likely to be obtained. Chemical structures for the constituents of TOPP were examined using this approach.

Constituents of TOPP are not expected to present any hazard associated with explosive properties. This statement is supported by the lack of functional groups of concern in the constituents of TOPP. An Oxygen Balance (OB) value of –329 was obtained for the monoterpenes and sesquiterpenes which are the major constituents of TOPP. 

The OB of major constituents of TOPP was determined with the equation below:

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

Using the formula:

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


x = Number of carbon atoms

y = Number of hydrogen atoms

z = Number of oxygen atoms

(The number of nitrogen and other atoms present is neglected.)

Based on lack of functional group of concern in the constituents of TOPP based on structural examination, it can be predicted that testing for explosive properties will be negative; therefore, testing is not conducted for this group of substances.

In accordance with Column 2 of REACH Annex VII, the explosive properties study (required in Section 7.11) does not need to be conducted as there are no chemical groups associated with explosive properties present in the substance.

Justification for classification or non-classification

There is no evidence to suggest that TOPP should be classified for explosive properties.