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Physical & Chemical properties

Explosiveness

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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.14 (Explosive properties)
Version / remarks:
according to the EEC regulation No. 440/2008
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Key result
Parameter:
sensitiveness to impact: impact energy (J)
Remarks on result:
not sensitive to impact using an impact energy of 40 J
Key result
Parameter:
thermal sensitivity - Koenen test: diameter of the orifice plate
Remarks:
6 mm orifice
Value:
6
Number of fragments:
0
Remarks on result:
not thermal sensitive if heated under defined confinement
Key result
Parameter:
thermal sensitivity - Koenen test: diameter of the orifice plate
Remarks:
2 mm orifice
Value:
2
Number of fragments:
0
Remarks on result:
not thermal sensitive if heated under defined confinement

Mechanical shock sensitivity

None of the six single tests with an impact energy of 40 J showed any sparking or exploding. Therefore the test series using impact energies of 7.5 J were not necessary. No impact sensitivity of the test item was observed.

Thermal sensitivity

Using the 6 mm orifice after 73-75 s the start of a reaction was observed in the single tests (yellow coloured flame of about 1.5 m height above the tube and escaping of the test substance). The reaction lasted 65-67 s. After about 170 s the bottom of the steel tubes became glowing red. The burners were turned off after 5 minutes. After cooling down it was observed that all the tubes were unchanged.

Using the 2 mm orifice after 67-69 s the start of a reaction was observed in the single tests (yellow coloured flame of about 1.5 m height above the tube and escaping of the test substance connected with a noisy sound). The reaction lasted 65-66 s. After about 170 s the bottom of the steel tubes became glowing red. The burners were turned off after 5 minutes. After cooling down it was observed that all the tubes were unchanged.

Interpretation of results:
GHS criteria not met
Conclusions:
The substance was reported not to be an explosive hazard, determined in a reliable study conducted according to an appropriate test protocol. No further details are available.

Description of key information

Explosiveness: Non explosive (EU Method A.14)

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

No explosivity data are available for[3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane (CAS 2897-60-1, target substance), therefore reliable data for the analogue substance [3-(2,3-epoxypropoxy)propyl]trimethoxysilane (CAS 2530-83-8, source substance) have been read across.

[3-(2,3-Epoxypropoxy)propyl]trimethoxysilane was found to be not explosive in a reliable standard study conducted in accordance with EU Method A.14. The calculated oxygen balance of [3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane was -193 and that of its structural analogue was -156. The source substance has the smallest negative oxygen balance (greatest potential to show explosive properties) compared to the target substance. Both substances are alkoxysilanes with the same [3-(2,3-epoxypropoxy)propyl side chain. The difference is that the target substance is a diethoxy(methyl)silane and the source substance is a trimethoxysilane. The potential for explosive properties is associated with the epoxide group in the side chain. This group is the same for both the source substance and target substance. The alkoxysilane groups are structurally similar, not associated with explosive properties and remote from the epoxide group. Therefore, it is considered relevant to read-across the negative result from the source substance to the target substance. Further information is in the report attached in Section 13 (PFA 2017).

Reference:

PFA (2017). Analogue Grouping Report: Explosive Properties of Organosilicon Substances Containing a 1,2-epoxide group. Reference: PFA.404.004.001

Justification for classification or non-classification

There is no evidence that the substance should be classified for this endpoint.