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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-11-23 to 2018-04-24
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: OECD Test Guideline 113 (1981) Screening Test for Thermal Stability and Stability in Air
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1
Version / remarks:
Recommendations on the TRANSPORT OF DANGEROUS GOODS: Manual of Tests and Criteria, 6th edition, New York and Geneva, 2015: Class 1
Class 1 Test series 1/2, Test 1(b)/2(b): Koenen Test
Class 1 Test series 1 / 2, Test 1(c)/2(c): Time Pressure Test
Class 4, division 4.1: Test series F, Test F.3: Trauzl Test
GLP compliance:
no
Specific details on test material used for the study:
Name: tert-Butyl glycidyl ether
CAS No.: 7665-72-7
Batch No.: ZMG-195668
Appearance: Clear colourless liquid
Molecular formula: C7H14O2
Composition: 99.8% (area)
Storage conditions: Room temperature, protected from light
Expiry date: 07 March 2019
Test series:
other: OECD Test Guideline 113 (1981) Screening Test for Thermal Stability and Stability in Air
Method:
other: Differential Scanning Calorimetry
Parameter:
other: Decomposition energy
Result:
other: -810 J/g
Remarks on result:
other: The test item showed a first exothermic effect in the temperature range of 150 - 200 °C (average decomposition energy -60 J/g). A second exothermic effect was observed in the temperature range 340 - 470 °C (decomposition energies of -650 and -810 J/g).
Test series:
UN Test series 1
Method:
UN Test 1 (b): Koenen test
Parameter:
limiting diameter (mm)
Result:
result is considered "-" (negative)
Remarks on result:
other: Test series with a 1.0 mm diameter orifice plate showed no explosion.
Test series:
UN Test series 2
Method:
UN Test 2 (b): Koenen test
Parameter:
limiting diameter (mm)
Result:
result is considered "-" (negative)
Remarks on result:
other: Test series with a 1.0 mm diameter orifice plate showed no explosion.
Test series:
UN Test series 1
Method:
UN Test 1 (c) (i): Time/pressure test
Parameter:
other: Time of pressure rise
Result:
result is considered "-" (negative)
Remarks on result:
p = 2070 kPa: no
Remarks:
No pressure of 690 and 2070 kPa, respectively, was reached.
Test series:
UN Test series 2
Method:
UN Test 2 (c) (i): Time/pressure test
Parameter:
other: Time of pressure rise
Result:
result is considered "-" (negative)
Remarks on result:
p = 2070 kPa: no
Remarks:
No pressure of 690 and 2070 kPa, respectively, was reached.
Test series:
other: Test series F, Test F.3: Trauzl Test
Method:
other: Trauzl test
Parameter:
other: Expansion volume
Result:
result is considered "-" (negative)
Remarks on result:
other: Expansion of 4.0 ml per 10 g test item.

Thermal stability OECD 113

The test item showed a first exothermic effect in the temperature range of 150 - 200 °C, with an average decomposition energy of -60 J/g. A second exothermic effect could be observed in the temperature range of 340 - 470 °C, with decomposition energies of -650 and -810 J/g. At approx. 470 °C a pressure rise was detected. The results of the DSC-measurements are summarized in Table 1.

Table 1: Results of the DSC-measurements

No.

Crucible material

Sample weight / mg

Start of effect / °C

Energy* / J/g

1

Glass

5.48

150

340

-50 (exothermic)

-810 (exothermic)

2

Glass

3.53

160

350

-70 (exothermic)

-650 (exothermic)

*Energies of exothermic effects are presented as negative values and energies of endothermic effects as positive values

Explosive properties UN Class 1

In the DSC measurements the decomposition energy of the exothermic effects was above the threshold of -500 J/g to exclude explosive properties on the basis of the DSC measurements. Therefore, further tests as the Koenen- and the Time-Pressure-test were performed. Since the exothermic energy of one measurement was also above -800 J/g, also the Trauzl-test was performed.

Explosive properties: Thermal Sensitivity (Koenen-Test)

Three tests with a 1.0 mm diameter orifice plate were performed. The results of the test are presented in Table 2.

No.

Sample weight / g

Diameter orifice plate / mm

Reaction time t1 /s

Reaction time t2 /s

Reaction

Appearance of tube

1

23.65

1

15

--

t1: Flame

Unchanged

2

23.60

1

15

--

t1: Flame

Unchanged

3

23.62

1

15

--

t1: Flame

Unchanged

t1: time to first reaction: flame

t2: time to main reaction: no reaction

Due to the fact that the test series with a 1.0 mm diameter orifice plate showed no explosion the UN Transport Regulation Test 1(b) and 2(b) was deemed to be "-".

Explosive properties: (Time-Pressure-Test)

The results of the test are summarized in Table 3.

Table 3: Results of the test

 

Test 1

Test 2

Test 3

Tolerance

Time [s] at 690 kPa

not reached

not reached

not reached

Minimum

Maximum

Time [s] at 2,070 kPa

not reached

not reached

not reached

- 30 %

+ 30 %

Time for pressure rise [s]

-/-

-/-

-/-

-/-

-/-

Due to the fact that the test item did not reach a pressure of 690 and 2070 kPa, respectively, the UN-Transport Regulation Test 1(c) and 2(c) was deemed to be "-".

Explosive properties: (Trauzl-Test)

One test with a test item mass of 9.16 g was carried out. The volume of the enlarged cavity is 3.7 ml. Normalization to 10 g of the test item results in an expansion of 4.0 ml per 10 g. Therefore the UN-Transport Regulation Test F.3 results to be “No”. Based on this the UN Transport Regulation Test 1(a) and 2(a) was deemed to be “-“.

Interpretation of results:
GHS criteria not met
Conclusions:
According to the results of the test on thermal stability and explosive properties the test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation and the test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.
Executive summary:

In a thermal stability test according to OECD test guideline 113 the test item in closed glass crucibles showed a first exothermic effect in the temperature range of 150 - 200 °C, with an average decomposition energy of -60 J/g. A second exothermic effect could be observed in the temperature range of 340 - 470 °C, with a decomposition energy of up to -810 J/g.

In the DSC measurements the decomposition energy of the exothermic effects was above the threshold of -500 J/g which would justify to exclude explosive properties on the basis of the DSC measurements. Therefore, further tests as the Koenen- and the Time-Pressure-test were performed. Since the exothermic energy of one measurement was also above -800 J/g, also the Trauzl-test was performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.

According to the results of the test on thermal stability and explosive properties the test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation and the test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.

Description of key information

In a thermal stability test according to OECD test guideline 113 the test item in closed glass crucibles showed a first exothermic effect in the temperature range of 150 - 200 °C, with an average decomposition energy of -60 J/g. A second exothermic effect could be observed in the temperature range of 340 - 470 °C, with a decomposition energy of up to -810 J/g.

In the DSC measurements the decomposition energy of the exothermic effects was above the threshold of -500 J/g which would justify to exclude explosive properties on the basis of the DSC measurements. Therefore, further tests as the Koenen- and the Time-Pressure-test were performed. Since the exothermic energy of one measurement was also above -800 J/g, also the Trauzl-test was performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.

According to the results of the test on thermal stability and explosive properties the test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation and the test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification