Dichlorocyclohexylmethylsilane

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

pyrophoric liquids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Reference 2

Endpoint:

flammable liquids: obsolete as covered by section 'Flash point'

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is a liquid

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012-04-06

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The study was conducted in accordance with a relevant test method but not in compliance with GLP.

Qualifier:

according to guideline

Guideline:

EU Method A.12 (Flammability (Contact with Water))

Deviations:

no

GLP compliance:

no

Other quality assurance:

other: ISO 9001:2008

Key result

Test procedure:

step 1

step 2

step 3

step 4

other: The maximum rate of gas evolved after 7 hours in three tests was less than 1 L / (kg h). The initial expansion of gas was caused by the exothermic reaction with the release of hydrogen chloride gas.

Max. rate of gas release:

0.38 L/kg h

Identity of evolved gas:

as specified:

Remarks:

HCl

RESULTS

Step 1: Test

Sample weight = 0.02 g

No Gas evolved

No Ignition of gas

 

Step 2: Test

Sample weight = 0.02 g

No Gas evolved

No Ignition of gas

 

Step 4: Test 1, Test 2, Test 3

Sample weight [g] 10,16g, 10,21g, 10,06g

Rate of gas evolution [ml] per hour interval after initial addition of 20 ml water

  in the 1st hr 18,8ml, 20,6ml 12,6ml

  in the 2nd hr - 8,2ml - 8,8ml - 5,8ml

  in the 3rd hr - 3,2ml - 3,2ml - 6,1ml

  in the 4th hr - 1,7ml - 2,3ml 0,5ml

  in the 5th hr - 0,7ml - 1,1ml 0,1ml

  in the 6th hr - 0,9ml - 1,3ml 0,7ml

  in the 7th hr - 0,2ml - 0,8ml - 0,2ml

Total quantity of gas [ml] 3,9ml, 3,1ml, 1,8ml

 

Total time of gas evolution [h] 7 hours

 

Average rate of gas evolution 0,055 l/(kg.h) 0,043 l/(kg.h) 0,026 l/(kg.h)

 

Room temperature 20.7–22.3°C 20.7–22.3°C 20.3–22.0°C

The average rate of gas evolution is clearly less than 1 L / (kg h) in each of the 3 tests in step 4. The maximum rate of gas evolution is not directly applicable. After mixing the test substance with water there is a spontaneous and exothermic reaction. The test substance

hydrolyses under the formation of HCl and the temperature increases (see hydrolysis), so that the surface of the reaction vessel becomes very hot. This is the reason of a thermal expansion of the head space which has a strong influence on the volumetric measurement (increasing volume). In the following measurements (after the next hours and the end of the reaction) the temperature decreases gradually and causes also decreasing gas volumes.

Conclusion:

The maximum rate of gas evolution in 1 h cannot be higher than the measured total quantity of gas after 7 h. The total quantity in 7 h as a maximum rate of gas evolution is clearly less than 1 L / (kg h) in each of the 3 tests: Test 1: 0.38 L / (kg h). Test 2: 0.30 L / (kg h).

Test 3: 0.18 L / (kg h).

Interpretation of results:

not classified based on GHS criteria

Conclusions:

The maximum rate of gas evolution in 1 h cannot be higher than the measured total quantity of gas after 7 h. The total quantity in 7 h as a maximum rate of gas evolution is clearly less than 1 L / (kg h) in each of the 3 tests:
Test 1: 0.38 L / (kg h).
Test 2: 0.30 L / (kg h).
Test 3: 0.18 L / (kg h).

Executive summary:

The experiments according to EC test guideline A.12 showed that the maximum rate of gas evolved after 7 hours in three tests was less than 1 L / (kg h). The initial expansion of gas was caused by the exothermic reaction with the release of hydrogen chloride gas.

Description of key information

Flammability: Not flammable

Key value for chemical safety assessment

Flammability:

not classified

Additional information

The flammability study is not required for liquids as flammability is assessed on the basis of flash point.

There is no indication on the basis of structure and experience in handling and use that the substance is pyrophoric (flammable in contact with air).

Therefore, in accordance with Section 1 of REACH Annex XI, there is no need to conduct further flammability testing.

The flammability in contact with water of the substance was assessed in accordance with EU Method A.12. During the study, the substance was observed to hydrolyse after mixing with water, forming HCl gas with an increase in temperature. At the end of the reaction/study, the temperature gradually decreases with a corresponding decrease in the volume of the gas. Therefore, under the condition of the study, the substance is considered not flammable in contact with water.

There is no concern regarding flammability in contact with air based on experience in handling and use.

Justification for classification or non-classification

The substance is not classified for flammability according to Regulation (EC) No. 1272/2008. This is on the basis of a measured flash point of 76°C and a boiling point of 206°C. Similarly, the substance is not classified for flammability in contact with water on the basis of measured result in accordance with EU Method A.12.