Octaphenylcyclotetrasiloxane

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

pyrophoric solids

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 solids

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

2016-11-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)

Version / remarks:

Part III, Section 33.2.1.4

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Key result

Test procedure:

burning rate test: preliminary screening test

Remarks on result:

substance does not ignite and propagate combustion either by burning with flame or smouldering along 200 mm of the powder train within the 2 minutes test period

Preliminary test

 

Experimental conditions

 

Room humidity: About 51%

Room temperature: About 17°C

Atmospheric pressure: 97.8 kPa

Type of test item: Powder

Application of the flame: Until 2 min maximum

Test period: 2 min

 

Assay No. 1

The test item melted during the application of the burner’s flame. Neither ignition nor propagation was observed.

Assay No. 2

The same observations as for the assay No. 1 were recorded.

 

Main test

Taking into account the results obtained during the preliminary test, no main test was performed.

 

Conclusion

In two assays that were part of the preliminary test, the test item melted during application of the burner’s flame. Neither ignition nor propagation was observed

Interpretation of results:

not classified based on GHS criteria

Conclusions:

No ignition nor propagation was observed during a burning rate test using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water

Reference 4

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

other: VDI2263 Part 1

Principles of method if other than guideline:

The study was based on the principles found in VDI2263 Part 1

GLP compliance:

not specified

Key result

Test procedure:

other: Combustibility test

Remarks on result:

other: The substance (as received) melts without catching fire (Rating 1)

Determination of the combustion class (train firing)

Test substance as received

Fire spread	Type of reaction	Combustion rating
No fire spread	Does not catch fire	1
No fire spread	Brief ignition, rapid extinction	2
No fire spread	Local combustion or smouldering at most, slight spread	3
Fire spread	Glows red hot or slow decomposition without flame	4
Fire spread	Burns like a firework, or slow steady burning with flame	5
Fire spread	Very rapid combustion with flame or rapid decomposition without flame	6

 

1) Ignition source – Gas flame. Melts does not catch fire. Rating 1

 2) Ignition source – Si/PbO₂. Melts does not catch fire. Rating 1 

 

Milled substance (<63µm)

Fire spread	Type of reaction	Combustion rating
No fire spread	Does not catch fire	1
No fire spread	Brief ignition, rapid extinction	2
No fire spread	Local combustion or smouldering at most, slight spread	3
Fire spread	Glows red hot or slow decomposition without flame	4
Fire spread	Burns like a firework, or slow steady burning with flame	5
Fire spread	Very rapid combustion with flame or rapid decomposition without flame	6

 

1) Ignition source – Gas flame. Melts does not catch fire. Rating 1

 2) Ignition source – Si/PbO₂. Melts does not catch fire. Rating 1 

 

Interpretation of results:

GHS criteria not met

Conclusions:

In a combustibility study, the substance as received melts and does not catch fire, hence a combustibility rating of 1 was assigned. The result is considered to be reliable.

Description of key information

Flammability: not classified

Key value for chemical safety assessment

Flammability:

not classified

Additional information

The requirement to test the substance for pyrophoricity and flammability in contact with water was waived in accordance with Section 1 of REACH Annex XI, because there is no indication on the basis of structure and experience in use and handling that the substance is pyrophoric (flammable in contact with air) or flammable in contact with water.

In a readily combustible solid study in accordance with UN Test N.1 Method and in compliance with GLP, the substance was observed not to ignite nor propagate combustion either by burning with flame or smouldering along 200 mm of the powder train within the 2 minute test period. Also, in a combustibility study in accordance with the principle of VDI2263 Part 1, the substance as received melts and does not catch fire, hence a combustibility rating of 1 was assigned. The results are considered to be reliable and are used as weight of evidence that the substance is not flammable.

A Minimum Ignition Energy (MIE) of 1-3 mJ was determined for the milled sample (<63 µm, not as supplied) of  the substance using a relevant test method in accordance with BS EN 13821:2002.

Justification for classification or non-classification

The substance is not classified for flammability as no ignition was observed during the study conducted in accordance with UN N.1 Test Method and in a combustion study conducted according to the principle of VDI2263 Part 1.