4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]diphenol; bisphenol AF

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

oxidising solids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the organic substance contains oxygen or halogen atoms which are chemically bonded only to carbon or hydrogen and hence, the classification procedure does not need to be applied

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
According to REACh Annex VII / column 2, the study does not need to be conducted if the substance is incapable of reacting exothermically with combustible materials, for example on the basis of the chemical structure.
Based on criteria from:
- Regulation (EC) N°1272/2008 (CLP) Annex I, §2.13.4./2.14.4.,
- ECHA endpoint specific guidance on Information Requirements (R.7a, v6.0, July 2017, §R.7.1.13), the structure of the substance contains oxygen and fluorine, but these elements are chemically bonded only to carbon and/or hydrogen (especially not bonded to nitrogen or other oxygen).
Then oxidising properties are unlikely, and the classification procedure shall not apply, no further testing is required.

Reference 2

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

09 August 2017 - 11 December 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met. However, the guideline followed is not relevant for purpose of classification according to CLP criteria.

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Version / remarks:

Regulation (EC) 440/2008 of 30 May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Duration of test (contact time):

>= 228 - <= 343 s

Key result

Sample tested:

test mixture as specified

Remarks:

2:1 ratio of test item to powdered cellulose

Parameter:

preliminary test

Remarks on result:

other: Cellulose mixture burned superficially when being in contact with the flame.

Remarks:

Burning occured at the tip and surface of the cone.

Key result

Sample tested:

reference mixture as specified

Parameter:

maximum burning rate

Result:

2.381 mm/s

Remarks on result:

flaming

Key result

Sample tested:

test mixture as specified

Parameter:

maximum burning rate

Result:

0.913 mm/s

Remarks on result:

other: The mixture burned only superficially (~ 2 mm), the rest of the test item remained unaffected.

Data Evaluation:

The relative standard deviation of each performed six fold determination is ≤ 10 %. The highest burning rate within a run of six tests of a given mixture is relevant for evaluation. The determined maximum burning rate of the sample mixtures is compared with the highest burning rate of the reference mixture. A graph of the highest value of burning rate for each mixture versus the oxidizer concentration is plotted. From the graph the maximum burning rate is taken.

 

Definitions and Units:

Burning time: Reaction time, in seconds, taken for the reaction zone to travel along a pile.

 

Burning rate: Length of the reaction zone divided by the burning time, expressed in millimetres per second.

 

Maximum burning rate: The highest value of the burning rates obtained with mixtures containing 10 to 90 % (w/w) by weight of oxidiser.

 

Highest burning rate: The highest value of the burning rates obtained by a six-fold determination.

 

 

Preliminary Test:

No vigorous reaction was observed. The test item cellulose mixture burned when being in contact with the flame after 5 s ignition time at the tip and surface of the cone. A train test had to be performed.

 

 

Table 4:          Train Test:

Test No.	Burning time after the reaction zone propagated an initial distance of 30 mm	Burning rate
	[s]	[mm/s](1)
1	90	2.222
2*	84	2.381
3	88	2.273
4	94	2.128
5	91	2.198
6	92	2.174
Mean [mm/s]:		2.229
Standard deviation [mm/s]:		0.089
Relative standard deviation [%]:		4.0

(1):     Calculated using the whole length of 200 mm.

*:        Highest determined burning rate of reference mixture within a 6 fold determination.

 

 

Table 5:          Burning rates of sample mixtures containing 10 to 90 % of test item

Mixture of Test item/cellulose	Combustible substance concentration	Burning time after the reaction zone propagated an initial distance of 30 mm	Burning rate
[w/w]	[%]	[s]	[mm/s]^(1)
9/1	10	Not Determined^(2)	uncalculable
8/2	20	343	0.583
7/3	30	282	0.709
6/4	40	269	0.743
5/5	50	323	0.619
4/6	60	286	0.699
3/7*	70	243	0.823
2/8*	80	228	0.877
1/9*	90	237	0.844

(1):     Calculated using the whole length of 200 mm.

(2):     Flame went off before burning the whole length of 200 mm

*:        Mixtures with the highest burning rates.

 

 

Table 6:          Burning rate of a 3/7 (w/w) sample mixtures of test item and cellulose

Mixture of Test item/cellulose	Test No.	Burning time after the reaction zone propagated an initial distance of 30 mm	Burning rate^(1)	Mean burning rate	Standard deviation	Relative standard deviation
[w/w]		[s]	[mm/s]	[mm/s]	[mm/s]	[%]
3/7	1	243	0.823	0.815	0.014	1.7
3/7	2*	241	0.830
3/7	3	252	0.794
3/7	4	243	0.823
3/7	5	245	0.816
3/7	6	249	0.803

(1):     Calculated using the whole length of 200 mm.

*:        Highest determined burning rate of a mixture within a 6 fold determination. This value is reported in the graph provided in the "Illustration (picture/graph)" field below.

 

 

Table 7:          Burning rate of a 2/8 (w/w) sample mixtures of test item and cellulose

Mixture of Test item/cellulose	Test No.	Burning time after the reaction zone propagated an initial distance of 30 mm	Burning rate^(1)	Mean burning rate	Standard deviation	Relative standard deviation
[w/w]		[s]	[mm/s]	[mm/s]	[mm/s]	[%]
2/8	1	228	0.877	0.879	0.019	2.2
2/8	2	234	0.855
2/8	3	230	0.870
2/8	4	228	0.877
2/8	5*	219	0.913
2/8	6	227	0.881

(1):     Calculated using the whole length of 200 mm.

*:        Highest determined burning rate of a mixture within a 6 fold determination. This value is reported in the graph provided in the "Illustration (picture/graph)" field below.

  

Table 8:          Burning rate of a 1/9 (w/w) sample mixtures of test item and cellulose

Mixture of Test item/cellulose	Test No.	Burning time after the reaction zone propagated an initial distance of 30 mm	Burning rate^(1)	Mean burning rate	Standard deviation	Relative standard deviation
[w/w]		[s]	[mm/s]	[mm/s]	[mm/s]	[%]
1/9	1	237	0.844	0.839	0.008	0.9
1/9	2	240	0.833
1/9	3*	236	0.847
1/9	4	237	0.844
1/9	5	239	0.837
1/9	6	242	0.826

(1):     Calculated using the whole length of 200 mm.

*:        Highest determined burning rate of a mixture within a 6 fold determination. This value is reported in the graph provided in the "Illustration (picture/graph)" field below.

Interpretation of results:

study cannot be used for classification

Remarks:

Reference mixtures used in EU A17 differ from UN O1 guideline, which is the new reference for classification according to GHS/CLP. Therefore the study cannot be used directly for classification purpose. However, it supports the lack of oxidising potential.

Conclusions:

The test item is not an oxidising solid according to Directive 67/548/EEC criteria (now repealed).

Executive summary:

EU Method A.17. –  The oxidising properties of the test item were determined using a procedure designed to be compatible with Method A.17., Oxidising Properties (Solids), of Commission Regulation (EC) No 440/2008 of 30 May 2008.

 

Following a preliminary test, test item mixtures (consisting of 10 to 90 % weight of test item to cellulose in 10 % increments) and a reference mixture (60 % weight of dried barium nitrate and 40 % weight of the sieved and dried powdered cellulose) were prepared.  Each mixture was filled in the mould prescribed by the guideline.  After dropping the mould once from a height of 2 cm onto a solid surface, the remaining excess of substance was scraped off. A non-combustible, non-porous and low heat-conducting base plate was then placed on the top of the mould, the apparatus was inverted and the mould was removed.

One end of the pile was ignited by touching with the flame. The time of reaction over a distance of 200 mm was measured after the reaction zone has been propagated an initial distance of 30 mm. The test was performed six times with the reference mixture and at least once with each one of the sample mixtures.  The test was repeated five times for the three sample mixtures which had the shortest burning time.

In all tests performed, the maximum burning rate of the test item mixtures was determined to be below the determined highest burning rate of the reference mixture.

 

The test item cannot be categorised as an oxidiser under A17 test conditions.

Description of key information

Oxidising Properties: Not oxidising (waiver + EU A.17.; C Bär (2017))

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

Based on chemical structure, no critical bond with O and F atoms associated with oxidising properties was identified, which exempts for further testing according to CLP requirements.

Nevertheless, a full test according to previous Directive 67/548/EEC 'DSD' requirements (EU Method A.17.) is also available:

Following a preliminary test, test item mixtures (consisting of 10 to 90 % weight of test item to cellulose in 10 % increments) and a reference mixture (60 % weight of dried barium nitrate and 40 % weight of the sieved and dried powdered cellulose) were prepared.  Each mixture was filled in the mould prescribed by the guideline.  After dropping the mould once from a height of 2 cm onto a solid surface, the remaining excess of substance was scraped off. A non-combustible, non-porous and low heat-conducting base plate was then placed on the top of the mould, the apparatus was inverted and the mould was removed.

One end of the pile was ignited by touching with the flame. The time of reaction over a distance of 200 mm was measured after the reaction zone has been propagated an initial distance of 30 mm. The test was performed six times with the reference mixture and at least once with each one of the sample mixtures.  The test was repeated five times for the three sample mixtures which had the shortest burning time.

In all tests performed, the maximum burning rate of the test item mixtures was determined to be below the determined highest burning rate of the reference mixture.

This supports the lack of oxidising potential.

Justification for classification or non-classification

The substance fulfills the Regulation (EC) No 1272/2008 (CLP) exemption criteria, therefore no further testing is required, and it is NOT classified as an oxidising solid.