Symclosene

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

oxidising properties

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

Safety Engineering Laboratories, Inc (SEL) contracted with the Chemical Manufacturers Association Chlorinated Pool Chemicals Panel (CMA) performed Trichlor storage fire tests. The purpose of the tests was to identify the differences in exposure fire performance between granular and tableted Trichloroisocyanuric acid (Trichlor) and provide baseline information with respect to the classification of solid oxidizers based on the increase in burning rate of combustibles in the fire.

Interpretation of results:

other: oxidising

Remarks:

Migrated information

Conclusions:

There was no observed significant increase in the overall burn rate of the ordinary combustibles (polyethylene and wood) in any of the Trichlor tests therefore the materials should be categorized according to NFPA definitions as a Class I oxidizer rather than a Class II oxidizer.

Reference 2

Endpoint:

oxidising properties

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

Bench scale and Intermediate scale burn tests were performed on both TCCA granules and tablets. The bench scale burn test is an enhanced version of the UN O.1 Test for Solid Oxidizers and the intermediate scale burn test was performed at the 24 or 48 lb (10.9 or 21.8 kg) scale in commercial packaging

Contact with:

powdered cellulose

The key physical indicators of burning rate from the screening test were mass loss rate and burning time calculated from the mass data. The key indicators of burning rate from the intermediate-scale test were peak convective heat release rate (Peak HRR conv) and the active burning time calculated from the radiant heat flux profile of the packaged test material (ie less the burner).

Table 1 summarizes the intermediate-scale fire exposure test data.

Table 1: Intermediate scale fire exposure test data.

Material	Initial total mass (kg)	Peak HRR conv	Peak HRR CO2	Peak radiant heat flux (upper sensor)	Peak radiant heat flux (lower sensor)	Active burning time	Mass loss rate	Mass loss	Peak surface temperature	Peak temperature at bottom	Peak temp inside pkg
	kg	kW	kW	kW/m^2	kW/m^2	s	Kg/min	%	C	C	C
6 x 4 lb HDPE bottles (net weight of TCCA = 24 lb total)
TCCA (3 inch tablets)	12.14	38	101	1.66	1.97	230	0.42	22	655	108	531
TCCA (1 inch tablets)	12.27	39	86	1.51	1.63	320	0.36	36	618	101	812
6 x 4 lb HDPE bottles (net weight of TCCA = 24 lb total)
TCCA (granular)	12.14	55	92	2.28	2.34	208	0.43	35	589	66	432
2 x 24 lb pails (net weight of TCCA = 48 lb total)
TCCA (tablets)	24.50	21	49	1.25	1.23	440	0.34	16	461	235	279

 

Interpretation of results:

other: oxidising

Remarks:

Migrated information

Conclusions:

The results of the bench scale test, which is similar to the A.17 test, indicate that TCCA is an oxidizer. In intermediate scale burn tests, the active burning time of TCCA was 3 minutes or longer and TCCA did not cause a visual increase in the burning rate of the combustible test packaging. Therefore, TCCA should be categorized according to the proposed criteria and the NFPA definitions as a Class 1 oxidizer.

Reference 3

Endpoint:

oxidising solids

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.17 (Oxidising Properties (Solids))

GLP compliance:

yes

Sample tested:

reference mixture as specified

Parameter:

maximum burning rate

Result:

1.08 mm/s

Remarks on result:

other: Reference mixture (barium nitrate and cellulose). Highest burning rate with 55 wt-%

Sample tested:

test mixture as specified

Parameter:

maximum burning rate

Result:

3.5 mm/s

Remarks on result:

other: 70% of test item with cellulose

Sample tested:

reference mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

0.65 other: mm/s (migrated information)

Remarks on result:

other: Barium nitrate in an inert atmosphere (argon)

Sample tested:

test mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

2.56 other: mm/s (migrated information)

Remarks on result:

other: Test substance in an inert atmosphere (argon)

Table 1: Reference mixture (barium nitrate and cellulose) with 40, 50, 55, 60 and 70 wt-% oxidizer (barium nitrate):

Barium nitrate [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
40	402	0.50
50	260	0.77
55	185	1.08
60	254	0.79
70	430	0.47

Table 2: Mixtures of test item with cellulose:

Test item [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
10, 20, 30	No tests were performed due to the fact that a mixture with 40 wt. -% test item could not be ignited with a flame	--
40	The test item could not be ignited with a flame	--
50	322	0.62
60	114	1.75
65	71	2.82
70	57	3.50
80	242	0.83
90	The test item could not be ignited with a flame, the test item melted	--

Table 3: Mixtures with kieselguhr

Test item [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
55	The test item could not be ignited with a flame, no reaction was observed	--
Barium nitrate [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
55	The barium nitrate could not be ignited with a flame, no reaction was observed	--

Table 4: Mixtures in an inert dry atmosphere (Argon)

Test item [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
70	78	2.56
Barium nitrate [wt. - %]	Burning time over 200 mm [s]	Burning rate [mm/s]
55	307	0.65
60	355	0.56

Interpretation of results:

Category 2 (oxidising solids) based on GHS criteria

Conclusions:

Trichloroisocyanuric acid is oxidizing

Description of key information

Three studies are available which demonstrate that TCCA is an oxidizer.

Key value for chemical safety assessment

Oxidising properties:

oxidising

Additional information

The key study is an oxidizing study which was performed according to EU Method A17 (Smeykal 2007). TCCA was oxidizing in this test.

Two further studies are available as supporting information which categorize TCCA as an oxidizer according to the National Fire Protection Association (NFPA) criteria.

The 1994 SEL report concluded that at worst TCCA should be categorized as a Class I oxidizer, which is defined by NFPA as 'An oxidizer that does not moderately increase the burning rate of combustible materials with which it comes into contact'.

Bench scale and Intermediate scale burn tests were performed on both TCCA granules and tablets (Buc 2009). The active burning time of TCCA was 3 minutes or longer. TCCA did not cause a visual increase in the burning rate of the combustible test packaging. The report concluded that TCCA should be categorized according to the proposed criteria and the NFPA definitions as a Class I oxidizer.

Justification for classification or non-classification

TCCA was shown to be an oxidizer in the A17 study and therefore warrants a classification as an oxidizer. For CLP TCCA should be classified as oxidizing category 2 with the hazard statement H272: May intensify fire; oxidizer.