Symclosene

Explosiveness

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study is not a true explosivity study but provides suopporting information to show that TCCA does not possess explosive properties.

Principles of method if other than guideline:

Intermediate scale burn tests were performed on both TCCA granules and tablets

GLP compliance:

no

Parameter:

other: Explosive under influence of flame

Remarks:

migrated information

Remarks on result:

negative (not further specified)

The key physical 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 (i.e. less the burner). Table 1 summarizes the data.

Table 1: Intermediate scale fire exposure test data

Material	Initial total mass (kg)	Peak HRR conv	Peak HRR CO2	Peak radiant 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

Conclusions:

During the tests there was no indication of any explosive effects. The cases of bottles or the pails simply burned. Based on the outcome of these tests TCCA is not considered to be explosive.

Reference 2

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study is not a true explosivity study but shows that here was no indication of any explosive behavior during the burn tests. The information is used as supporting information for the explosivity endpoint.

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.

GLP compliance:

no

Parameter:

other: Explosive under influence of flame

Remarks:

migrated information

Remarks on result:

negative (not further specified)

The results showed little to no enhancement of the burn rate (Rate of Heat Release) of the combustible packing materials and wood crib exposure fire by either the granular or tableted Trichlor.

Interpretation of results:

non explosive

Remarks:

Migrated information

Conclusions:

There was no significant increase in the overall burn rate of the ordinary combustibles (the pails and the pallets) when TCCA was present and therefore TCCA should be classified as a Class 1 Oxidizer (the lowest hazard level). While the focus of the burn test was on the oxidizer classification, there was no indication of any explosive behavior during these burn tests.

Description of key information

In two large scale burn tests it was found that TCCA does not significantly increase the burning rate of the packaging under a fire situation and showed no evidence of any explosive behavior.

Additional information

Two larger scale burn tests are available which provide data on the explosivity properties of TCCA. Intermediate scale burn tests were performed on both TCCA granules and tablets (Buc 2009). The burn tests were conducted on packages typical of commercial products  The cases of bottles or the pails simply burned. A report on a modified UN 6(c) burn test (Safety Engineering Labs 1994) concluded that there was no significant increase in the overall burn rate of the ordinary combustibles (the pails and the pallets) when TCCA was present and therefore TCCA should be classified as a Class 1 Oxidizer (the lowest hazard level). While the focus of the burn test was on the oxidizer classification, there was no indication of any explosive behavior during these burn tests.

 

Justification for classification or non-classification

In two large scale burn tests it was found that TCCA does not significantly increase the burning rate of the packaging under a fire situation and showed no evidence of any explosive behavior. TCCA should therefore not be classified as an explosive.