Monophosphothiamine

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 Jan - 30 Jan 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

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

Version / remarks:

adopted in 2008

Deviations:

no

GLP compliance:

no

Specific details on test material used for the study:

Storage conditions: Ambient temperature (10 to 30 °C), dry

Contact with:

powdered cellulose

Sample tested:

other: test item and cellulose 2:1

Parameter:

preliminary test

Remarks on result:

mixture does not ignite and burn

Remarks:

Tested 3 times

Sample tested:

other: barium nitrate and cellulose 2:1

Parameter:

preliminary test

Remarks on result:

other: 3 test mixtures burned down completely in 68, 68 and 65 s

Sample tested:

reference mixture as specified

Remarks:

barium nitrate and cellulose with different wt. % oxidizer (barium nitrate)

Parameter:

maximum burning rate

Result:

1.79 mm/s

Remarks on result:

other: result found for mixture with 55 wt. % oxidzer

Sample tested:

test mixture as specified

Parameter:

burning time of reaction over a distance of 200 mm

Remarks on result:

other: test mixture extinguished in the preliminary burning phase

Results
Preliminary Test
Three test mixtures with the test item and cellulose 2:1 could not be ignited. It melted and charred in contact with the ignition source. Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 68 s, 68 s and 65 s. respectively.

Main Test
Four tests were performed for the reference mixture (barium nitrate and cellulose) with different wt. % oxidizer (barium nitrate), see Table 1.

Table 1 – Burning times and rates of reference mixtures

Barium nitrate [wt. %]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	132	1.51
55	112	1.79
60	118	1.70
70	179	1.12

 

The highest burning rate of 1.79 mm/s was found for the mixture with 55 wt. % oxidizer.

Mixtures of the test item with cellulose were prepared in between 10 and 90 wt. % of the test item and tested (Table 2).

Table 2 - Burning times and rates of test item mixtures

Test item [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	Test mixture extinguished in the preliminary burning phase	---
20
30	Test mixture could not be ignited, local charring in contact with ignition source
60
90	Test mixture showed melting and charring in contact with ignition source

 

Due to the fact that the maximum burning rate of the mixture of the test item with cellulose showed no burning rate over the complete distance, the 3 most vigorous mixtures (10, 20 and 30 wt. % of the test item) were repeated twice to verify their behavior (Table 3).

Table 3 – Burning times and rates of fastest test item mixtures

test	t [s]	v [mm/s]	t [s]	v [mm/s]	t [s]	v [mm/s]
10 %	Test mixture extinguished in the preliminary burning phase
20 %
30 %	Test mixture could not be ignited, local charring in contact with ignition source

 

Each mixture was measured 3 times, no burning rate could be determined. Therefore, the maximum burning rate of the mixtures of test item and cellulose can be evaluated as lower than that of the reference mixture of cellulose and barium nitrate (1.79 mm/s).

Conclusion: The test item has no oxidizing properties.

Description of key information

Non oxidizing solid (EU Method A.17.)

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

The maximum burning rate of test item and cellulose mixture was slower than that of the reference mixture of barium nitrate and cellulose 2:1 (1.79 mm/s).

Justification for classification or non-classification

The available data on oxidizing properties of the test substance do not meet the criteria for classification according to Regulation (EC) 1272/2008 or Directive 67/548/EEC, and are therefore conclusive but not sufficient for classification: The maximum burning rate of the test mixture was less than that of the reference mixture (barium nitrate and cellulose 2:1) in a test according to the EU method A.17.