Reaction mass of sodium sulphate and trisodium trioxalatoferrate

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Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Test procedure according to UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria

Qualifier:

according to guideline

Guideline:

other: UN Manual of Tests and Criteria, Part III, N.4

Key result

Relative self-ignition temperature:

> 140 °C

During the entire test (44 hours) the sample temperature was below the oven temperature of 140°C. The maximum sample temperature was 139°C.

Conclusions:

neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C was observed. Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008.

Reference 2

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Remarks:

VDI 2263, part 1

Qualifier:

according to guideline

Guideline:

other: Directive VDI 2263, Part 1

Key result

Relative self-ignition temperature:

>= 200 °C

Remarks on result:

other: This refers to the test substance

Relative self-ignition temperature:

>= 210 °C

Remarks on result:

other: This refers to the test substance/Kieselguhr mixture (1:1)

In the screening test according to Grewer with the pure product an exothermal effect was detected starting at 200 °C. A multistage reaction was observed which led to a maximum product temperature of more than 400 °C.

In the screening test with the kieselgur mixture (1:1) a weak exothermal effect was detected starting at 210 °C. A multistage reaction was observed which led to a maximum product temperature of more than 300 °C

Between 100 and 180°C an endothermal effect was observed.

Conclusions:

Due to the results from the Grewer-Oven Test further studies are necessary to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

Additional information

The self-heating in air was studied in a screening test according to Grewer (Grewer-Oven-Test, VDI 2263, part 1) with the pure test substance and a 1:1 kieselguhr mixture additionally.

In the test with the pure product an exothermal effect was recorded starting at 200 °C. A multistage reaction was observed which led to a maximum product temperature of more than 400 °C. With the kieselgur mixture (1:1) a weak exothermal effect was detected starting at 210 °C. A multistage reaction was observed which led to a maximum product temperature of more than 300 °C.

Due to these results from the Grewer-Oven Screening Test an UN N.4 test according to the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, was conducted in order to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

In this higher tier study the test item was placed in a cube-form sample container of stainless steel. wire netting (edge length 10 cm, defined mesh size: 0.053 mm) with their top surface open. The oven temperature was adjusted to the test temperature of 140°C.

During the entire test (44 hours) the sample temperature was below the oven temperature of 140°C. The maximum sample temperature was 139°C.

Neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C was observed. Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008.