Registration Dossier

Physical & Chemical properties

Auto flammability

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
GLP compliance:
not specified
Specific details on test material used for the study:
- Analytical purity: 99.9 %
- Lot/batch No.: 301601
Key result
Remarks on result:
no self-ignition observed up to the melting point

The test phenomena and results of the test are shown in the following table:

No.

1

2

Sample volume

8cm3

8cm3

Heating rate

0.5oC/min

0.5oC/min

Oven Temperature when Sample Temperature reached its melting point/range

About 2oC higher thanSample Temperature

About 2oC higher thanSample Temperature

Test phenomena

1) The sample temperature could not reach 400oCuntil the sample was heated to its melting point.

2) There was no substance in the vessel after the test completed.

1) The sample temperature could not reach 400oCuntil the sample was heated to its melting point.

2) There was no substance in the vessel after the test completed.

1) It could be considered as an endothermic effect from the sample melting that the oven temperature was about 2 °C higher than the sample temperature when the sample was heated to its melting point.

2) There was no substance in the vessel after the test was completed. This could prove that the sample in the vessel had melted and flowed away from the cribriform vessel.

3) The sample temperature could not reach 400 °C prior to that of the oven until the sample was heated to its melting point. It could be confirmed that the relative self-ignition temperature was above the melting point.

Conclusions:
The sample temperature could not reach 400 °C prior to that of the oven, until the sample was heated to its melting point. Therefore the relative self-ignition temperature of 1,1 -Dimethylurea lies above its melting point.
Executive summary:

The relative self-ignition temperature of 1,1 -Dimethylurea was determined in a test sccording to EC Regulation No.440/2008 Annex A.16. A certain volume of the sample was placed in an oven and was heated at a constant but low rate. The temperature of the oven and in the centre of the sample were continuously recorded at the same time. For the purpose of this test, the tamperature of the oven at which the sample temperature reached 400 °C prior to the oven by self-heating was called the relative self-ignition temperature.

The sample temoperature could not reach 400 °C prior to that of the oven, until the sample was heated to its melting point. Therefore the relative self-ignition temperature of 1,1 -Dimethylurea lies above its melting point.

Endpoint:
self-ignition of dust accumulation
Remarks:
deposited dust
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
February 2004
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
equivalent or similar to guideline
Guideline:
DIN EN 15188 (Determination of the spontaneous ignition behaviour of dust accumulations)
Principles of method if other than guideline:
This test determines the ignition temperature of a dry product on a hot surface. For a description of the method see "any other information on materials and methods".
GLP compliance:
not specified
Key result
Self-ignition temperature:
> 360 °C

At the highest temperature (360 °C) no ignition, but the test substance 1,1-Dimethylurea starts to smoke when put onto the hot surface.

Conclusions:
No auto-ignition of deposited 1,1-Dimethylurea dust occured on surfaces until 360 °C.
Executive summary:

The test determines the ignition temperature of a deposited dusty test substance on hot surfaces. The test is conducted according to the test protocol. The surface area of the substance is increased intentionally in this test by preparing the test substance accordingly to simulate the deposited dusty properties. The ignition temperature of deposited dusty test material is expected to be lower than the ignition temperature of the solid with larger particle diameters. At the hottest temperature in this test (360°C) no auto-ignition of deposited 1,1-Dimethylurea dust occured.

Endpoint:
self-ignition of dust accumulation
Remarks:
dispersed dust
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
February - March 2004
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
equivalent or similar to guideline
Guideline:
DIN EN 15188 (Determination of the spontaneous ignition behaviour of dust accumulations)
Principles of method if other than guideline:
Dispersed dust: This test determines the ignition temperature of flammable dispersed dusty substances on hot surfaces. See section "any other information on materials and methods" for detailed description of the method.
GLP compliance:
not specified
Key result
Self-ignition temperature:
425 °C

Weighted sample

Temperature

Reaction

100 mg

455 °C

ignition

100 mg

450 °C

ignition

100 mg

442 °C

ignition

100 mg

435 °C

no ignition

100 mg

430 °C

no ignition

300 mg

448 °C

ignition

300 mg

445 °C

ignition

300 mg

437 °C

no ignition

300 mg

432 °C

no ignition

300 mg

426 °C

no ignition

500 mg

423 °C

no ignition

500 mg

426 °C

ignition

500 mg

420 °C

no ignition

500 mg

414 °C

no ignition

500 mg

408 °C

no ignition

Conclusions:
The autoflammabilty temperature of dispersed dust of 1,1-Dimethylurea was tested to be 425 °C.
Executive summary:

The test determines the ignition temperature of a dispersed dusty test substance on hot surfaces. The test is conducted according to a test protocol. The surface area of the substance is increased intentionally in this test by preparing the test substance accordingly to simulate the dispersed dusty properties. The ignition temperature of dispersed dusty test material is expected to be significantly lower than the ignition temperature of the solid with larger particle diameters. The autoflammabilty temperature of dispersed dust of 1,1 -Dimethylurea was tested to be 425 °C.

Description of key information

No auto-ignition of deposited dust of 1,1 -Dimethylurea occurred on hot surfaces until 360°C.

The autoflammability temperature of dispersed dust of 1,1 -Dimethylurea was tested to be 425 °C.

Furthermore the relative self-ignition temperature of 1,1 -Dimethylurea was determined in a test according to EC Regulation No.440/2008 Annex A.16. The test indicates that the relative self-ignition temperature of 1,1 -Dimethylurea lies above its melting point.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
425 °C

Additional information