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EC number: 807-595-3 | CAS number: 6965-58-8
Auto flammability
Administrative data
Link to relevant study record(s)
- Endpoint:
- auto-ignition temperature, other
- Remarks:
- autoignition for dispersed dust
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- August - November 2015
- 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:
- EU Method A.16 (Relative Self-Ignition Temperature for Solids)
- 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
- Conclusions:
- The autoflammabilty temperature of dispersed dust of N-Isobutyryl-thiourea was tested to be 375 °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 N-Isobutyryl-thiourea was tested to be 375 °C.
- Endpoint:
- relative self-ignition temperature (solids)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- August - November 2014
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study 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:
- Deposited dust: 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
- Relative self-ignition temperature:
- > 360 °C
- Remarks on result:
- preliminary test
- Conclusions:
- No auto-ignition of deposited N-Isobutyryl-thiourea dust occurred 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) deposited dust of the test substance N-Isobutyryl-thiourea melted quickly melted but no further reaction was observed.
Referenceopen allclose all
Weighted sample |
Temperature |
Reaction |
100 mg |
385 °C |
ignition |
100 mg |
380 °C |
ignition |
100 mg |
375 °C |
ignition |
100 mg |
370 °C |
no ignition |
100 mg |
365 °C |
no ignition |
100 mg |
360 °C |
no ignition |
300 mg |
395 °C |
ignition |
300 mg |
390 °C |
ignition |
300 mg |
385 °C |
ignition |
300 mg |
380 °C |
no ignition |
300 mg |
375 °C |
no ignition |
300 mg |
370 °C |
no ignition |
500 mg |
400 °C |
ignition |
500 mg |
395 °C |
ignition |
500 mg |
390 °C |
ignition |
500 mg |
385 °C |
no ignition |
500 mg |
380 °C |
no ignition |
500 mg |
375 °C |
no ignition |
At the highest temperature (360 °C) deposited dust of the test substance N-Isobutyryl-thiourea melted quickly but no further reaction was observed.
Description of key information
Two tests for dusty N-Isobutyryl-thiourea are available evaluating the auto-flammability on a hot surface for deposited and dispersed N-Isobutyryl-thiourea. No auto-ignition of deposited N-Isobutyryl-thiourea dust occurred on surfaces until 360°C. Nevertheless the autoflammabilty temperature of dispersed dust of N-Isobutyryl-thiourea was tested to be 375 °C.
Key value for chemical safety assessment
- Autoflammability / Self-ignition temperature at 101 325 Pa:
- 375 °C
Additional information
No auto-ignition of deposited N-Iso-butyryl-thiourea dust occurred on surfaces until 360°C.
The autoflammability temperature of dispersed dust of N-Isobutyryl-thiourea was tested to be 375 °C.
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