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- Non-dangerous chemical identification/Chemical hazard identification/Hazard characteristic classification and identification
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- Safety Data Sheet (SDS) Preparation
- Safety Data Sheet (SDS) Review
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- Hazard Communication Label Review
Self-heating substances test
The self-heating substance test is a test used to evaluate whether a substance will heat itself when in contact with air without an external heat source. The following is a detailed introduction to the self-heating substance test:
Test purpose
The self-heating substance test is intended to determine whether a substance is a self-heating substance, that is, a solid or liquid substance or mixture that can self-heat without energy supply when reacting with air. Such substances may spontaneously combust in large quantities (kilograms) and after a long time (hours or days), posing a threat to safety during storage, transportation and use.
Test method
1. United Nations Manual of Tests and Criteria 33.4.6 Test N.4:
• Scope of application: Applicable to a variety of materials including activated carbon and carbon black.
• Test conditions: Usually cubic samples of different sizes (such as 100mm, 25mm) are used for testing at temperatures such as 100°C, 120°C, 140°C, etc. The test should be carried out under specific environmental conditions, such as an ambient temperature of 1°C and a relative humidity of 50%.
•Testing process: Place the sample in a constant temperature box and monitor whether it generates heat exceeding the ambient temperature by 60°C within the specified time.
•Judgment criteria: If the sample temperature does not exceed the detection temperature by 60°C during the test, it is considered that the sample does not have self-heating characteristics.
2.SN/T 2244-2009 "Self-heating Test Method for Dangerous Goods Self-heating Substances":
•Scope of application: It stipulates the standard method for determining self-heating substances in item 4.2 of dangerous goods for import and export.
•Testing principle: The substance is placed in a cubic steel wire mesh container with a side length of 25mm or 100mm and exposed to air at a temperature of 100°C, 120°C or 140°C, and whether spontaneous combustion or significant temperature rise occurs is observed to determine whether the substance will oxidize and self-heat.
•Testing equipment: Including hot air circulation oven, cubic sample container, thermocouple, etc.
•Testing procedure: Put the commercial powder or granular sample into the sample container, fill it to the edge, and tap the container several times. Cover the container with a hood and hang it in the center of the oven. Increase the oven temperature to 140°C and maintain it for 24h. Record the temperatures of the specimen and the oven continuously.
•Evaluation of results: A positive result is obtained if spontaneous combustion occurs within the 24h test time or the specimen temperature is 60°C higher than the oven temperature. Otherwise, the result is considered negative.
Report Sample
Self-heating material test report
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