The oxidizing solid test is designed to determine the potential of solid substances to increase the burning rate or burning intensity of combustible substances when they are completely mixed with combustible substances. The following is an introduction from three aspects: test method, judgment logic, and precautions:
Test method
1. Burning time method:
• The solid to be tested and the combustible cellulose filaments are mixed in a certain mass ratio (such as 1:1 or 4:1) to form a cone, and the mixture is heated by an electric heating wire.
• When the mixture burns, the duration of continuous burning of the mixture as a whole is measured.
• At the same time, a known oxidizing solid (such as potassium bromate) is used as a reference substance, and the same test is conducted after mixing with cellulose filaments as the solid to be tested.
• Finally, the burning times obtained after the solid to be tested and potassium bromate are mixed with cellulose filaments are compared, so as to classify and judge the oxidizing property of the solid to be tested.
2. Burning rate method:
• The solid to be tested and the combustible cellulose filaments are mixed in a certain mass ratio to form a cone, and the mixture is heated by an electric heating wire.
• When the mixture burns, the burning rate of the mixture is calculated by measuring the rate of mass loss of the mixture as a whole.
• At the same time, a known oxidizing solid (such as calcium peroxide) is used as a reference substance, and the same test is carried out after mixing with cellulose filaments as the solid to be tested.
• Finally, the burning rates obtained after the solid to be tested and calcium peroxide are mixed with cellulose filaments are compared to classify and judge the oxidizing property of the solid to be tested.
Judgment logic
• First-level oxidizing articles: refers to solid oxidizing articles that show a burning time less than the average burning time of a mixture of potassium bromate and cellulose with a mass ratio of 3:2 when the mass ratio of the substance to cellulose tested by the standard test method is 4:1 or 1:1.
• Second-level oxidizing articles: This level does not directly give specific judgment criteria in the information provided, but is usually between the first and third levels and has specific combustion characteristics.
• Third-level oxidizing articles: refers to solid oxidizing articles that show a burning time less than or equal to the average burning time of a mixture of potassium bromate and cellulose with a mass ratio of 3:7 when the mass ratio of the substance to cellulose tested by the standard test method is 4:1 or 1:1, but do not meet the first and second level standards.
Precautions
•Safe operation: Although oxidizing solids are not explosives, they are also explosive when stored in large quantities or under certain extreme conditions. Therefore, special attention should be paid to daily operation, storage, use and transportation. Keep away from heat sources, sparks, open flames, hot surfaces, smoking is prohibited, and open flames or heating treatments are not allowed.
•Physical shape: When testing oxidizing solids, the substances or mixtures in the provided shape should be used for testing. When supplying or transporting, batches with different physical shapes need to be tested separately to accurately determine their hazard categories.
•Avoid contact: Avoid oxidizing solids from contacting incompatible materials such as flammable substances and reducing agents, and isolate them for disposal.
•Personal protection: During the production process, protective gloves, protective clothing, protective goggles, protective masks, etc. need to be worn to protect personal safety.
•Compliance labeling: During the operation and transportation of oxidizing solids, enterprises need to prepare compliant SDS reports and labels in accordance with regulations and standards, and post corresponding packaging marks on product packaging.