Organic peroxides is a kind of organic substance with bivalent O-O-structure, and may also be a derivative of hydrogen peroxide. Such as formic acid (HCOOOH), acetic acid (CH3COOOH), etc. Organic peroxides are substances with poor thermal stability, and can undergo exothermic accelerated decomposition process. Their fire hazard characteristics can be summarized as follows:
Decomposition explosiveness: Organic peroxides all contain extremely unstable peroxy-O-O -, which is extremely sensitive to heat, vibration, impact and friction, so they will decompose when subjected to slight external force. If diacetyl peroxide is used, a strong explosion may occur after 24 hours of storage after the pure product is made; When the water content of benzoyl peroxide is below 1%, slight friction can cause explosion; Diisopropyl peroxydicarbonate is unstable above 10 ℃ and decomposes and explodes when it reaches 17.22 ℃; Peracetic acid (peracetic acid) is extremely unstable and can explode even at -20 ℃. When the concentration of a solution exceeds 45%, oxygen can still be decomposed during storage. When heated to 110 ℃, it will explode. It is not difficult to see that Organic peroxides is very sensitive to temperature and external force, and its danger and harm are greater than other oxidants.
Flammability: Organic peroxides is not only easy to decompose and explode, but also very flammable, some very flammable. For example, the flash point of Tert-Butyl hydroperoxide is 26.67 ℃. Therefore, special attention should be paid to the danger of explosion when fighting Organic peroxides fire.
In addition, Organic peroxides are generally easy to hurt eyes, such as cyclohexanone peroxide, tert butyl hydroperoxide, diacetyl peroxide, etc., which are harmful to eyes. Therefore, avoid eye contact with Organic peroxides.
In conclusion, the fire risk of Organic peroxides mainly depends on the peroxide content and decomposition temperature of the substance itself. The more peroxide content of Organic peroxides is, the lower its thermal decomposition temperature is, and the greater the fire risk is.
In the category of flammable and explosive hazardous materials, there are three categories: flammable solids, substances that are prone to spontaneous combustion, and substances that release flammable gases when exposed to water. Flammable solids mainly refer to solid substances that are easily ignited by various ignition sources, substances that are prone to spontaneous combustion when in contact with air, and substances that release flammable gases when in contact with water are mainly substances that release flammable gases and heat when in contact with water.