Regarding the classification of hazardous chemicals under key supervision
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The General Administration defines them as follows: Hazardous chemicals that are subject to stringent supervision refer to those listed in the Catalogue, as well as hazardous chemicals that, under conditions of 20°C and a standard atmospheric pressure of 101.3 kPa, fall into the following categories: 1. Flammable gases, Category 1 (gases with an explosion lower limit of ≤13% or an explosion limit range of ≥12%)； 2. Flammable liquids, Category 1 (closed-cup flash point
Flammable liquids: Substances that are in liquid state at room temperature, easily catch fire when exposed to heat, and have a flash point below 45°C are referred to as flammable materials. Its characteristics include: flammability and explosiveness of steam, thermal expansion, tendency to accumulate static electricity, high fluidity and spreadability, reactivity with strongly oxidizing acids and oxidizers, and toxicity to varying degrees. The flash point refers to the lowest temperature at which, under specified conditions, a flammable liquid, when heated, causes a flash fire when its vapor mixture with air comes into contact with a flame. The flash point is an important indicator of the flammability and explosion risk of flammable liquids; the lower the flash point, the greater the risk of combustion and explosion. Based on flash point values, they can be divided into three categories: 1. Liquids with low flash points refer to those with a flash point in the closed-cup test
Reply to 2# yusea: The flash point refers to the lowest temperature at which, under specified conditions, a flammable liquid, when heated, causes a flash fire when its vapor mixture with air comes into contact with a flame. Is there a clear definition for this stipulated condition?
Reply to 3# Rainbow Environmental Protection: These two posts are about flash point discussions; please take a look. . . http://bbs.hcbbs.com/viewthread.php?tid=256465&highlight=%C9%C1%B5%E3 http://bbs.hcbbs.com/viewthread.php?tid=215527
May I ask, are there any requirements regarding the concentration of these hazardous chemicals that are under strict supervision? If the gas contains these components, (a mixed gas), should it also be subject to strict supervision?
I think the introduction of regulations regarding these hazardous chemicals that require close supervision is mainly intended to remind the safety supervision agencies at lower levels to strengthen oversight of such chemicals; otherwise, many staff members in these agencies at the county level do not pay enough attention to them. There should be requirements regarding the concentration of these hazardous chemicals that are under strict supervision, but this is not evident from the documents available. It is advisable to apply strict measures; if gases contain such components, it is best to treat them as substances under strict supervision.