Is there no data on the flash point of dichloromethane?
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Dichloromethane is somewhat peculiar in that its flash point cannot be determined; however, it is combustible in practice. So how should the fire hazard category of dichloromethane be classified? A, B, or C is all possible. . Has anyone studied this issue?
Dichloromethane has no flash point, but it does have an explosive limit; therefore it is a flammable substance. Its fire hazard is clearly classified as Class C-B in GB50160 (as stated in the explanatory notes for clause 3.0.2).
New petrochemical regulations: dichloromethane is classified as Category B of C
Based on my own understanding, and from what I’ve found online, when a liquid is heated to its explosive limit, the temperature of its surface at that point is known as the flash point. In other words, without a flash point, there is no explosive limit. Is it true that dichloromethane typically has no flash point nor an explosive limit? It is only under pressure that it can vaporize to a certain concentration; since dichloromethane is a pure substance, the concentration increases under pressure, and once a certain concentration is reached, a flash point appears, along with an explosive limit. In other words, the explosion limit is a value under pressurized conditions. It’s just my personal understanding; I’d appreciate your feedback.
Increasing it might not be the right approach; it should be decreased instead