Which class does not include flammable liquids?

Class 6, which includes toxic substances and infectious agents, does not encompass flammable liquids. Flammable liquids are typically categorized in Class 3, which is specifically designated for substances that can easily ignite and pose fire hazards. Class 2 consists of gases, some of which can be flammable, but not all gases are considered flammable. Class 5 relates to oxidizers and organic peroxides, which can support combustion but are not classified as flammable liquids themselves. Therefore, Class 6 stands apart from the other classes when it comes to the handling and storage of flammable materials, leading to its distinction as not including flammable liquids.