乙类厂房1. 闪点大于等于 28℃，但小于 60℃的液体2. 爆炸下限

Plant B <br>1. The flash point of not less than 28 ℃, but the liquid is less than 60 ℃ <br>2. equal to 10% greater than the lower explosive limit of the gas <br>3. Group A does not belong to the oxidant <br>4 are not flammable hazardous solid Chemical Class A <br>5. combustion supporting gas <br>dust floating state 6 can form an explosive mixture with air, a fiber, a flash point greater than or equal to 60 deg.] C liquid droplets

Class B plant<br>1. Liquids with flash points greater than or equal to 28 degrees C, but less than 60 degrees C<br>2. Gas with a lower explosion limit greater than or equal to 10%<br>3. Oxidants that are not part of Class A<br>4. Chemically flammable and dangerous solids that are not classified as Class A<br>5. Gas-assisted bodies<br>6. Dust, fibers, liquid mist droplets with flash points greater than or equal to 60 degrees C that can form explosive mixtures of air ...

Class B workshop<br>1. Liquid with flash point greater than or equal to 28 ℃, but less than 60 ℃<br>2. Gas with lower explosion limit greater than or equal to 10%<br>3. Oxidants not belonging to class A<br>4. Chemical flammable hazardous solid not belonging to class A<br>5. Combustion supporting gas<br>6. Dust, fiber and liquid droplet with flash point of 60 ℃ or higher in floating state that can form explosive mixture with air<br>