GB/T 3685 - 2009 is formulated for conveyor belts. It specifies the requirements and test methods for the combustion characteristics of conveyor belts at the laboratory scale. It specifies the equipment required for the test, such as combustion boxes, etc.; standardizes the sample preparation process, including details such as size and quantity. By simulating combustion scenarios, it is determined whether the conveyor belt meets the combustion characteristics requirements according to indicators such as flame spread time and extinguishing time. This standard helps to ensure that the conveyor belt has good fire protection performance in actual use, reduces fire hazards, and ensures the safe operation of the material conveying system.