Materials for explosion -proof gourds: Product signs or tonnage cards are made of brass or stainless steel, and their thickness should not be less than 1mm; when the explosion -proof level is IIC, the wheel pedal and margin part should be used for not bleaching the explosive gas mixture due to impact and friction. Made in copper alloy or other sparkless materials; explosion -proof electric gourd cable rolling wheels and running -and -the -operating stroke -limited switches should be made of bronze, brass or surface resistance than 109Ω. At this time, the traction line of the cable should be stainless steel wire rope; the rubber buffer shall comply with the regulations of JB/T8110.2, polyurethane buffer shall comply with the regulations of JB/T10833, and the surface resistance shall not be greater than 109Ω. Explosion -proof electric gourds in the operation method should be used for no sparkling materials.