Explosion proof 1/2 "square 17 piece boxed sleeve material: aluminum bronze, beryllium bronze aluminum bronze material, working surface hardness HRC25 ° or above, tensile strength not less than δ B 75-85kgf/mm2 is a national grade IIB product that does not ignite gas when operating in ethylene gas with a concentration of 7.8%; Beryllium bronze material, working surface hardness HRC35 ° or above, tensile strength δ B> 105-120kgf/mm2, belonging to the national IIC level product, does not detonate gas when operating in hydrogen gas with a concentration of 21%; Beryllium copper alloy explosion-proof tools also have special anti magnetic functions, which can be used normally in working environments with magnetic fields. The above two materials of explosion-proof tools can effectively prevent flammable explosions caused by friction and impact between tools and working objects, confirming national property and personal safety! Applicable places: petroleum, chemical, mining, anti-terrorism, anti magnetic field, coal mine, gas production, oil and gas pipeline, power generation, metallurgy, excellent quality, aviation, storage and transportation, pharmaceuticals, gas production, plastic, chemical fiber, leather, fireworks, firecrackers, etc. Hebei TuoKai Explosion proof Tools Co., Ltd. welcomes people from all walks of life to visit and negotiate!