Features waterproof doors, fire doors, waterproof fire closed doors, MMB waterproof closed doors Jinan Dongshan Mine Equipment Co., Ltd. (0531-89004695) Production of waterproof fire closed doors ----- 1, the wide range of waterproof fire closed doors applicable, in different section shapes, different forms of roadway stent use, versatile, very flexible; 2, light weight waterproof fire closed doors, easy to carry; to solve the traditional enclosed material transport difficulties, time-consuming and labor problems; 3 , waterproof fire closed doors sealing effect, leakage rate, balloon air tightness, no leakage can be maintained more than 24h; 4, waterproof fire closed doors fast speed of construction, generally only 5-7 minutes, as little as 4 minutes to complete the temporary closure; 5, simple waterproof fire closed doors operate, easy to grasp the ambulance crew, the available high-pressure nitrogen gas-filled bottles, inflatable artificial tiger skin can also be used; the highest quality waterproof fire closed doors available to you is my honor Our strong technical force, once you believe us, let me for you to create different water-tight door! Sales Hotline: 0531-89004695 15628887522 waterproof fire closed doors working environment ------ 1, the atmospheric pressure: 80kPa ~ 110kPa; 2, ambient temperature: -30 ℃ ~ 40 ℃; 3, the average relative humidity ≤95% (25 ℃); 4, a methane and coal dust explosion can be mixtures of underground coal mines; 5, not enough to corrode metal shell damage and electrical insulating gases; 6, pressure: 0 ~ 3.5MPa. We re-quality heavy service! You do not regret the choice! Come on! Jinan Dongshan Mine please call 0531--89004695 15628887522 http://www.jndongshan.com Equipment Co., Ltd.