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Self Contained Breathing Apparatus is the key productof Shanghai Laidi Science&Technology CO.,LTD. Our SCBA has meeting theStandard of China Regulation GA-2004 Code and EN136 &EN137 in Europe. It is made of fire-resistant material,compatible with different types of cylinders. Generally,the SCBA with 6.8L cylinder can support 40-90 minutes usetime. It provides breathing protection for users in the environment filled with poisonous air or lacking in oxygen. In the normal environment, the pressure inside the veil is always higher than outside environment. It prevents the poisonous air from dangerous environment entering the veil, so as to protect the users.RPP-20 is designed simple, easy to use,reliable and secure. It is the good product ofyourbest choices. The biggest advantage is its excellent quality and reasonable price. Following introduction isthestructure of SCBA: 1. Full mask : Genarally, the material of mask is polycarbonate and silicone, having the widely view. The mask is made for five-straps. 2. The demand valve : There is a rubber button in front of the demand valve ,we canpress the valve to get the air of cylinder. And avoiding the polluted air into the mask. 3. Compensated pressure reducer : The pressure of cylinder is about 30Mpa, the user is hard to breath in this pressure. So the function of the reducer is reducing the cylinder's pressure to the suitable pressure for workers. 4. Phosphorescent Gauge : The pressure gauge is check the pressure in the cylinder . The range of it is 0-40Mpa. 5. Cylinder : The cylinder is made of the carbon fibre material. It can bear the weight of 300KG. So it's more substance. According the users need, the cylinder is seperate in 3L/6.8L/9L and so on.