Beijing Tiandi first and the inventory of ammonia gas harm to people The olfactory threshold of human ammonia is 0.5-2 mg/m3. The harm of ammonia to humans is shown in the table. Concentration / (mg / m3) Contact time/min the level of danger Hazard classification 0.7 Feel the smell No harm to the human body 9.8 No stimulating effect 67.2 45 There is a irritating feeling in the nose and throat, and there is a burning sensation in the eyes. 70 30 Slow breathing Minor hazard 140 30 Nasal and upper respiratory tract discomfort, nausea, headache 140～210 20 The body has obvious discomfort but still works Medium hazard 175-350 20 Nasal eye stimulation, breathing and pulse acceleration 553 30 Strong stimulation, can withstand 1.25min Severe hazard 700 30 Cough immediately 1750～3500 30 life threatening 3500～7000 30 Immediate death This PU Lift Chair is the ultimate 'easy' chair: The PU lift chair is easy to look at, easy to use and easy to love. The PU lift chair feature gives you extra stability and support when it`s time to get up. Add generous padding for comfort and individually wrapped drop-in coils for durable support. And the covering materials is good quality PU. Pu Lift Chair,Power Raise Chair,Reclining Sectional Sofas,Living Room Recliner Chair Kaifeng Lanwei Smart Home Co., Ltd , https://www.sofas-world.com