... it can be widely used in petroleum and chemical industry, chemical fiber, medicine, food and so on.The main media are 304 ... such as: water, ammonia, oil hydrocarbon products;2. Corrosively medium for chemical production, such as: sodium hydrate, caustic ... oxygen;4. Industry hygiene medium in light industry, foodstuff and pharmacy, such as: beer, drink, beverage dairy products, and syrup medical articles ...