Polished Brass Polished brass is a beautiful finish that does not normally weather very well outdoors. We use a very durable baked on clear powder coat on most door pulls and push bars. In indoor usage, this finish is extremely durable. Stainless Steel Stainless steel is one of the most durable materials used in architecture; however there are many types with different properties and different levels of corrosion resistance. In most indoor (except chlorine and other harsh chemical exposure) and many outdoor (mildly corrosive) environments our standard stainless steel will perform exceeding well. It is best maintained by periodic water washing. If your job site has road salt, marine salt air, industrial, or urban pollution, we recommend the use of molybdenum bearing alloy 316 stainless steel. Specify US32316 or US32D316. To enhance the corrosion resistance of stainless steel, use the polished finish (629) in place of the satin finish (630). Minute particles of dirt and debris can lodge in the microscopic crevices of the satin finish more readily than on a smooth surface promoting corrosion. The mirror smooth surface of the polished finish has no rough surface to retain microscopic dirt or debris. Heat Resistant Exterior hot sunny climates call for a finish that is resistant to heat. We recommend our white powder coat finish (WPC). This durable exterior finish reflects much of the heat rays and is substantially cooler to the touch than stainless steel or other finishes. Bacterial Protection MicroShield® (630C) is the ideal finish for hospitals, schools, laboratories, assisted living facilities, public restroom areas, and anywhere there is a concern to control bacterial growth for demanding standards of cleanliness. Contact our customer service department for more detailed information.