Sluice Gates body and frames are made from cast iron material and typically have bronze seating faces. They come in many different configurations and pressure classes depending on the application. These types of gates are normally used in heavy duty or higher pressure applications.
Slide Gates normally are known for medium duty type or corrosive applications. Like Sluice Gates these have either Stainless Steel or Aluminum construction with J-Bulb or UHMW seals. This type of gate is normally used in treatment plants and with the recent addition to better engineering design/modeling software, slide gates are being designed to see higher pressures similar to Sluice Gates.