There are a number of different considerations that are required before selecting the best impeller choice for your application. The most important factor is viscosity as this can impact several aspects of impeller choice and design. The tank size, design and placement is also of consideration and lastly there is a choice of what material to use for the impeller which all will depend on what you are mixing and your desired results. As standard we use 316 Stainless Steel for the impellers as this is the most common and durable material, however on occasion we can specify other materials of choice. Our team are always available to help with impeller selection if you have further questions on out impeller options.