Aluminum Channel                                              Aluminum Association Aluminum Channel has very slightly rounded corners on the legs ends and is rounded on inside radius for added strength of the additional material and is typically used for structural and higher strength applications. It is most commonly produced in 6061 alloy. American Standard Aluminum Channel has tapered legs that get smaller toward the end of the legs, Generally used for heavy duty structural applications. It is most commonly produced in 6061 alloy. Architectural Aluminum Channel has square, sharp, defined edges and is used for lightweight structural and cosmetic applications. It is generally produced in 6063 alloy and smaller sizes than other types of aluminum channel.