Copper-flo™ is the most free flowing copper-phosphorus filler metal, however, due to its high phosphorus content it is one of the least ductile. It is best suited for making copper joints of the true capillary type and should not be used in applications involving exposure to strong vibrations, impact loads or where some deformation of the joint might be expected in service.

EN1044:1999
CP201

Copper-flo™ No.2 is a specialised copper-antimony-phosphorus filler metal. It was specifically designed for flux-less brazing of copper cylinders for domestic and industrial heating systems where it is used for seam joints. The antimony in this filler metal improves its flow characteristics whilst allowing the phosphorus level to be kept low hence optimising ductility.

EN1044:1999
CP301

Copper-flo™ No.3 is a low cost, relatively ductile filler metal (when compared to Copper-flo™), which is not too fluid when molten so can be held in the joint area when brazing. These characteristics make Copper-flo™ No.3 a popular choice for air-conditioning and refrigeration applications. Where greater ductility is required Sil-fos™ 5 should be used.

EN1044:1999
CP203

Stan-fos™ is not self-fluxing on copper and must be used with a brazing flux such as Easy-flo™ Flux Powder. It is free flowing and produces a smooth fillet. Stan-fos™ is brittle/not ductile and should therefore not be used in applications involving exposure to strong vibrations or impact loads. It is used primarily on copper to copper alloy joints.

EN1044:1999
CP302