SILVER-FLO filler metals

SILVER-FLO 55 is an easy to use, general purpose silver brazing filler metal. It has a low brazing temperature, short melting range and is free flowing when molten, producing neat joints with small fillets.

SILVER-FLO 55 is a cadmium-free replacement for the high silver (38-50%) cadmium containing filler metals. It can be used on most common engineering metals.

EN1044:1999
AG103

SILVER-FLO 56 has very similar properties to SILVER-FLO 55. It has a low brazing temperature, short melting range and is free flowing when molten, producing neat joints with small fillets. Originally conforming to the US standard AWS A5.8 BAg-7, it can be used as a cadmium-free replacement for the high silver (38-50%) cadmium containing filler metals.

AMS/AWS A5.8
AMS 4763, AWS Bag-7

EN1044:1999
AG102

SILVER-FLO 452 is a general purpose filler metal with 45% silver bridging the gap in properties and cost between high silver 55/56% filler metals and the medium silver 38/40% filler metals. It has the lowest silver content to braze PCD segments below 750˚C without degrading the diamond layer. It has good flow properties, but a slightly higher brazing temperature than the high silver content filler metals.

EN1044:1999
AG104

SILVER-FLO 40 offers a good combination of properties. It has a medium brazing temperature, melting range, flow characteristics and silver content. SILVER-FLO 40 is widely used as a general purpose silver brazing filler metal as well as for joining copper and its alloys to steel in HVAC&R applications.

AMS/AWS A5.8
BAg-28

EN1044:1999
AG105

SILVER-FLO 38 has similar properties to SILVER-FLO 40. It has a medium brazing temperature, melting range, flow characteristics and silver content. SILVER-FLO 38 is favoured in different global regions to SILVER-FLO 40 where it is also used in general purpose and HVAC&R applications.

SILVER-FLO 302 has a long melting range and poor flow characteristics, which make it an ideal choice for applications where fillet build ups are required or close tolerance joint gaps are not present. It is used for brazing steel, copper and copper alloy tubes and fittings in HVAC&R and automotive applications. It is a popular choice as a flux coated rod for site work.

EN1044:1999
AG107

SILVER-FLO 252 has a long melting range and poor flow characteristics, which make it an ideal choice for applications where fillet build ups are required or close tolerance joint gaps are not present. Like SILVER-FLO 302 it may be used for brazing steel, copper and copper alloy tubes and fittings in HVAC&R and automotive applications.

EN1044:1999
AG108

SILVER-FLO 60 is a filler metal specified for use on copper nickel and nickel alloys (in particular 70:30 copper nickel). It has a brazing temperature above the stress relieving temperature of many of these types of metals thus preventing liquid metal stress cracking as a result of inter-granular penetration. It is resistant to dezincification.

SILVER-FLO 56S is a Johnson Matthey proprietary filler metal which has a small addition of silicon, is very free flowing and produces smooth neat joints with small fillets. It is not recommended on carbon steel components that are subject to high impact or fatigue stress in service.

SILVER-FLO 453S has a small addition of silicon and produces smooth neat joints with small fillets making it popular for hand torch brazing of decorative brass components. Like other high silver content silicon containing filler metals it is not recommended for use on carbon steel components that are subject to high impact or fatigue stress in service.

SILVER-FLO 44 has a medium brazing temperature, melting range, flow and silver content. Although it is not preferred to the more common SILVER-FLO 40 or 38 it has found use in marine applications because it is resistant to dezincification. It is also used as a medium temperature filler metal for copper alloy tubes where joint gaps are variable and a fillet is desirable.

EN1044:1999
AG203

SILVER-FLO 43 has a medium brazing temperature, long melting range, and poor flow characteristics. It is not commonly used but has found use in the shipbuilding industry and in marine applications because it is the lowest silver content filler metal, which is resistant to dezincification. It is a good fillet forming and gap filling filler metal.

SILVER-FLO 24 has been incorporated into aviation / aerospace industry standards and is consequently used in the manufacture of components for applications in this field. It is also used as the first alloy in a two-step silver brazing operation, where the second joint is made with SILVER-FLO 55.

SILVER-FLO 20 is a high melting point silver brazing filler metal that has a comparatively narrow melting range providing reasonable flow properties when molten. It can be used when colour matching to brass is required.

SILVER-FLO 45 is a cadmium free silver brazing alloy originally developed and manufactured to a Johnson Matthey specification. Today this alloy has been largely superseded by SILVER-FLO 452, and is generally only offered where it is included in an old specification.

SILVER-FLO 45 combines a low brazing temperature with a short melting range. It is very free flowing and produces smooth neat joints with small fillets. The alloy is tin and silicon free. The optimum joint gap at brazing temperature is normally 0.05-0.15mm.

SILVER-FLO 34 is a cadmium free silver brazing filler metal. It exhibits poor / sluggish flow characteristics melting over a 100°C temperature range. Because of these characteristics SILVER-FLO 34 is not widely used today.

SILVER-FLO 34 has an ability to fill gaps that cannot be tightly controlled and to build fillets. Optimum joint gaps at brazing temperature are 0.075-0.2mm.

EN1044:1999
AG106

SILVER-FLO 33 is a cadmium free silver brazing filler metal. It shows free flowing characteristics melting over a short, but comparatively high, temperature range (700-740°C). It is a good brazing filler metal that has been used as the second filler metal in a three step sequential brazing process along with SILVER-FLO 16 and SILVER-FLO 55.

33 is not widely used today. Optimum joint gaps at brazing temperature are 0.075-0.2mm.

SILVER-FLO 30 is a cadmium free silver brazing filler metal that has been adopted for a thermal spray coating process used in the aerospace industry. It is supplied as a wire on plastic reels suitable for feeding into a thermal spray gun.

The filler metal itself has a long and high melting range and poor flow characteristics hence it is not used as a brazing filler metal to any extent. Optimum joint gaps at brazing temperature are 0.075-0.2mm.

EN1044:1999
AG204

SILVER-FLO 25 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(700 to 790°C) with a quoted melting range of 90°C. This melting range suggests medium to sluggish flow properties when molten. The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys.

Optimum joint gaps at brazing temperature are 0.075-0.2mm.

EN1044:1999
AG205

SILVER-FLO 18 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(784 to 816°C) but a narrow melting range of only 32°C providing good flow properties when molten. The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys. Consequently it is not widely used. This product is a relatively inexpensive filler metal to purchase. However the cost per brazed joint of actually using the alloy may not be favourable in comparison to lower melting point, higher silver content filler metals. Optimum joint gaps at brazing temperature are 0.075-0.2mm.

SILVER-FLO 16 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(790 to 830°C) but a narrow melting range of only 40°C providing good flow properties when molten.The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys. Consequently it is not widely used. This product is a relatively inexpensive filler metal to purchase. However the cost per brazed joint of actually using the alloy may not be favourable in comparison to lower melting point, higher silver content filler metals. Optimum joint gaps at brazing temperature are 0.075-0.2mm.

SILVER-FLO 56 Brazing Paste is a custom made solution for improving the quality and production rate of brazing operations. It consists of SILVER-FLO 56 powder, a free-flowing, low melting silver brazing filler metal, combined with a flux-binder system to form a smooth dispensible paste.

AMS/AWS A5.8
AMS 4763, AWS Bag-7

EN1044:1999
AG102

SILVER-FLO 55 brazing paste is a specially formulated paste product intended for use in semi- or fully automated brazing processes or where the use of a paste offers other advantages. It combines SILVER-FLO 55, a filler metal with excellent brazing characteristics, in powder form with a flux-binder system selected to match an individual application. The resulting product is a fully dispensable custom-made brazing paste.

EN1044:1999
AG103

SILVER-FLO 40 brazing paste is a specially formulated paste product intended for use in semi- or fully automated brazing processes or where the use of a paste offers other advantages. It combines SILVER-FLO 40, a filler metal with good general brazing characteristics, in powder form with a flux-binder system selected to match an individual application. The resulting product is a fully dispensable custom-made brazing paste.

EN1044:1999
AG105

SILVER-FLO 24 brazing paste is a specially formulated paste product intended for use in semi- automated brazing processes or where the use of a paste offers other advantages. It combines SILVER-FLO 24, a comparatively high melting temperature silver brazing filler metal, in powder form with a flux-binder system selected to match an individual application. The resulting product is a fully dispensable custom-made brazing paste.

SILVER-FLO 55 Paint consists of a silver brazing filler metal powder (SILVER-FLO 55) and a brazing flux (EASY-FLO™ Flux Powder) combined in a volatile organic solvent. The proportions of filler metal to flux are optimised to make the paint suitable for brazing small components by most heating methods.

The silver brazing filler metal in this product - SILVER-FLO 55, is cadmium-free. It combines a low brazing temperature with a short melting range, is very free flowing and produces neat joints with small fillets. These characteristics make it an excellent general purpose silver brazing filler metal. 

Joints made with SILVER-FLO 55 Paint are suitable for seawater applications, being resistant to dezincification. The optimum joint gap for this filler metal at brazing temperature is normally 0.05-0.15mm.