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    American Fairfield Inc.

    General Purpose Filler

    General Purpose Filler

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    • High Temperature Alloys - Bronze Alloys

      Mainly used for high strength and stress.

    • Alloys Containing Aluminum

      Widely used in automotive and refrigeration. Available in wire, strip and a variety of preformed shapes.

    • Copper Alloys

      Pure Copper - Has excellent corrosion resistance and high electrical and thermal conductivity. Oxygen-Free is also available.

    • Brazing Alloys Containing Phosphorous

      Copper Phosphorous Alloys - Widely used alloys for copper-to-copper brazing because of the self-fluxing properties from the phosphorous content. Not for use with ferrous or nickel based materials.

    Characteristics BCuP-8

    Silverphos 18 is a ternary eutectic, low temperature brazing filler metal that is free flowing and self-fluxing on copper and some high copper and copper alloys by virtue of its phosphorus content. Brasses and most bronzes require the use of a flux for good wetting. This alloy becomes extremely fluid above its melting point. With most joint designs a clearance of 0.001in. to 0.003in. (0.025mm – 0.075mm) is desirable. Silverphos 18 should not be used on ferrous metals or nickel base alloys, since the phosphorus diffuses and produces brittle iron or nickel phosphides at the joint interface.

    Characteristics BAlSi-4

    AL 718 has a low melting point and narrow melt range which makes it suitable for brazing aluminum alloys. In addition, the increased silicon content compared to other aluminum filler metals provides increased fluidity as well as reduced shrinkage. The use of AL 718 also significantly reduces hot cracking during the brazing process.

    Characteristics BCu-3

    CDA 102 is a free-flowing filler metal that exhibits good wetting characteristics on ferrous and nickel-based materials. Maximum strength and joint integrity are obtained where joint clearance falls within the range of 0.000in – 0.001in (0.000- 0.025mm) per side.

    Characteristics BAlSi-4

    Silverphos 5 is a copper rich, filler metal that is self-fluxing on copper by virtue of its phosphorus content. The self-fluxing property of this filler metals is effective on copper only. With copper-base alloys, such as brass or bronze, the joints should be fluxed. Silverphos 5 should not be used on nickel-base and iron-base alloys, as the phosphorus reacts with the nickel or iron to form brittle compounds at the interface of the joints. Silverphos 5, because of its higher phosphorus content, is more when heated rapidly to its flow point. Silverphos has less tendency to form large fillets or to fill poorly fitted joints. Silverphos has a strong tendency to liquate (separation into low and high melting constituents) if heated slowly through its melting range, as normally occurs in furnace brazing. The results in leaving a “skull” of un-melted alloy behind may objectionable from the standpoint of appearance. In furnace brazing it is preferable to pre-place the alloys inside the joint where the skull is not visible. Normally, the corrosion resistance of Silverphos 5 is of the same order as copper, but under certain conditions may corrode more rapidly. Silverphos 5 should not be used where the joints are exposed to sulfur compounds, especially in gasses or oils at temperatures above normal room temperature. As the corrosion by sulfur is cumulative, even very small percentages will eventually cause failure of the joint disintegration. Exposure to pressured steam can also result in accelerated corrosion.