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Lucas-Milhaupt SIL-FOS 5 Silver/ Copper/ Phosphorus Alloy

Category Metal , Nonferrous Metal , Copper Alloy , Solder/Braze Alloy
Manufacturer Lucas-Milhaupt
Trade Name SIL-FOS
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Lucas-Milhaupt SIL-FOS 5 Silver/ Copper/ Phosphorus Alloy.pdf
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Material Notes:
Applications: Sil-Fos 5 was developed primarily for use on copper, but their use has extended to other nonferrous copper base alloys. It is used extensively on refrigeration units, air conditioning apparatus, electrical conductors, copper and brass pipe fittings, and other copper and brass equipment. Characteristics:Sil-Fos 5 is copper rich, filler metals that are self-fluxing on copper by virtue of their phosphorus content. Sil-Fos 5, because of its higher phosphorus content, is more fluid than Sil-Fos 5 when heated rapidly to its flow point. Sil-Fos has less tendency to form large fillets or to fill poorly fitted joints with large clearances cannot be maintained or where fillets are specified.The self-fluxing of these filler metals is effective on copper only. With copper-base alloys, such as bass or bronze, the joints should be fluxed with Handy-Flux. Sil-Fos 5 should not be used on nickel-base alloys, as the phosphorus reacts with the nickel or iron to form brittle compounds at the interface of the joints. Both Sil-Fos 5 is mutually soluble with copper and copper alloy base metals. This metal has a strong tendency to liquate (i.e. to separate 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 unmelted alloy behind which may objectionable from the standpoint of appearance. In furnace brazing it is preferable to preplace the alloys inside the joint where the skull is not visible. Specifications:This filler metal conform to the following specifications: AWS A5.8 BCuP-3Information provided by Lucas-Milhaupt, Inc.
Physical Properties Metric English Comments
Density 8.14 g/cc
0.294 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength at Break 241 - 276 MPa
35000 - 40000 psi
Nickel-Silver butt joint
Tensile Strength, Ultimate 207 - 241 MPa
30000 - 35000 psi
Copper butt joint
241 - 276 MPa
35000 - 40000 psi
Brass butt joint
80.0 MPa

@Temperature 427 °C
11600 psi

@Temperature 800 °F
Brass butt joint
109 MPa

@Temperature 427 °C
15800 psi

@Temperature 800 °F
Copper butt joint
163 MPa

@Temperature 260 °C
23600 psi

@Temperature 500 °F
Copper butt joint
197 MPa

@Temperature 260 °C
28500 psi

@Temperature 500 °F
Brass butt joint
221.0 MPa

@Temperature 93.3 °C
32050 psi

@Temperature 200 °F
Copper butt joint
234 MPa

@Temperature 93.3 °C
34000 psi

@Temperature 200 °F
Brass butt joint
Elongation at Break 2.0 - 5.0 %
2.0 - 5.0 %
% in 2", Nickel-Silver butt joint
15 - 20 %
15 - 20 %
% in 2", Copper butt joint
20 - 25 %
20 - 25 %
% in 2", Brass butt joint
2.9 %

@Temperature 427 °C
2.9 %

@Temperature 800 °F
in 2", Brass butt joint
9.4 %

@Temperature 427 °C
9.4 %

@Temperature 800 °F
in 2", Copper butt joint
19.2 %

@Temperature 260 °C
19.2 %

@Temperature 500 °F
in 2", Brass butt joint
19.2 %

@Temperature 93.3 °C
19.2 %

@Temperature 200 °F
in 2", Brass butt joint
24.5 %

@Temperature 260 °C
24.5 %

@Temperature 500 °F
in 2", Copper butt joint
32.8 %

@Temperature 93.3 °C
32.8 %

@Temperature 200 °F
in 2", Copper butt joint
Thermal Properties Metric English Comments
Melting Point 640.6 - 812.8 °C
1185 - 1495 °F
Solidus 640.6 °C
1185 °F
Melting Point
Liquidus 812.8 °C
1495 °F
Flow Point
Component Elements Properties Metric English Comments
Copper, Cu 88 - 90 %
88 - 90 %
Other, total <= 0.15 %
<= 0.15 %
Phosphorous, P 5.8 - 6.2 %
5.8 - 6.2 %
Silver, Ag 4.8 - 5.2 %
4.8 - 5.2 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000181 ohm-cm
0.0000181 ohm-cm
Processing Properties Metric English Comments
Processing Temperature 704 - 816 °C
1300 - 1500 °F
Brazing Range
Descriptive Properties Value Comments
Color Gray
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