The Harris Sil-Fos 5 is a copper-phosphorus-silver brazing alloy designed for the rigorous demands of the HVAC and refrigeration industries. Classified as AWS BCuP-3, this alloy contains 5% silver, approximately 6% phosphorus, and the balance copper. The addition of silver significantly improves the ductility of the alloy compared to standard copper-phosphorus rods (like BCuP-2), making it more resistant to vibration and thermal cycling common in compressor and condenser lines.<\/p>\n
One of the primary technical advantages of Sil-Fos 5 is its wide melting range. With a solidus of 1190\u00b0F and a liquidus of 1495\u00b0F, it provides a substantial plastic range that allows operators to cap or fill loose connections effectively. This “sluggish” flow characteristic is particularly beneficial when brazing vertical up joints or when fit-up tolerances are not precise. The flat profile of these 36-inch rods further aids in controlling the deposition rate and heat input.<\/p>\n
Chemically, the phosphorus content acts as a fluxing agent when joining copper to copper, eliminating the need for external flux and reducing the risk of flux entrapment. However, when brazing brass or bronze fittings, a high-quality Stay-Silv white or black flux is required to dissolve the surface oxides. Note that this alloy should strictly not be used on ferrous metals or nickel-based alloys, as the phosphorus can form brittle intermetallic compounds that compromise joint integrity.<\/p>\n","protected":false},"excerpt":{"rendered":"Sil-Fos 5 is an alloy for copper-copper brazing, specifically appropriate for filling gaps, forming fillets. \n\nNo flux is required due to phosphorous in the Sil-Fos. \n\nUse in HVAC\/R Refrigerant systems, air conditioning coils, evaporator coils.","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[1966,1959],"product_tag":[],"class_list":{"0":"post-1779788","1":"product","2":"type-product","3":"status-publish","5":"product_cat-silver-wires","6":"product_cat-welding-wires-and-electrodes","7":"pa_diameter-mm-flat","8":"pa_length-36-inches","9":"pa_packaging-description-25lb-tube","10":"pa_packaging-description-25lbs-per-pack","11":"pa_silver-content-1315","13":"first","14":"onbackorder","15":"taxable","16":"shipping-taxable","17":"purchasable","18":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/product\/1779788","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/media?parent=1779788"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/product_brand?post=1779788"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/product_cat?post=1779788"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/josefgases.com\/stage\/wp-json\/wp\/v2\/product_tag?post=1779788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}