All silver solders are made using virgin metal in order to meet the new international standard ISO 17672 particularly with regard to the level of cadmium. Within the confines of the EU, cadmium bearing silver solder cannot be sold or placed on the market. Exceptions include aerospace and military applications.
Silver solders are available with silver content ranging from 1% to 76% silver The materials are available as wire, rods 1.0mm - 5.00mm dia, strip, foil, powder and paste.
Certificates of Conformity are readily available
All materials will produce high quality joints with a joint strength that is likely to exceed that of the parent materials. The silver solder selected will depend on other criteria such as brazing temperature, heating technique, service conditions and joint design. See "Best Brazing Practice"
Free technical advice is available to produce the most cost effective joints.
Lowering the silver content of the alloy leads to; higher brazing temperature (higher service temperature) wider melting range (better gap filling properties) larger fillets and lower alloy cost per kg but reduced corrosion resistance..
Copper Phos Alloys
CuP Alloys offer a range of self fluxing alloys for brazing copper in air. Typical uses include refrigeration plant and equipment, water heaters, calorifiers, electric elements, motors and transformers. They should not be used in hot sulphur bearing atmospheres eg locomotive boilers. The final choice depends on the brazing characteristics required, or service conditions and requirements of the brazed joint.
Increasing Silver Content:
increases joint ductility
lowers the melting range of the alloy
decreases the semi - molten temperature range
improves the joint ductility
increases the cost of the alloy
increasing phosphorus content:
increases fluidity of the molten alloy
reduces joint ductility
decreases the semi-molten temperature range
Rod 1.5mm - 5.0mm round or square
Length 250 - 1000mm
Wire, Powder, Paste Preforms
These materials, used with a flux, can also be used to braze copper alloys.
N.B, Copper phosphorus alloys should not be used to braze copper to either nickel or ferrous alloys. Very brittle intermetallic compounds are formed leading to catastrophic joint failure.
All alloys are manufactured from virgin metals to ensure they there is no contamination. They are analysed prior to extrusion and drawing. Rods are melted in "flow tests" to ensure uniform brazing characteristics.