✔ Composition & Melting Behavior
Alloy Types:

CuP6 (Cu-6%P): Melting range 710–890°C (higher flow temp).

CuP8 (Cu-8%P): Melting range 710–800°C (most common).

CuP8+Ag (Cu-7.5%P-0.2%Ag): Improved ductility & strength.

Self-Fluxing: Phosphorus (P) removes oxides, eliminating need for separate flux (for copper-to-copper joints).

✔ Mechanical & Joint Properties
Shear Strength: 150–220 MPa (depends on base metal and joint clearance).

Electrical Conductivity: ~15–20% IACS (lower than pure copper due to P content).

Corrosion Resistance: Excellent in water, refrigerants, and mild chemicals.

✔ Wetting & Flow Characteristics
Excellent wetting on copper/brass/bronze (forms smooth fillets).

Controlled viscosity (paste form) for precise application.

Capillary action: Works best with 0.05–0.2 mm joint gaps.

✔ Thermal & Chemical Stability
Service Temperature: Up to 200–250°C (avoid high-stress, high-temp environments).

Not for ferrous metals (steel, cast iron): Forms brittle Fe₃P phosphides.