The Harris Blockage Phosphorus Tin Silicon Brazing Alloy is a proprietary phosphorus-tin-silicon alloy engineered as an inexpensive alternative to copper-copper and copper-brass alloys. It is self-fluxing on copper and its lower melting temperature makes it an excellent choice for brass connections. BLOCKADE flows rapidly but can be used to “cap” brazed joints.
Blockade’s® unique silicon addition offers significant advantages over phos/copper and silver/phos/copper, (BCuP), brazing alloys. Among the benefits are: bright alloy color during cooling that allows visual verification of a good braze joint, improved ductility over BCuP-2 alloy, reduced brazing temperature, and reduced material costs. It is often used with Stay-Silv® white brazing flux as a replacement for high silver alloys when brazing brass.