The History of Sil-Fos
Founded more than a century ago in 1867, Handy & Harman (HNH) had long been recognized as a leading company in precious metal fabrication, processing and refining. In 1931, (HNH) patented Sil-Fos, a silver brazing alloy. When designed and brazed correctly, joints brazed with SilFos will exhibit strength higher than that of the parent materials, often leading to failure in the base metal before the joint itself.
Sil-Fos: The Brazing Alloy of World War II
Then, war struck the world. Americans bought war bonds, committed to victory gardens, and contributed to the war effort however they could. We saw an opportunity to support the war effort by releasing the patent for Sil-Fos; we produced over 240 million ounces of silver for defense needs.
Sil-Fos, Easy-Flo and other brazing alloys were used innumerable braze joints of planes, ships, and ammunition. Sil-Fos was instrumental in increasing the strength of airplane engine bearings and increasing engine efficiency, resulting in larger, faster airplanes.
The biggest contribution Sil-Fos offered was in machine repair. A broken or damaged metal shaft, bearing or gear could put a vitally-needed machine tool out of production. Replacement of the part might take as long as síx months under wartime conditions. But in many instances, the part could be repaired with the use of a Sil-Fos brazing alloy, and the machine restored to production in less than an hour.