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王 “Sheaffer's nib tipping, from as far back as we could find samples, presented the greatest number of components; a total of seven in the early, circa 1919 Sheaffer's self-filling #4. Tungsten, though neither precious nor noble, is very hard and durable. Sheaffer's company, based on our findings, was the first to engineer their tipping alloy:
Tungsten - 45.6%
Nickel - 33.4%
Iridium - 7.7%
Osmium - 4.7%
Iron - 4.6%
Silver - 4.5%
Aluminum - 2.5%
The large Sheaffer's Lifetime from the mid 1920's shows a very different profile:
Rhodium - 55.0%
Osmium - 31.8%
Ruthenium - 8.2%
Platinum - 3.0%
Aluminum - 1.7%
Iron - .3%
The Sheaffer's Feather-Touch from the late 1930's with both tungsten and cobalt is most similar to the Parker Vacumatic from around the same period:
Ruthenium - 37.1%
Osmium - 30.2%
Tungsten - 22.2%
Cobalt - 8.2%
Aluminum - 2.0%
Iron - .5%
The presence of aluminum, iron and copper, I believe, may be looked at as a sign that the metallurgists were not entirely in control of the materials that they were putting into the alloys. These materials are either not hard, easily corrode, or both. The other materials in these alloys are workable tipping materials. Or possibly, Sheaffer's was experimenting with small amounts of these elements to some end that I do not understand. Sheaffer's company was well ahead of their time in many of their products and processes. (Consider the early use of plastics and the perfection of the lever filler.)”
source：http://www.nibs.com/article4.html
Tungsten - 45.6%
Nickel - 33.4%
Iridium - 7.7%
Osmium - 4.7%
Iron - 4.6%
Silver - 4.5%
Aluminum - 2.5%
The large Sheaffer's Lifetime from the mid 1920's shows a very different profile:
Rhodium - 55.0%
Osmium - 31.8%
Ruthenium - 8.2%
Platinum - 3.0%
Aluminum - 1.7%
Iron - .3%
The Sheaffer's Feather-Touch from the late 1930's with both tungsten and cobalt is most similar to the Parker Vacumatic from around the same period:
Ruthenium - 37.1%
Osmium - 30.2%
Tungsten - 22.2%
Cobalt - 8.2%
Aluminum - 2.0%
Iron - .5%
The presence of aluminum, iron and copper, I believe, may be looked at as a sign that the metallurgists were not entirely in control of the materials that they were putting into the alloys. These materials are either not hard, easily corrode, or both. The other materials in these alloys are workable tipping materials. Or possibly, Sheaffer's was experimenting with small amounts of these elements to some end that I do not understand. Sheaffer's company was well ahead of their time in many of their products and processes. (Consider the early use of plastics and the perfection of the lever filler.)”
source：http://www.nibs.com/article4.html
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