This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Many copper-tin alloys are employed for the making of files which, in distinction from the steel files, are designated composition files. Such alloys have the following compositions:
I II
Copper........... 64.4 62
Tin.............. 18.0 20
Zinc.............. 10.0 10
Lead............. 7.6 8
III | IV | V | |
Copper.... | . . 57.0 | 61.5 | 73.0 |
Tin....... | . . 28.5 | 31.0 | 19.0 |
.. 78.0 | 8.0 | ||
Lead...... | .. 7.0 | 8.5 | 8.0 |
Another alloy for composition files is copper, 8 parts; tin, 2; zinc, l,and lead, 1—fused under a cover of borax.
 
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