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Tombac, or tombak, is a brass alloy with high copper content and 5–20% zinc content. [1] Tin , lead or arsenic may be added for colouration. [ 2 ] [ 3 ] It is a cheap malleable alloy mainly used for medals , ornament , decoration and some munitions .
Please see external links for images of buttons (front & back) made from the material(s) in question. ("NBS name" refers to labelling used by the National Button Society, USA.) ("NBS name" refers to labelling used by the National Button Society, USA.)
Silicon tombac has good friction bearing characteristics and is corrosion resistant but is not resistant to ammonia atmosphere. The strength properties are largely retained at application temperatures up to 200 °C. [1] It is a special alloy in terms of the combination of casting process and casting temperature.
The most satisfying phase of button collecting, however, will be the study which each button affords as to material or identification of subject or design. It entails the perusing of volume after volume of history and art and costuming; dating a button by shank or material; researching for characteristics of buttons of various countries; and ...
CENTAUR ammunition cartridges have a polymer coating on the steel case, are berdan primed, use non-corrosive Russian-made propellants produced by Tula machine plant., [6] and are loaded with American-made "tombac" jacketed bullets produced by Hornady Manufacturing Company. [7]
Stud buttons (also push-through buttons or just studs) are composed from an actual button, connected to a second, button-like element by a narrow metal or plastic bar. Pushed through two opposing holes within what is meant to be kept together, the actual button and its counterpart press it together, keeping it joined.
tombac A brass alloy that was used to make Canadian 5-cent coins in 1942 and 1943, during which there was a shortage of the usual nickel due to World War II. A shortage of copper forced a switch to chromium-plated steel in 1944. trade dollar Silver dollar issued specifically for trade with a foreign country. [1] truncation
Firmin & Sons is a British company, founded in 1655, that manufactures and supplies military ceremonial buttons, badges, accoutrements, and uniforms. Thomas Firmin was born in Ipswich , Suffolk in 1632 and was apprenticed to The Girdlers Company the makers of belts both for fine dress and for utility.