Thiers Issard
Thiers Issard or Thiers Issard Sabatier is a French cutlery manufacturer, one of a number of companies using the Sabatier name. It exports a wide range of knives and straight razors to approximately thirty countries. It is viewed as one of the top cutlery firms in Europe.
Along with DOVO Solingen, Thiers Issard is a manufacturer of straight razors in Europe and the rest of the world. It also makes exclusive and very expensive Damascus steel knives. It is located in Thiers, France, and is one of the better known of many cutlery manufacturers in that area. It has also been manufacturing razor blades since 1920. Thiers Issard is popular with US retailers.
History
Thiers Issard was established in 1884 by Pierre Thiers. He was part of a family of master razor makers. The Thiers family owned their own forge. The "Chart of the Jurande" or the Professional Guild Charter of the time lists at least three "Thiers" as master razor makers.In 1870 Pierre Thiers started as an apprentice to a master razor maker and, after 24 years in the trade, he had mastered the art well enough to become famous among the cognoscenti and connoisseurs of fine cutlery.
In 1884 Thiers established his own forge. He named his factory Thiers-Issard combining his last name and that of his wife as a way to differentiate himself from the rest of the family who owned similar businesses. From 1884 until his death in 1929, Thiers worked in his forge and died, reportedly, at work.
After his death, his son Pierre Thiers Jr., assisted by his mother, continued the family business. Pierre Thiers Jr. worked as an apprentice under his father and was a skilled forger in his own right. As the business prospered, more family members joined the company starting with Louis Thiers and later by another Pierre Thiers.
In 1985 the Thiers Issard company was acquired by Gilles Reynewaeter.
Razor construction
A straight razor blade starts, at the Thiers Issard factory, as a shape called a blank supplied by the steel manufacturer. Thiers Issard traditionally has used Sheffield silver steel, long considered a superior quality carbon steel. The first step is to clean the blank using a heavy forge process called the detourage. Following the forging stage, a hole is drilled in the tang of the blade. This is a crucial step since after the steel hardening process it would be next to impossible to drill hardened steel without employing specialised methods such as electrical discharge machining, and even then the process would be too arduous to be practical. At this pre-hardening stage the decoration or guiochage of the blade is done, since the blade is malleable enough to be carved.Lead hardening
The steel is hardened through a special process using a bath of molten lead where the forged steel blade is immersed at 800 °C. The efficient metal-to-metal heat transfer, from the surrounding lead to the steel blade, enables fast and uniform heating of the steel at the optimum temperature for maximum hardness. The steel is tempered following the hardening process, where at 300 °C it becomes flexible and brittleness is eliminated according to phase diagrams for steel.Thiers Issard is allowed by a special exemption in French law to continue using this lead hardening process, while health concerns prohibit its use by any other manufacturer.
Grinding
After hardening and tempering, the blanks are hollow ground, according to one of the two fundamental blade profiles. At the highest end of hollow ground, more hollow than even the 1/1 grade, is the so called singing razor, so named because its blade produces a specific resonant tone when plucked, similar to a guitar string. The singing razor blade at this excited stage is essentially a vibrating membrane. Its manufacturing process is so demanding that a full 25% of the blades get rejected as not meeting standards. Some of the company's cheaper lines are of half-hollow grind, such as the Super Gnome series of razors. Thiers Issard does not produce flat ground type blades.Finishing
Subsequently to grinding the blade is polished to various degrees of gloss. The best finish is poli glace or mirror finish. Mirror finish is the only finish used if gold leafing is to be part of the decoration of the blade.Satin finish requires less polishing time and therefore is not as expensive to produce. This finish is mostly used with black acid etching. Satin finish can sometimes be applied, as a compromise, to the back of the blade while the mirror finish and gold leafing are applied to the more visible front of the blade. This way the blade will not be as expensive as a fully mirror finished one.