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What is Super-Titanium

Citizen's Super Titanium:
5 times harder, 40% lighter than stainless

For Citizen, quality watchmaking is more than just a time-honoured craft. It's also a science that evolves through time. We place importance on every facet of creating a valued timepiece, from originality of design and functionality, to the development of materials used.

For over four decades, Citizen have pioneered research into titanium – the exotic alloy which is used today in many fields, including aerospace, manufacturing and medical, as well as jewellery and watches. Our breakthroughs in surface-hardening technology have allowed us to develop Super Titanium, which is 5 times harder than stainless steel, yet 40% lighter. Combined with Citizen's proprietary ion-plating method, Super Titanium features unique Super Hard and Super Light characteristics.

Discovery of the ultimate transition mineral

Citizen's quest for the ultimate material for watches led to epoch-making discoveries using titanium. The metal is technically very difficult to process due to its high tensile strength and heat resistance. Since the mid-1960s, Citizen spearheaded R&D of titanium fabrication and treatment processes, which ultimately yielded a Super Titanium that is 5 times harder, yet 40% lighter than stainless steel.

Citizen's material science breakthroughs

Titanium gets its name from titanos, or titan, in Greek mythology, who were the giant sons and daughters of the sky and earth gods. The ore is obtained from minerals ilmenite and rutile, and is the ninth most abundant element in the Earth's crust. Discovered in the 18th Century, titanium is classified as a transition metal. It is remarkably strong, ductile, non-corrosive and lightweight. What's more, it's biocompatible, so it will not produce skin irritation or discolouration, making titanium extremely suitable for a wide number of modern applications. From spacecraft, supersonic jets to race cars, golf clubs and dental implants, titanium's durability and remarkable strength make it an ideal material. But the exceptional alloy perhaps shines best when used in jewellery and watches.

In 1970, Citizen made history with the debut of the world's first watch with a titanium case, which triggered a new era in watch-making. Four decades on, we're still defining the standards with innovations using the alloy.

Advanced ion-planting technology

Citizen's proprietary Ion-Plating (IP) surface hardening technique achieves superior surface hardness* by heating the alloy to over 2,000°C in a vacuum chamber through concentrated electron beams. The ionised titanium is then pressure-bonded to form the surface coating of the watch. (*1,200 on the Vickers hardness scale)

Stainless Steel

The tested surface is scratched easily and luster of the mirror-finished surface is lost.

Hardness of Material

Stainless Steel - Hv150-220
Normal Titanium - Hv170-200
Super Titanium – Hv1000-1200

Super Titanium

The tested surface is less scratched and luster of the mirror-finished surface is maintained.