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The Encyclopedia of Horology

Switzerland · 1930s

Nivarox Balance-Spring Alloy

Needs research

Its name was later adopted by the Swiss hairspring supplier Nivarox-FAR.

A self-compensating, nearly non-magnetic alloy for balance springs, allowing monometallic balances without cut bimetallic rims.

Background

Nivarox was developed in 1933 by Reinhard Straumann at his laboratory in Waldenbourg to address the challenges of temperature-related rate fluctuations in mechanical watches. The name is derived from the German 'Nicht variabel oxydfest', meaning non-variable and non-oxidizing. As a nickel-iron alloy, it possesses a low temperature coefficient of elasticity, meaning its spring constant remains stable despite temperature changes.

By maintaining consistent elasticity, this material allows balance wheels to maintain accurate time without the complex compensation balances required in the 19th century. Beyond horological applications for hairsprings and mainsprings, the alloy is utilized in micro-machine industries and the construction of surgical instruments.

Written from the encyclopedia entries listed under Sources; each statement was checked against the cited text.

How it works

  • The alloy composition generally includes iron as the base, nickel between 30-40%, and varying amounts of beryllium, chromium, molybdenum, titanium, manganese, silicon, and carbon.
  • Nivarox springs are fabricated in several versions including Nivarox-CT, CTC, M, and W depending on the specific industrial application.

Later history

  • The company Nivarox-FAR SA was formed by a 1984 merger between Nivarox SA and Fabriques d'Assortiments Réunis.
  • Nivarox alloys are now used by most watchmakers globally, accounting for approximately 90% of the market share.

How to verify this yourself

Search the relevant national patent office archive (Espacenet covers most European and US specifications) by inventor name and date range; confirm the number from the specification itself, not secondary sources.

Manufacturers known to have used it

  • Swiss manufacturers broadly

Photographs

Balance spiral spring with roller for watch movements NIVAROX - New old stock | eBay
Balance spiral spring with roller for watch movements NIVAROX - New old stock | eBay — ebay.com, Rights unverified — web image search result, review pending. Web page (ebay.com)

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Nivarox, Wikipedia (English), retrieved 2026-10-28 (text CC BY-SA 4.0)
  2. Straumann Group corporate history
  3. Swatch Group, Nivarox-FAR company history

Where sources disagree, the disagreement is stated rather than resolved silently.