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What Is Vulcanized Rubber?

By R. Kayne
Updated May 17, 2024
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Vulcanized rubber is an elastomer that has been made more durable through vulcanization, a biochemical process. The milky latex from a rubber tree is combined with a curing ingredient, usually sulfur, and heated under pressure.

The vulcanization process was discovered by American inventor Charles Goodyear in 1839. Vulcanization makes the rubber more stable, tougher and more heat resistant, so that it becomes more useful for industrial purposes and certain products. The term "vulcanized" is derived from Vulcan, the Roman god of fire and metalworking.

Vulcanization: Making Rubber Stronger

Before the discovery of vulcanization, natural rubber would be coagulated with acid and made malleable so that it could be shaped and formed. At high temperatures, though, the rubber would become sticky or melt, while at low temperatures, the rubber would become brittle. These qualities made rubber impractical to use in industrial settings.

Vulcanization chemically combines the rubber and sulfur. At high pressure and high temperatures, the sulfur atoms form links between long chains of the rubber molecules. This increases the rubber's strength and durability and reduces its stickiness. It also allows the rubber to retain its elasticity at a much wider range of temperatures, making vulcanized rubber far more useful for various applications.



The Development of Vulcanized Rubber

Charles Goodyear had experimented with rubber for several years before discovering vulcanization. A former hardware store owner with no scientific training or knowledge of chemicals, Goodyear went into debt while looking for a way to make rubber more stable and durable. It is often said that his discovery occurred by accident, after a mixture of sulfur and rubber gum splattered onto a hot stove and formed a hardened material. Goodyear, however, claimed that it was not accidental but rather the result of a series of experiments and observations.

Goodyear sent samples of his cured rubber to British rubber manufacturers. An Englishman named Thomas Hancock, who had been trying to make weatherproof rubber for 20 years, saw one of the samples and noticed the telltale yellowish powdery residue of sulfur on the surface of the sample. Hancock reinvented the process in 1843, four years after Goodyear.

Goodyear obtained the United States patent for this process in 1844, but when he applied for the British patent, he found that Hancock had beaten him to it. The term "vulcanized rubber" did not come from Goodyear, but was actually coined by a friend of Hancock's.

Did You Know?

The Goodyear Tire & Rubber Company, a well-known manufacturer of automobile tires and other rubber products, was founded by Frank Seiberling in 1898. It was named in honor of Charles Goodyear, although there are no family connections.

Applications of Vulcanized Rubber

Vulcanized rubber is currently used in a wide variety of products. Among the most common are:

  • automobile tires
  • rubber seals and gaskets
  • transmission belts
  • shoe soles
  • hockey pucks

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

By anon958615 — On Jun 28, 2014

In ancient Roman religion and myth, Vulcan is the god of fire including the fire of volcanoes. Vulcan is often depicted with a blacksmith's hammer.

By anon939097 — On Mar 12, 2014

"Hockey pucks are indeed made of vulcanised rubber and are then frozen so they glide more easily." They get frozen automatically when on ice.

By anon926529 — On Jan 19, 2014

What else can you use vulcanized rubber for?

By anon347879 — On Sep 11, 2013

Hockey pucks are indeed made of vulcanised rubber and are then frozen so they glide more easily.

By anon268510 — On May 14, 2012

Aren't hockey pucks made of vulcanized rubber?

By msaecdaily — On Mar 07, 2012

Check out the free online course about vulcanized rubber surfaces, at AEC Daily!

By anon244986 — On Feb 03, 2012

What country was vulcanized rubber made in?

By anon116256 — On Oct 06, 2010

anon77685-they should name a company after such a "freak" because if it wasn't for him they wouldn't be a company.

anon38161-think of just about anything rubber and that's a use. The soles of shoes, erasers, etc.

By anon77685 — On Apr 15, 2010

why should they name a tire company after such a freak?

By anon38161 — On Jul 24, 2009

What are the uses of vulcanised rubber

By anon8388 — On Feb 12, 2008

hi! i just have 1 question. how do you sulphurize rubber?

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