Matheson Tri-Gas, Inc. produces industrial, medical, and specialty gases, and associated gas handling equipment, in North America.

In addition, the company provides support, engineering, and systems management services to analytical laboratories and semiconductor manufacturers worldwide.

Among Matheson's more notable accomplishments are the development of the lecture bottle, now used by virtually every major college and university in the world; and the supply of ultra-pure gases that served as standards for the first gas chromatographs.

In 1966, MATHESON acquired Grey Chemical of Gloucester, Massachusetts, USA, a producer of ultra-pure gas materials used in electronics manufacturing.

In February 2015, MATHESON continued its expansion in Southern California and Hawaii with the acquisition of Sims Welding Supply and assets and operations of Air Liquide America LP, respectively.

WIth the acquisition of the divested HyCO business at Linde (agreed to as part of the Linde-Praxair merger in 2019), MATHESON builds and operates hydrogen production plants globally.