Tessenderlo Kerley, Inc. (TKI)

Tessenderlo Kerley, Inc. (TKI) produces and markets specialty chemical solutions, including fertilizers, crop protection chemicals and process chemicals and services to markets worldwide. Operating nine manufacturing plants in North America, and one each in Belgium and Turkey, TKI delivers products through an extensive terminal network across the globe. TKI is a subsidiary of the Tessenderlo Group, Brussels, Belgium. Tessenderlo Group is a worldwide specialty company, focused on food, agriculture, water management and on valorizing bio-residuals.

Company details

2255 N 44th Street, Suite 300, P.O. Box 15627 , Phoenix , 85008-3279 Arizona USA

Locations Served

Business Type:
Industry Type:
Market Focus:
Globally (various continents)
Over 1000
10,000,000 - 100,000,000 €

This company also provides solutions for other industrial applications.
Please, visit the following links for more info:


Concentrating on niche segments, TKI's NovaSource business unit serves the regulated chemical market in the areas of agriculture, horticulture, turf, forestry, aquatic, structural pest control and biocides in the United States and worldwide.
Through two subsidiary companies, MPR Services and Tessenderlo Kerley Services, TKI also provides engineering and construction services to oil and gas sector customers and offers amine and glycol cleaning, and related services to refinery and gas plant customers.
TKI's specialty fertilizer solutions dominate the world's broad acre, fruit and vegetable markets. In plant nutrition, the common link for several of TKI's key nutritional products is the thiosulfate molecule.
TKI is a leader in the slow release nitrogen market with the N-Sure brand, a triazone-based solution widely used in many crop nutritional programs.
TKI is the world's largest producer of metam-based fumigants. With the acquisition of the Sectagon 42 brand of metam sodium in 1999, TKI entered the crop protection sector that led to the creation of the NovaSource business unit, to develop and market regulated crop protection chemicals.
Tessenderlo Kerley Formulators (formerly Ag Formulators) became part of Tessenderlo Kerley in 2007, offering toll-processing formulation and secure warehousing to expedite customer manufacturing and marketing.
TKI is a key unit of Tessenderlo Group, a Belgian-based multi-billion (USD) international specialty group founded in 1919. The group provides solutions for global needs in food, agriculture and water management and primarily serve customers in construction, agriculture, industry and health and consumer goods end markets.
Its fields of expertise are:

  • Sulphur-based specialty fertilizers, sulfur derivatives and crop protection
  • Gelatin and processing of Bio-residuals
  • Potassium Sulphate fertilizers and Feed Phosphates
  • Plastic Pipe systems and Profiles
  • Water treatment products and services, organic chlorine derivatives, intermediates and active ingredients for the pharmaceutical industry and compounds

Tessenderlo group employs more than 7,000 people at over 100 locations across 22 countries, making it a worldwide presence and a global market leader in many of its products areas.
TKI's capabilities were designed to serve you.
TKI employs a global network of formulation technologists, active ingredient suppliers, and specialized marketing partners, all with unique capabilities to develop exceptional product offerings. Teams of technical and administrative professionals work together in strategic geographic locations and within diverse business units.
As part of Tessenderlo Group, Tessenderlo Kerley has the resources to continue developing quality products that complement their core business delivering...
a tradition of innovative solutions.


TKI began with an idea.
The Kerley Chemical Company (now TKI) was founded more than 60 years ago in Texas, on both science and ingenuity. At a time when most natural gas plants in West Texas flared hydrogen sulfide, the Kerley brothers were able to turn this common byproduct into a successful business.
With their first plant in Pecos, Texas, they extracted elemental sulfur from the hydrogen sulfide byproduct. TKI was off the ground, selling sulfur-based fertilizers throughout North America. Today, TKI is a world leader in the production and marketing of specialty chemistries used in the agriculture, mining and process chemical industries.
TKI's core remains the same.
In late 1995, Tessenderlo Chemie acquired the Kerley business. But the core and basis of the company remains unchanged — to focus on processing by-product sulfur and ammonia gases from petroleum, gas and selected industrial operations, and turning these orphaned streams into added value products. TKI does this selectively to balance their environmental control offering with the supply and penetration of end markets for their ammonia and sulfur derivative products to agriculture, mining, water treating and industrial segments.


One important joint venture
The environmental services provided in processing off gas is typically characterized by long term service contracts, with TKI investing in turnkey facilities based on TKI expertise. One such joint venture is with Phillips 66, just completing its 26th year. At two key refining facilities, TKI processes 100% of the hydrogen sulfide gas. Close coordination and high service levels are characteristic of these service relationships.
TKI is a world leader in sulfur and thiosulfate chemistry and in introducing and promoting the application of these derivatives into commercial uses. The largest existing end market is agriculture.
The menu of products produced by TKI has other niche uses in a wide variety of industrial, mining, municipal, environmental and water treating applications. TKI works to promote logical and beneficial uses for the products produce and offered.
Another key acquisition
TKI acquired the business of Mobile Process Resources (MPR) in 1999, which had technology to assist oil refineries with providing a more efficient way to operate equipment designed to separate gases within the refining process. MPR offers technically advanced mobile and permanently installed equipment for the cleaning and recovery of gas treating solutions, world wide. MPR has expanded these technologies to have applications in gas plants, ammonia plants, steel manufacturing and LNG facilities.
NovaSource is formed.
With its close ties to world agriculture markets, TKI had another success in late 1999 with the purchase of a metam-sodium label and production facility. TKI formalized its efforts in developing and distributing regulated crop protection and ladled chemistries with the new NovaSource business unit in 2007. NovaSource serves all areas of regulated chemical market including agriculture, horticulture, turf, forestry, aquatic, structural pest control and biocides. This business group works to selectively expand and add proven labelled product lines to the company's portfolio and has been a key area of growth and investment for TKI in recent years.
Expertise in toll-processing and warehousing
Tessenderlo Kerley Formulators (formerly Ag Formulators) became part of Tessenderlo Kerley in 2007, offering toll-processing formulation and secure warehousing to expedite customer manufacturing and marketing.
An eye to the future
TKI serves their markets through 10 manufacturing plants and 60-plus terminals in key areas, delivering remarkable products that offer a smart, stable business opportunity for customers and marketing partners.
TKI continues to evaluate and expand using its technology and expertise in adjacent markets, where end markets have evolved and matured to be receptive to the existing and future product offering.