Get your gnarly pretreatment problems solved for good. The CPI Solution Squad is on the road again hosting technical workshops in a city near you. GRAB YOUR FREE REGISTRATION HERE – >


Unparalleled paint adhesion--without the sludge or hazardous waste.
Steelcote™ Zirconium-based pretreatment delivers superior paint adhesion and corrosion resistance without the sludge or hazardous waste of traditional phosphate systems.
- Pass all of your test specifications.
- Eliminate hazardous clean-outs.
- Maximize productivity.
- Keep the environment phosphate and heavy metal-free.
Unrivaled corrosion resistance for thermal management systems.
Contaminants in electric vehicle heat exchangers can erode battery life and create problems in HVAC systems.
- Extend battery life with our proprietary passivation technology.
- Eliminate contaminants and corrosion for optimal performance.
- Control microbial growth and get rid of unpleasant odors.
- Implement our proprietary aluminum passivation solutions for electric vehicles.




HVAC solutions
Not all lubricants are the same. We should know. We pioneered expansion lubricants specifically designed to expand aluminum tubing used in tube & fin heat exchangers.
Resources, Articles & Case Studies

Qualifying a New Pretreatment Supplier
Seeking a new pretreatment supplier? Jeff Blain of Circle-Prosco Inc. discusses considerations you should keep in mind when making this important decision.

Zirconium Pretreatment Offers Simplicity and Performance
Pretreatment supplier explores industrial, agricultural markets for phosphate-free solution.

An Interview With Douglas Parker, Circle-Prosco
Douglas Parker, owner and president of pretreatment, lubricant and cleaner business Circle-Prosco, discusses the company’s 50 years of success and its latest offerings.
Trusted by manufacturing leaders and engineers at the world’s best companies

Mike Clements, Operation Manager
Kingfisher Boats Inc
“The team at Circle-Prosco are who they say they are and live up to their promises….

Plant Manager
Global Agricultural Equipment Manufacturer
“I have trusted Circle-Prosco for close to 15 years in my pretreatment process…

Technologist
Leading Global Welding Manufacturer
“Our transition from iron phosphate to Steelcote™ was flawless. We resolved….
Solution Squad
Circle-Prosco’s Solution Squad has been solving the gnarliest manufacturing problems for more than 50 years.

Formulation
Our Solution Squad will work with you to determine the best chemistry for your unique processing needs. If you have unique or demanding requirements, we’ll even custom formulate a solution for you.

Testing
After formulating new solutions or selecting existing solutions, we will coat test parts and panels as part of our standard Solution Squad service. We can then perform numerous types of testing at our facility to quickly evaluate performance.

Trials
During a trial, the Solution Squad goes to your facility to make sure the process runs well. We run the trials according to your schedule, and we will even help you prepare your line.

Continued Support
After start-up, our Solution Squad isn’t done. We’ll evaluate your process on a regular basis, ensuring that it continues to run well. We also provide training for operators and engineers.

One Stop Shopping
CPI can recommend pumps, meters, and other control equipment. If desired, we can provide these items directly to ensure your service experience is friction-free.

Peace of Mind
If you have a problem anytime, day or night, you can get in touch with a technical service representative. Just call our general office number at (812) 339-3653. After normal business hours, a paging system will guide you.
Let's talk.
we answer every inquiry
We've been helping our customers solve their toughest problems for 50 years. If you’ve got a problem, chances are our Solution Squad has seen it and solved it before. #SeenItSolvedIt
- Schedule a free call with our Solution Squad.
- Email us directly: info@circleprosco.com
- Give us a call: (812) 339-3653