The Standard For Performance and Quality
The process of achieving a superior quality finish starts with a quality pretreatment process. The high-performance washers from Midwest Finishing are the perfect foundation for your finishing system. Proper pretreatment helps to ensure excellent paint adhesion, increase finish quality, prevent corrosion, and improve salt spray performance. Our pretreatment washers maximize value and are built to last with premium components, expert workmanship, and the industry's most energy efficient operation.
Washer Features
Midwest Finishing pretreatment washers range from simple single-stage modules to large multi-stage systems depending on the part's soil level and required coating quality. They are built in modular form for quick installation and less downtime in your facility. We incorporate stainless steel parts for durable performance and long life providing distinct advantages over composite and polypropylene washers. Our exclusive insulation packages are designed to save up to 49% on your system's energy usage over non-insulated equipment.
- Unique modular design with quick installation
- Factory tested prior to shipment
- Modules arrive on-site pre-wired and plumbed
- Long life stainless steel components
- Smooth wall interior
- Insulated tanks & upper housing
Check out additional finishing system components:
What is a pretreatment washer in a powder coating system?
A pretreatment washer is the first major process in a powder coating system. It removes oils, dirt, machining fluids, and other contaminants while preparing the metal surface for powder application. Proper pretreatment improves powder adhesion, enhances finish quality, and significantly increases corrosion resistance and long-term durability.
Why is pretreatment important before powder coating?
Pretreatment creates a clean, chemically prepared surface that allows powder coating to bond properly to the metal. Without proper pretreatment, coatings are more likely to experience adhesion failures, premature corrosion, blistering, or peeling. A properly designed pretreatment process is one of the most important factors in achieving a high-quality, long-lasting finish.
How many stages does a pretreatment washer need?
The number of pretreatment stages depends on the substrate, contamination level, corrosion protection requirements, and customer specifications. Some applications require a simple single-stage cleaning process, while others use multi-stage systems with cleaning, rinsing, phosphate or zirconium conversion coating, sealing, and final rinses to maximize coating performance.
What are the benefits of a modular pretreatment washer?
Modular pretreatment washers reduce installation time because they are factory assembled, pre-wired, and pre-plumbed before shipment. This approach minimizes disruption at the customer's facility, simplifies installation, improves quality control, and allows for easier future expansion as production needs grow.
How does a pretreatment washer improve corrosion resistance?
A properly designed pretreatment process removes contaminants and applies a conversion coating that enhances powder coating adhesion and protects the metal substrate. This significantly improves corrosion resistance, increases salt spray performance, extends product life, and helps finished parts withstand demanding indoor and outdoor environments.
