Four Process Ltd.

Request A Quote

Valley Park, MO  |  636-677-5650

Four Process is a custom plastic injection molder supporting customers from start to finish – concept, design, prototype, production and warehousing. For more than 45 years, the company has taken a proactive and hands-on approach to customer service helping clients solve problems while delivering solutions the industry needs.

• Flexibility to manage short-, medium- and long-runs.
• Precision injection molding capabilities delivering quality products on time.
• Custom inventory management to quickly fulfill customer orders.
• On-site production capabilities delivering a one-stop shop for assembly, component sourcing, fabrication, specialized packaging and more.

The drive to be more than just another injection molder is found throughout Four Process’s woman-owned small business, from the shop floor to the offices. It’s fueled by the company’s four pillars:

1. Communication – The more the better to ensure that together, we are on the path to success.
2. Honesty – We do not just tell you what you want to hear, but more importantly, what you need to hear.
3. Value – We are dedicated to ensuring it’s a part of everything we do – products, services, insight
4. Reliability – We say what mean and do what we say!
“Four Process is not just a supplier to Rug Doctor, they are a dedicated and valued partner. The entire team at Four Process is great to work with and are always willing to take on new projects and challenges to help a customer in need.”
— Alicia McCoy, Rug Doctor

For more information on how Four Process can help address your plastic injection needs, visit our website or email at

Injection Molded Plastics Power Pages

Plastic Gears

Plastic Gears

A plastic gear is a toothed wheel made up of engineering plastic materials that work with others to alter the relation between the speed of an engine and the speed of the driven parts. The engineering plastic materials used in manufacturing plastic gears can be...

Plastic Injection Molding

Plastic Injection Molding

Plastic injection molding, or commonly referred to as injection molding, is a manufacturing process used in the mass fabrication of plastic parts. It involves an injection of molten plastic material into the mold where it cools and...

Thermoplastic Molding

Thermoplastic Molding

Thermoplastic molding is a manufacturing process that works to create fully functional parts by injecting plastic resin into a pre-made mold. Thermoplastic polymers are more widely used than thermosetting...

Plastic Molding Processes

Featured Industries