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Welcome to KASO

Your Custom Injection Molder in Portland and Vancouver

Celebrating 50 years since 1962

Take advantage of the many benefits you'll receive with KASO's state-of-the-art injection molding equipment and skilled plastics engineering and manufacturing staff and ensure your high quality, close-tolerance injection molded products are manufactured at globally competitive prices.



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New Opportunities for 3D Printing and Short Run Production

3D Printed Plastic Part

Lighter weight, cheaper options for those looking to test out new product designs or to produce small batches of injection molded parts.

What does that mean for businesses today? It means 3D printing can be an excellent alternative to injection molding for short run production.

Start a Short Run Project Today!

KASO Plastics Offers Short Run Production

Injection Molding Services

Our 50,000 sq. foot state-of-the-art plastic injection molding facility houses injection molding machines ranging from 55 to 610 tons. The machines are equipped with 3-axis servo robots for improved part quality, process consistency, and labor reduction. Fully mobile auxiliary equipment, central drying system, and overhead cranes keep KASO equally prepared for long and short run production alike.

View all of KASO's Injection Molding Services.

Engineering Services

Our seasoned engineering team utilizes our Early Supplier Involvement (ESI) process to bring design for manufacturability, mold design, mold flow analysis, material selection, cost reduction concepts and many more advantages to your design long before manufacturing is completed. With years of practical injection molding experience here in Washington, combined with our constant focus on finding fresh, new and innovative ideas, our experienced staff welcomes new challenges. More information on KASO's Engineering Services..

Engineering Focused Molding

Learn more about our injection molding services and processes that include gas assist injection molding, in-mold decoration, structural foam molding and more.

KASO's Custom Services

KASO's injection molding services include custom molding, precision machining, and rapid prototype components, with a focus on your specific needs and features in mind. Our specialized processes and machinery allow us to provide our customers with exceptional quality and the most competitive prices in the industry.

Quality Assurance

Quality Assurance: KASO employs a full-time Management Representative to oversee and manage the effectiveness of our quality system. KASO Plastics has maintained ISO registration since 1999.

Quality Control: Our investment in a fully equipped metrology lab, experienced technicians and inspectors continues to yield excellent results.

"KASO is dedicated to meeting customer requirements, our goals are to continually improve quality, on-time delivery, and to reduce costs."

KASO Plastics Injection Molding Services, Long and Short run production

Customer Focus

We are dedicated to exceeding customer expectations. Our state of the art injection molding facility, pictured below, operates 24 hours under the guidance of our skilled and experienced workforce, ensuring your project receives the focus it deserves.

KASO Plastics injection molding customer service, quality assurance and control