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Welcome to KASO


Celebrating 50 years since 1962KASO Plastics is your full-service custom plastic injection molder in the Portland-Vancouver metro area.

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!

Professional Engineers Working With You

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 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 Plastics Injection Molding Services, Long and Short run production

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 capabilities and services.

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.

KASO Plastics Engineering services, mold flow analysis, material selection

Quality Assurance & Control

Quality Assurance: KASO employs a full-time Management Representative to oversee and manage the effectiveness of our quality system. With a strong company culture of utilizing systems for the benefit of KASO as its customers and a strong internal auditing system KASO Plastics has maintained its ISO registration since 1999.

Quality Control: Our investment in a fully equipped metrology lab, experienced technicians and inspectors that operate within a strong quality system 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's Personalized Service

Our quality assurance is our method of promoting efficiency and quality for all our products. Our administrative and procedural activities express our company's culture and desire to be the best we can be, and provide the highest quality service injection molding and product supplies.

Customer Focus

We are dedicated to exceeding customer expectations regarding quality products, and quality of customer interactions. 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.

Customer Satisfaction

Our goal at KASO, is to deliver the highest level of customer satisfaction, and we pride ourselves in understanding what our customers need for their businesses. It is our desire to establish and maintain customer relationships based on equality and communication, providing value to each customer interaction.

KASO Plastics injection molding customer service, quality assurance and control