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polymer molding caps and plugs

An Innovative Manufacturer of Polymer Injection Molded Parts

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Parts Developed to Your Specific Needs and Applications

We have the experience and craftsmen in house to produce unique solutions that meet or exceed the most stringent specifications. We provide the technical and tooling support you need to take your polymer injection molding project from a concept idea right through to production.


Whether you need plastic injection molded parts bagged in small quantities and labelled for resale, modified to meet your specific need, or fitted with hardware before shipping, our secondary operations department can save you valuable time and money. Let us do the work, so your employees can be focused where you need them most.



Polymer Molding Inc. (PMI) is an American owned and operated plastic injection molding manufacturer and global supplier that specializes in the custom design and production of protective coverings, closures, and components. With fully staffed tool-building, prototype and mold-maintenance departments on site, we have the means and expertise to create the best customized plastic injection molded parts for any protective need. We also have a wide selection of industry-standard caps, plugs, netting, components and inserts that provide simple, reliable, and cost-effective protection from contamination and shipping damage. Free samples are available upon request.


When you call Polymer Molding Inc. during normal business hours, your call will be answered by a live person, every time. It is our sincere commitment to lead the market in exceptional customer service, because you deserve to do business with a company that truly cares about you and your product needs. Our knowledgeable, friendly and helpful sales and customer service representatives will take the time to help you select the best parts for your applications at the most competitive prices in the industry. We are here to answer questions, process your orders, and prepare your shipments quickly and efficiently. Compare our pricing and see the Polymer Molding difference.

see what our customers are saying about us
“Very happy with all aspects of PMI. True professionals…from Sales to Shipping Dept. Keep up the good work! Thanks!”

~Jack E., Ohio

“Great company! Quick responses and awesome customer service!”

~Daniel S., Colorado

“Jane Andrews knew the product very well and even shipped samples so we could get the correct product.”

~John M., Colorado

“Your service is great and our Sales Rep, Tarra Griffith, is so very helpful. She always responds to my emails promptly and has been patient with me as I transitioned into purchasing! Your products are always clean and debris free. Thank you.”

~Amanda L., Ohio

“Mindy provides excellent customer service. She processes my orders so fast and is very attentive to any needs. It’s a great business relationship I am glad to have!”

~Michelle R., Ohio

“Each time I have placed an order with Polymer Molding, I have had excellent customer service and extremely good delivery. The last two orders I have placed, I have worked with Tarra Griffith – she has been outstanding. Thanks for the great work and a great product.”

~Rachel B., Ohio

“A great team to work with. Everyone is helpful and willing to go the extra mile to help and to find the product needed. When there is a problem, it is resolved efficiently.”

~Lou H., Indiana

“I had a great experience ordering a product, discussing the potential options, and following-up with billing items. It was a completely excellent experience. Thank you!”

~David V., New York

“I can’t say I have any suggestions for improvement as my experience with ordering went smoothly. Keep up the good work. Little things like quick responses as well as confirmation emails really made things great.”

~ Alex D., Ohio

“I work with Mindy Dottore on a near-daily basis and she is great to work with. The level of service provided by PMI through Mindy is really unmatched in comparison to my many other suppliers. I really appreciate the effort she makes to keep us happy and fulfill any special requests I have and I sincerely hope that she never leaves PMI!”

~Mark J., Ohio

“I was pleasantly surprised to find that every time I’ve called your business, someone directly answers the telephone. All of your representatives also have a great phone voices, great etiquette and handled all of my affairs with great efficiency and fervor. Thank you for the opportunity to share my satisfaction. Have a good day.

~Mark H., Michigan

“I can’t think of any suggestions for improvement. The Customer Service personnel are very friendly and very helpful and efficient. The plant really likes the product and the pricing is very competitive. Please always keep a customer service group that one can call and place orders with. Don’t go to all computerized like some larger companies are doing: more mechanical than interactive with no personal touch. Business should be about relationships. That’s the glue. Some companies make it almost impossible to talk with a live person.”

~Charlotte W., Oklahoma