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Cove Plastics is Polymer Components' division specializing in injection molding, located in Dayton, Tennessee, and dedicated to serving our injection molding customers. With over 100 years of combined experience, we've tackled almost every kind of injection molding job imaginable.  With our experience, we'll keep your job on time and on budget.

  • Custom Injection Molding

  • Many Materials including TPUs

  • Accepts Existing Molds or Helps Make One

Tennessee Based Injection Molder

How Our Injection Molding Can Help Your Business

  • Low Piece Price

  • Fast Turnarounds

  • Extremely High Quailty

  • Small to Large Parts

  • Wide Material Selection

  • Mold Making / Design


Polymer Components prides it's self on versatility. We excel at injection molding with dozens of materials and material variation. Here is a sample list of some of the materials we frequently use:

  • ABS (Acrylon Butadiene Styrene)

  • Acetal (Polyoxymethylene or POM)

  • HDPE (High-density Polyethylene)

  • Nylon (Standard & Glass Filled aka PA)

  • PC (Polycarbonate)

  • PBT (Polybutylene terephthalate)

  • PET (Polyethylene Terephthalate)

  • PS (Polystyrene) *Solid Variation Only

  • PP (Polypropylene)

  • PPE (Polyphenylene Ether)

  • TPE (Thermoplastic Elastomer aka TPR)

  • TPO (Thermoplastic Polyolefin)

  • TPU (Thermoplastic Polyurethane)

  • SAN (Styrene-acrylonitrile resin)

  • and more


Cove Plastics has nearly two dozen injection machines spread across two locations. Our injection machines can accommodate up to 80 ounces (2270 g) shots and our clamping pressures run as high as 550 tons. With our vast machine variation and inventory, Polymer Components can accommodate low or high volume runs and in dozens of materials.

Already have a mold? Great, we can use your existing molds in our system and save you money. Our tie bar spacing sizes range from 14" x14" (355.6mm x 355.6mm) to 33" x 31" (838.2mm x 787.4mm). For anything larger please call and ask for more information. 


Don't have a mold? No problem, along with our state-of-the-art molding facility, we boast an equally robust machine shop. From mold design to production, Polymer Components can help every step of the way in creating an injection mold for your company.   

More info

  Polymer Components created a dedicated division to injection molding because we know injection molding requires a targeted focus to master. Cove Plastics was founded in 1994 and only produces high-quality injection molded parts. You have access to a highly experienced staff from mold designing engineers to materials specialties. We believe we can help in any step of the parts cycle, from design to mass production. If you need low tooling costs, Polymer Components cast molding services can help, or if you are ready to lower your per-part price our injection molding services are the way to go. We produce parts in dozens of materials. See our materials page for more information. 

  Our injection services are used in many different industries from medical to energy production and more. We specialize in producing parts tailored to your application's needs. Need a quality part that can stand harsh outdoor conditions or maybe the part needs to be near-frictionless, we know exactly how to help. So, request a quote today and give us a chance to with you and make something great. 

Answers to some of the web's most common questions:

Why use injection molding?

Injection molding is perfect for large volumes or complex parts. Once the initial costs of an injection mold are paid, the piece price drops dramatically. Scrap rate is also reduced which lows production costs and is better for the environment.

Injection Molding vs Cast Molding?

The biggest differences can be categorized in a few ways:

Mold Type: Injection molds are typically metallic and require CNC machines to form while Cast can be done with non-metallics like urethane and silicon. This difference in mold requirements means injection molding is more expensive upfront but cheaper in the long run due to a lower piece price.

Piece Price: Injection molding has fast cycle times and most molds have many cavities. The volume and cycle time usually leads to lower costs per part than cast

Process: Injection molding uses machines to shot material into the mold at high temperatures while cast utilizes gravity to pour the material into the mold. Depending on the material, this means wall thickness can be thinner via injection than cast.

Lead Times: Steel injection molds take more time to develop meaning it may be 7-10 weeks for production can start. Cove Plastics utilizes Polymer Components' in-house machine shop to reduce these times when applicable, however for these reasons cast molding typically yields quicker turnarounds. 

Can injection molding be done with recycled plastics?

This depends are material selection but yes! Many plastics or elastomers can be ground down and recycled. Ask us more during your RFQ submission.

Are there injection molding companies near me?

Injection molders are around the country. Cove Plastics operates out of Dayton, TN. Geographic location is important in injection molding for logistics. Cove Plastics resides on highway 27 with a direct route from Dallas, TX to New York, NY for easy shipping.

What areas does Cove Plastics serve?

Cove Plastics is a Tennessee-based company however we serve the world!. Cove Plastics has clients all over the US and internationally as well but some of our most common locations are: Lousiville, KY  Chattanooga, TN  Atlanta, GA  Charlotte, NC  Nashville, TN  Memphis, TN  Greensboro, NC  Columbus, OH  Indianapolis, IN Cincinnati, OH  Orlando, FL and Jacksonville, FL. 

Injection Molding vs Blow Molding?

Blow molding is used for products with extremely thin walls and hollow interiors, like plastic water bottles. While injection molding is used to create ridge solid parts.

Injection Molding vs Extrusion?

Extrusion is a process revolving around pushing material through a 2D die-cut to create a continuous piece that can be later cut to length, think string in this case. Injection molding creates 3D parts that may or may not contain complex geometry. Both processes produce scrap that can be recycled however each process serves a different niche.



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