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More Info

More Info

More Info


Polymer Components created a dedicated division for 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 medicine to energy production and more. We specialize in producing parts tailored to your application's needs. Need a quality part that can withstand 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. The scrap rate is also reduced which lowers 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 lead to lower costs per part than cast


Injection molding uses machines to shoot 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 take 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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