machine to make plastic molds

Custom Blow Molded Plastic for Cases, Product Packaging & More

Custom blow molding is a manufacturing process that produces hollow plastic products with complex geometries. This process is widely used in various industries such as medical, aerospace, transportation, and general industrial markets. The advantages of blow molding include low tooling costs and the ability to produce one-piece, single-wall or double-walled constructions with a complex or irregular shape.

During the blow molding process, an extruded plastic tube is inflated to form the shape of a mold. Virtually any thermoplastic or thermoset polymer can be blow molded. However, HDPE (high-density polyethylene) is the most commonly used material for this process. The process involves continuous extrusion blow molding, where a parison (a hot tube of plastic material) is dropped from an extruder and then entrapped in a water-cooled mold. When the mold is closed, air injects through the neck of the container, like blowing up a balloon. The mold is released, and the part is revealed.

Custom blow molding is a fast, stable, and repeatable process for manufacturing hollow products with complex geometries. It is a cost-effective solution for producing large quantities of plastic products with consistent quality. The process is highly customizable, allowing manufacturers to produce a wide range of products with varying shapes, sizes, and materials. With the latest technology and equipment, manufacturers can produce high-quality plastic products that meet the specific needs of their customers.

Custom Blow Molded Plastics & Carrying Cases
blow molded plastic products
medium sized custom blow molded plastic products
large assortment of blow molded plastic products
custom blow molded plastic bottles
We use single and multi-headed machines, process multiple resins, and utilize machines from 1 oz to 15 lbs.

Understanding Custom Blow Molding

Custom blow molding is a plastic manufacturing process for creating hollow parts with complex geometries. It’s a fast, stable, and repeatable process with low tooling costs, making it ideal for low to medium volume runs. The process is versatile, working with various materials such as PET, HDPE, LDPE, PP, PVC, etc. It involves heating plastic, blowing it into a mold cavity, and producing one-piece constructions. Types of custom blow molding processes include injection blow molding, stretch blow molding, and extrusion blow molding.

The process consists of three stages: design, production, and finishing. In the design stage, a 3D CAD or e-drawing is created, specifying plastic type, size, shape, and special features. The production stage starts with creating a parison, then placing it in a mold, blowing air into it, and cooling. The finishing stage involves removing excess plastic, adding finishing touches, and inspecting the product for quality.

19 by 14 by 4.75 plastic blow molded case

Why Choose Blow Molded Products

Blow Molded Products has been an industry leading molding company for years, but what makes us different from our competitors?

You no longer have to pick and choose different companies to manufacture your different product lines. We are a one-stop-shop, providing custom mold design, manufacturing, or if you need to produce hundreds of thousands of stock-sized bottles or blow molded cases as soon as possible, Blow Molded Products can help. We prioritize start-to-finish quality, and our engineers handle everything in-house.

Located in Riverside, California, our state-of-the-art facilities are capable of single and double-wall industrial blow molding, custom engineering and design, and offer a diverse product line to choose from for short or long production runs of numerous plastic products.

Now that you know a little about us, give us a call so we can learn more about your company, product specifications, and production needs! If you’re not in the U.S., ask about our international shipping!

New to blow molding? Learn more about the process in our helpful post, What is Blow Molding?


Curious about if blow molding is right for your project? Learn more about the pros and cons of blow molding here!

Blow Molded Products is committed to environmental sustainability, and we feel it’s important to know the impact of using various plastics. Learn more in our post, Are Blow Molded Plastics Recyclable?


Ever wonder what the differences between blow molding and rotomolding are? Learn more here!