Factory plastic injection molding machine.

Custom Plastic Injection Molding Solutions

With over 39 years of experience, Mountain Mold & Die specializes in custom plastic injection molding, using a highly specialized process that includes precise material preparation, consistent machine and environmental parameters, and accurate tooling to meet part specifications. We work with a wide range of materials, including PC, ABS, PP, PE, POM-Acetal, PA-Nylon, PBT, HDPE, LDPE, TPE, TPO, TPU, and PEEK, incorporating fillers, reinforcement fibers, colorants, and property modifiers as needed. Our innovative over-molding process allows for elegant part geometry, including chemical bonding, which was previously impossible with traditional attachment methods.

Innovative Plastic Injection Molding Solutions

Since 1996, we've led the industry with ingenious solutions, such as over-molding glass RFID transponders in automotive keys. Our consistent process control ensures the highest quality, from machine parameters to environmental factors, maintaining the integrity of each part. We offer custom plastic injection molding services with shot capacities up to 20 oz., as well as plastic and metal insert molding and over-molding, using custom blend materials and colors. Following are the molding capacities of our equipment:

  • 250 tons: Tie Bar Clearance: 22 in. Shot Size: up to 20 oz.
  • 200 tons: Tie Bar Clearance: 20 in. Shot Size: up to 14 oz.
  • 150 tons: Tie Bar Clearance: 17 in. Shot Size: up to 8 oz.
  • 100 tons: Tie Bar Clearance: 16 in. Shot Size: up to 3.5 oz.
  • 50 tons: Tie Bar Clearance: 11 in. Shot Size: up to 3 oz.
Teal plastic injection molding machine.

In-Mold Assembly

Many of our injection molded products, including those created through reinforced plastic injection molding, are assembled in-house, with some even being assembled directly at the press during the molding process. This seamless integration of molding and assembly is a natural evolution for custom injection molding companies. We began using innovative material properties, including chemical bonding in the over-molding process, to create elegant part geometries that were previously impossible with traditional attachment methods. Our journey started in 1996, when we developed a solution for over-molding an automotive key with an RFID transponder. Over the years, our ability to provide creative and efficient solutions has made us an industry leader in this field.

Insert Overmolding Molding Solutions

Plastic Insert Overmolding combines small parts of various materials into a single component by injecting plastic around an insert placed in the mold cavity. Common applications include:

  • Metal bushings, levers, tubes, and studs
  • Electronic components like RFID housings and LED connectors
  • Medical devices such as needle hubs and rehab products
  • Tools with soft grip handles
  • Knobs for appliances and mechanical parts
Factory machinery and large white bags.

Materials Used for Overmolding

  • Polyethylene
  • Polypropylene
  • Polyvinyl chloride (PVC)
  • Thermoplastic elastomers (TPE)

Benefits of Plastic Insert Molding

  • Lower labor and assembly costs
  • Increased reliability
  • Reduced size and weight
  • Greater design flexibility
Blue industrial machine close-up.

Molding Solutions for You

Ready to explore our range of plastic injection molding solutions? Whether you need custom parts, in-mold assembly, or insert overmolding, our products are designed to meet your specific needs.