Plastic Injection Molding

Your Trusted Partner in Precision Molding

From small components to large structural parts, PSI Molded Plastics delivers precision, consistency, and proven expertise in injection molding, structural foam, and gas assist technologies.

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About PSI Molded Plastics

With facilities in Indiana, New Hampshire, and South Carolina, PSI Molded Plastics is a trusted partner for complex, high-quality injection molded solutions—from small precision parts to large, high-aesthetic components.

Our full range of capabilities includes:

Standard injection molding
Structural foam and gas assist molding
Gas counter pressure molding
Custom finishing, painting, and EMI shielding
Assembly, graphics, and integrated secondary services

For over three decades, leading companies in automotive, healthcare, appliances, filtration, material handling, sports & leisure, industrial, and lawn & garden have relied on PSI for more than just molded parts. We deliver consistent quality, engineering support, and single-source convenience that reduce complexity and keep production moving.

At PSI, we combine technical expertise with personal service—ensuring every project meets the highest standards of performance, durability, and value.

200+

Years Experience

450+

Employees

350K+

Sq.ft. of space

Excellence in Quality Award

GI Plastek Wolfeboro, 2016

Meet Our Clients

Capabilities

Overview

Comprehensive Capabilities. Proven Results.

At PSI Molded Plastics, we deliver end-to-end injection molding solutions—from small precision parts to large, complex components—supported by capabilities rarely found under one roof. With more than 100 presses ranging from 22 to 1,574 tons (soon expanding to 2,100 tons) and shot sizes up to 31 lbs., we offer unmatched versatility in custom injection molding, including standard injection, gas assist, structural foam, insert molding, and over-molding. Beyond molding, our in-house finishing services—painting, EMI/RFI shielding, decorating, assembly, laser etching, custom packaging, pad printing, and hot stamping—provide the convenience of a true single-source partner for high-quality, production-ready parts.

Small Part Injection Molding

High-precision small part molding with tight tolerances, efficient automation, diverse materials, cost savings, and consistent quality at scale.

Large Part Injection Molding

Specialized large-part molding up to 31 lbs., with structural foam, gas-assist, robotics, and full finishing for competitive efficiency.

Structural Foam Injection Molding

Lightweight yet strong molded parts with reduced stress, thick sections, and lower tooling costs—ideal for large, durable applications.

Gas Assist Injection Molding

Creates strong, lightweight parts with tubular structures, superior surface finish, and design flexibility while reducing material use and weight.

Secondary Processes

Comprehensive secondary services—from assembly and EMI/RFI shielding to painting, decorating, welding, and packaging—delivering turnkey, cost-effective manufacturing solutions.

Markets

Some of the markets we serve. (On mobile devices, tap a tab then scroll down for details.)

Appliances

PSI delivers precision-molded components that enhance both performance and design in modern appliances. From functional parts to aesthetic finishes, PSI supports high-volume production with consistency.

Our engineering expertise ensures complex appliance parts are manufacturable, reliable, and cost-efficient. From structural elements to cosmetic surfaces, PSI helps manufacturers bring innovative products to market.

Durable, heat- and chemical-resistant materials
Aesthetic finishes for consumer appeal
High repeatability for large production runs
Lightweight components without sacrificing strength

Automotive

Automotive applications demand precision, durability, and cost efficiency—PSI provides molded parts that meet strict industry requirements with proven quality systems and certifications.

From interior components to structural parts, PSI supports automotive OEMs with scalable production, in-house finishing, and engineering collaboration to streamline product launch and performance.

Structural foam and gas-assist for weight reduction
Complex geometries with high repeat tolerances
Reduced stress and improved insulation properties
Post-molding assembly and painting

Filtration

PSI supports the filtration industry with components designed for precision fit, durability, and compatibility with demanding operating environments. Injection molding ensures consistent performance at scale.

Whether for industrial, residential, or specialty filtration, PSI provides molded parts that integrate seamlessly into customer systems, delivering reliable results over long service lifetimes.

Lightweight yet strong structural options
Custom finishing for functional and visual needs
Material versatility for specific applications
Engineering collaboration from concept to production

Healthcare

From housings to functional components, PSI combines engineering support with scalable production, enabling healthcare OEMs to deliver trusted devices and equipment to global markets.

PSI provides precision molding solutions for healthcare, supporting high standards of safety and reliability. Our expertise ensures parts meet regulatory requirements while remaining cost-efficient.

ISO and IATF-certified facilities
Materials tailored for medical compliance
Dimensional accuracy with FARO Arm inspection
High-volume repeatability

Industrial

Industrial applications demand strength, consistency, and scalability—areas where PSI excels. We support large and small molded parts with a full suite of post-molding services.

With deep experience in complex applications, PSI ensures industrial OEMs get parts that deliver strength, repeatability, and cost savings across the full product lifecycle.

Press range from 22 to 2100 tons
Robotics and automated production for cycle efficiency
Lower tooling costs through optimized designs
Enhanced stiffness-to-weight ratios

Lawn & Garden

PSI manufactures rugged components for lawn and garden equipment, delivering durability, weather resistance, and reliability in demanding outdoor applications.

Our molding capabilities support everything from housing components to functional parts, helping OEMs build equipment that balances performance, longevity, and cost efficiency.

High-strength materials for outdoor use
Structural foam for weight reduction
Consistent large- or small-volume runs
UV- and impact-resistant finishes

Material Handling

PSI specializes in producing rugged, large-format plastic parts essential for material handling equipment, combining structural integrity with lighter weight to reduce overall machine load.

Whether for forklifts, carts, or handling systems, PSI delivers robust solutions that withstand demanding environments while optimizing cost, durability, and ease of manufacturing.

Presses up to 2100 tons for large parts
Reduced stress and improved stiffness-to-weight ratios
In-house finishing and assembly services
Structural foam and gas-assist molding

Sports & Leisure

PSI supports sports and leisure markets with lightweight, durable components designed for performance, aesthetics, and consumer appeal. Injection molding delivers consistent quality at scale.

From equipment housings to recreational components, PSI blends design expertise with scalable production to help brands deliver innovative, competitive products to market.

Materials engineered for strength and flexibility
Tight tolerances for performance parts
Lightweight structural solutions
Decorative finishes for branding

Contact

We look forward to talking with you.

Locations

PSI North 3615 Voorde Dr., South Bend, IN 46628

PSI East 5 Wickers Dr., Wolfeboro, NH 03894

PSI South (HQ) 4900 Highway 501, Myrtle Beach, SC 29579

PSI South 2823 Gurley Road, Marion, SC 29571

Email

info@psimp.com

Call

(603) 569-5100