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Last updated: January 2026
This directory lists 53 thin wall molding companies across the United States, from specialized medical device molders to high-volume consumer goods producers.
Buyers in this category are typically solving for critical challenges such as lightweighting, material reduction, and faster assembly in diverse applications like packaging, medical diagnostics, and consumer electronics enclosures. This involves navigating complexities like maintaining critical wall thickness uniformity across large surface areas, preventing warpage during rapid cooling, and achieving extremely fast fill times without inducing excessive material shear or internal stress.
Supplier types in this space vary significantly. Some specialize in ultra-thin walls (e.g., under 0.5mm) for high-performance engineering polymers, while others focus on high-cavitation tools for packaging or high-volume disposable medical components. Distinguishing characteristics often include their core competencies in rapid cycle times, precision tolerance control, specific material expertise (e.g., bio-resins), or integrated value-added services like in-mold labeling (IML) or automated assembly.
Buyers should prepare with detailed CAD models, target cycle times, required shot-to-shot consistency, and a clear understanding of their material’s melt flow index and shear sensitivity. Thin wall molding companies expect clear specifications for gate locations, draft angles, cooling requirements, and tolerance stack-ups, as these are critical for successful mold design and process optimization.
A significant trend in thin wall molding is the increasing demand for sustainable materials, including bio-based polymers or recycled content. This introduces new processing complexities due to varying melt characteristics, potential for increased warpage, and different shrinkage profiles, necessitating even more advanced process optimization and material handling expertise from molders.
53 companies nationwide
Based in Melrose Park, IL, A1 Tool Corporation specializes in designing and manufacturing high-quality plastic injection molds. With extensive engineering experience since 1946, the company focuses on mold efficiency and durability, providing innovative solutions for clients. They are experts in manufactured quality, serving the plastic injection molding industry.
Based in Kulpsville, PA, Aline Components, Inc. specializes in custom thin wall thermoplastic injection molding and manufacturing. Since 1965, they provide comprehensive in-house services, including design, prototyping, and tooling, for diverse industries. The company operates with ISO 9001 and QS 9001 compliance.
Based in Scottsburg, IN, American Plastic Molding (APM) is an innovative engineering and manufacturing organization. They specialize in plastic injection molding and assembly, offering custom plastic parts and comprehensive program management for finished goods. APM provides full-service product development, engineering, and manufacturing solutions focused on customer service.
BD Custom Manufacturing in Bristol, IN, specializes in high-quality custom plastic extrusions. They offer custom tooling and color-matched profiles using diverse materials such as PVC, polyethylene, ABS, and HDPE. The company produces a wide range of custom plastic profiles, including multi-hollows and co-extrusions, for various industrial applications.
Based in Houston, TX, Blackwell Plastics, LP is a custom injection molder providing precision plastic parts since 1939. Specializing in thermoplastic and thermoset injection molding, their services include thin-wall molding, insert molding, over-molding, and gas-assist molding for diverse industries.
Country Plastics, Inc., based in Woodlake, CA, is an ISO 9001:2015 certified custom plastic injection molding company. They offer comprehensive services from mold design to part production. Specializing in high-quality plastic components, their capabilities include manufacturing thin-walled applications for diverse industrial needs.
Based in El Cajon, CA, DaMar Plastics is a plastic injection molding manufacturer serving Southern California. They offer comprehensive services including design, mold manufacturing, and both injection and blow molding, assisting clients in transforming their visions into reality with value-added solutions.
Based in Riverside, CA, Hi-Rel Plastics & Molding, Inc. specializes in custom plastic injection and blow molding. With over 40 years of experience, the company is ISO 9001, AS 9100, and ISO 13485 certified. They utilize an ISO 7 cleanroom for high-quality manufacturing, serving diverse major industries.
Intek Plastics, LLC., based in Hastings, MN, offers custom plastic extrusion and injection molding. Specializing in complex profiles, co-extrusions, and multi-material configurations, they provide thin wall molding for lightweight, durable parts. Capabilities include tight-tolerance components, overmolding, and engineering-grade resins for demanding applications.
Based in Sun Valley, CA, JB Custom Mold Mfg provides advanced mold design, mold fabrication, and strict-tolerance thermal plastic injection molding manufacturing services. Serving manufacturing businesses in the greater Los Angeles area since 1994, the company offers complete manufacturing solutions.
Kendrick Plastics, based in Grand Rapids, MI, is a full-service supplier of decorative interior trim components and assemblies for the automotive industry. They offer engineering and manufacturing services, delivering solutions for vehicle interiors such as instrument panels, door panels, and center consoles.
Majors Plastics, Inc. offers precision injection molding solutions for high and medium volume production of tightly-toleranced components. Services include two-shot and clean room injection molding, assembly, and secondary operations. They feature on-site engineering and tool room capabilities, operating under ISO 9001 standards.
Medway Plastics Corporation, established in 1974, provides custom injection molding and design services. With facilities in Long Beach, CA, and the Austin, TX area, the company manufactures a wide range of plastic products, from small to large parts, utilizing various commodity and engineering resins. They emphasize sustainable practices in their molding processes.
Based in Dallas, TX, Meridian Products Corporation provides comprehensive custom injection molding, tooling, and assembly services. Specializing in plastic injection molds, they work with diverse materials for industries like aerospace, automotive, medical, and electronics. Capabilities include rapid prototyping, post-molding decorating, and logistic support.
Based in Fort Worth, TX, Micro Mold Plastics USA, Inc. is an ISO 9001:2015 and AS9100D certified company. They provide plastic molding services and are DDTC Registered. The company emphasizes quality in its manufacturing processes, serving various industries with precision molding capabilities.
National Molding, with operations including in Miami, FL, is a global manufacturer of precision engineered plastic components. The company specializes in the injection molding segment, utilizing innovative technologies to produce high-quality precision parts for various industries and applications.
Based in Washougal, WA, PILLER AIMMCO provides thin wall injection molding services, producing complex parts with wall sections as thin as 0.010”. They offer over-molding, insert molding, and in-house mold design and tooling. The company serves industries including medical devices, automotive, and aerospace.
Based in Brea, CA, Plastek Manufacturing Inc. specializes in precision injection molded products. They provide comprehensive services, including prototypes, tooling, and production, for diverse industries like commercial and aerospace. The company processes engineering resins and Liquid Silicone Rubber for complex molding needs.
Plastic Molding Technology provides reliable, American-made plastic molding solutions. Specializing in high-quality injection molding and thermoforming services, the company helps simplify supply chains for businesses needing custom plastic components. They offer a direct manufacturing approach for various industrial applications.
Based in Hudson, MA, Plastic Molding Manufacturing is a U.S.-based custom plastic injection molding company. They provide full-service solutions, from DFM support and precision tooling to full-scale production. Capabilities include insert molding, two-shot molding, and medical/ISO 8 cleanroom services for high-quality, complex part manufacturing.
Based in Van Nuys, CA, Precision Molds & Molding Co. provides full-service custom plastic injection molding. With over three decades of experience, they offer expertise from conceptualization and design through final production, emphasizing precision and quality assurance. The company supports diverse client requirements for unique product needs.
Based in Ontario, CA, Poly Extrusions Inc. offers custom plastic extrusion, tubing, and profiles tailored to specific customer needs. With over 35 years of experience, they also provide injection molding services and specialize in plastic extrusion die development for various industrial applications.
Precision Molded Plastics Inc. is a vertically integrated plastic injection molding company based in Upland, CA. They specialize in custom mold and tooling fabrication, manufacturing a wide range of plastic parts and products. Their comprehensive capabilities ensure high-quality plastic components for various industrial applications.
Quality Plastics LLC is a family-owned custom injection molding company based in Fredericksburg, OH. They specialize in producing custom plastic parts with efficiency and precision, handling projects from prototypes to high-volume production. The company offers a wide range of material capabilities and provides in-house tooling and mold maintenance.
Reliant Worldwide Plastics, based in Gainesville, TX, specializes in custom plastic injection molding. They offer expertise in thin-wall molding, overmolding, and insert molding for complex, tight-tolerance parts. Services encompass product design, prototyping, tooling, and high-volume production, serving various industrial clients.
RMC Plastics, located in Houston, TX, provides custom injection molding services for precision plastic and rubber parts. Leveraging 50+ years of experience, they assist with design, tooling, and material selection for high-volume production. They serve industries like consumer, oil & gas, utilities, construction, medical, and machinery clients nationwide.
SeaGate Plastics, based in Toledo, OH, provides custom plastic solutions, specializing in injection molded components and plastic extrusion. Since 1987, they also offer CNC machining, fabrication, and assembly. Serving industrial, packaging, construction, and OEM customers, they operate manufacturing facilities across Ohio and Michigan.
Springboard Manufacturing specializes in plastic injection molding for medical devices, offering comprehensive capabilities including overmolding and insert molding. Based in Rancho Cordova, CA, they mass-produce precision components for stents, implants, and sutures. The ISO 13485:2016 certified company works with diverse thermoplastics.
Summit Plastic Molding, a full-service injection molding supplier based in Shelby Township, MI, offers comprehensive engineering, tooling, and manufacturing capabilities. They provide custom injection molding from 85 to 1000 tons, specializing in prototyping and production for automotive, medical, and defense sectors across their US facilities.
Based in Valley View, TX, T&R Tooling provides end-to-end plastic injection molding and custom tooling solutions. They offer DFM-optimized mold design, in-house and offshore mold building, prototyping, high-volume production, and post-molding services including assembly and packaging.
USA Injection Molding is a full-service plastic injection molding facility based in Cleveland, OH. The company designs, manufactures, and distributes custom plastic parts within the USA at competitive prices, offering comprehensive services from prototype to fulfillment.
Based in Valencia, CA, Valencia Plastics specializes in high-volume, custom plastic injection and blow molded parts. The company produces HDPE wide mouth containers and canisters, utilizing up to 100% post-consumer resin and food-grade materials. They hold ISO 9001-2015 and cGMP certifications.
Based in Tempe, AZ, Westfall Technik provides integrated plastics manufacturing, specializing in high-volume, high-speed, and tight-tolerance molding for thin wall containers. Their end-to-end services span design, in-house tooling, advanced molding, assembly, and automation, serving healthcare and consumer packaged goods industries effectively.
Based in Hopedale, MA, PlasTech Molding Solutions provides advanced custom injection molding, specializing in thin wall geometric applications and complex materials. With over 70 years of experience, they deliver precision molded parts for industrial, medical, and military sectors, operating with ISO 9001:2015, ITAR, and FDA certifications.
Based in Lake Forest, CA, RJC Mold specializes in plastic injection molding and mold manufacturing, offering services from prototypes to production. The company provides thin wall injection molding expertise for parts with continuous wall sections as thin as 0.010” (0.25mm). Capabilities include overmolding, insert molding, and two-shot molding, with dual-factory support.
Based in Houston, TX, Coastal Plastic Molding Inc. is a family-owned injection molding company established in 1984. They offer comprehensive services including design, engineering, tooling, molding, and assembly. Their facility features advanced, super-fast all-electric machines, ideal for precision and high-speed production requirements.
Based in Fallbrook, CA, Cord Industries is a full-service provider of plastic injection molding, insert, and over molding. With experience since 1975, they offer product design, prototyping, mold design, assembly, and packaging. They support customers from conception to consumer, delivering quality parts with competitive pricing.
Davies Molding is a US-based plastic molder specializing in custom injection, compression, and transfer molding for industrial OEMs. With over 90 years of experience, they produce high-performance thermoplastic and engineered thermoset components. They serve industries like defense, aerospace, medical, infrastructure, and transportation, offering both custom and standard parts.
D & L Tooling & Plastics Inc. provides comprehensive custom plastic injection molding services from its Jacksonville, TX facility. Specializing in complex, high-precision plastic parts, the company offers full-service solutions including tooling, design, engineering, assembly, and packaging for diverse industrial applications.
EVCO Plastics is a contract manufacturer specializing in thin wall molding and thin wall packaging services. The company provides comprehensive capabilities and expertise from its manufacturing facilities across the United States, including locations in Wisconsin and Georgia, collaborating with clients from project inception to completion.
Based in Hagerstown, MD, Fabricated Extrusion Company specializes in plastic injection molding, offering large shot capabilities to meet diverse specifications. As a turnkey manufacturing partner, they also provide custom profile and sheet extrusion, design engineering, custom tooling, and various finishing operations for components crafted from engineered resins.
Lavelle Industries, based in Burlington, WI, is a Made in USA OEM manufacturer of custom rubber and plastic molded components. They produce high-performance parts for industrial equipment, transportation, electronics, and healthcare, leveraging over 100 years of U.S.-based engineering and manufacturing expertise.
Lomont Molding LLC, headquartered in Mount Pleasant, IA, provides comprehensive plastic molding services. Since 1982, the company has specialized in high-pressure injection molding, blow molding, structural foam, over-molding, and nitrogen gas molding. They produce high-quality, precise plastic components for various industries, operating 24/7 to deliver innovative solutions.
Based in Conroe, TX, Lone Star Molding provides custom injection and compression molding services. They work with a wide array of polymers, including high-performance materials such as PTFE, HNBR, and Kevlar, for products with exceptional wear and temperature characteristics. The company also features an in-house machine shop for mold making.
Based in Sterling Heights, MI, Mayco International is a global Tier 1 automotive supplier specializing in thin wall injection molding. They provide comprehensive services from pre-conceptualization and design engineering to validation and full-scale manufacturing. Their offerings include interior modules, assembly, sequencing, and logistics for demanding client needs.
Ohio Precision Molding, Inc., based in Barberton, OH, specializes in comprehensive injection molding capabilities. The company offers design and engineering services, material selection, short-run manufacturing, and secondary services like assembly and molded parts decorating. They serve various industries by providing custom plastic solutions.
Petersen Molding Corporation, located in Norwalk, CA, is a custom plastic injection molding company. They specialize in high-volume production of precision plastic parts requiring tight tolerances for diverse industries. Services include design, engineering, mold making, and secondary operations, providing comprehensive manufacturing solutions.
Based in Alpharetta, GA, Pexco specializes in custom plastic injection molding and extrusion. They produce high-performance polymer components for various industrial and commercial applications. The company provides comprehensive solutions for plastic part development and manufacturing from its facilities across North America.
Based in Redlands, CA, Plastics Plus Technology Inc. is a woman-owned, ISO 9001:2015 and ISO 13485:2016 certified custom plastic injection molding company. They provide close-tolerance components and value-added services for medical, automotive, dental, and electronic component industries, adhering to FDA and GMP standards.
Based in Eagle, WI, Plastic Molded Concepts, Inc. is a plastic injection molding company specializing in molding engineered resins. The firm utilizes advanced processes to produce precision plastic parts, including components that demand intricate designs and challenging material properties for various high-performance applications.
Thunderbird Molding is a custom plastic injection molding and contract manufacturing company with multiple US facilities. They provide comprehensive services including mold design, prototyping, engineering, production, and assembly. Specializing in high-precision molding capabilities, they assist clients in realizing cost improvements and reaching performance potential.
Based in Bedford, OH, Toth Mold & Die Inc. specializes in custom injection molding and injection mold building. The company offers comprehensive services from product design to final part production, including building, sampling, and debugging molds for other molding companies.
Based in Livermore, CA, Westec Plastics Corporation is an ISO 13485 certified plastic injection molding organization established in 1969. They provide mold building, 3D printed tooling, and secondary operations for diverse sectors including medical, aerospace, defense, consumer products, and electronics.
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To prevent warpage, focus on designing for consistent wall thickness, strategically placing gates to ensure balanced material flow, implementing robust cooling channel designs for uniform heat extraction, and minimizing internal stresses through optimized pack and hold times. Material selection with lower anisotropic shrinkage rates is also crucial.
Material selection is paramount. Polymers with high melt flow rates (MFR), good melt stability, and rapid solidification properties are crucial for filling thin sections quickly and completely. However, higher MFR can also increase shear sensitivity and the potential for flash, requiring a careful balance. Common materials include specialized grades of PP, HDPE, PC, and ABS.
Inquire about their experience with high-cavitation, hot runner molds, their typical tooling lead times, in-house maintenance capabilities, and their approach to mold flow analysis and DFM specifically for thin-wall geometries. Also, ask about their guaranteed tool life and preventative maintenance programs, which are critical for long-term consistency.
Thin wall molding can significantly reduce cycle times, often by 30-50% or more, compared to conventional molding. This reduction is primarily attributed to the faster cooling of thinner sections and the use of optimized rapid injection speeds, which are key drivers for its adoption in high-volume, cost-sensitive applications.
They achieve this through meticulous mold design with precise cavity dimensions, advanced injection molding machines capable of extremely high speed and pressure control, real-time process monitoring (e.g., in-mold pressure sensors), and robust statistical process control (SPC) systems to detect and correct deviations rapidly and maintain shot-to-shot consistency.
Common defects include short shots (insufficient filling due to premature cooling), warpage (uneven cooling or internal stress), flash (melt seeping into mold gaps), and material degradation (excessive shear or temperature during injection). These are addressed through comprehensive DFM, mold flow analysis, precise optimization of injection parameters (speed, pressure, temperature), careful material selection, and rigorous process control strategies.