Sajar Plastics Inc is an American plastics manufacturing business based in Middlefield, Ohio, recognized for producing large, complex injection-molded components. Founded in 1949, the company developed expertise in gas-assist injection molding, structural foam molding, and conventional plastic injection molding. It became part of Universal Plastics Group following an acquisition in 2017.
Unlike businesses that manufacture everyday disposable plastic products, Sajar focuses on custom-engineered components for industrial and commercial equipment. Its manufacturing background includes products requiring structural strength, precise dimensions, and attractive surface finishes.
Understanding the company’s history, technologies, and current ownership helps explain its place in the American plastics industry. This article explores its development, manufacturing services, target markets, quality practices, and the factors businesses should consider when choosing a molding supplier.
What Is Sajar Plastics Inc?
Sajar Plastics is a custom plastic injection molding manufacturer specializing in large, technically demanding components. Its work primarily serves original equipment manufacturers (OEMs), which incorporate specially manufactured parts into their finished products.
The company is associated with the production of equipment housings, covers, panels, handles, doors, and other engineered plastic components. These products often need to perform specific mechanical functions while maintaining a consistent external appearance.
The Universal Plastics Group identifies Sajar as a manufacturer with gas-assist, structural foam, and standard injection molding capabilities. It also describes the Middlefield operation as having a manufacturing facility of approximately 150,000 square feet.
Sajar Plastics Company Overview
| Company detail | Information |
|---|---|
| Company name | Sajar Plastics |
| Founded | 1949 |
| Location | Middlefield, Ohio, United States |
| Industry | Plastics manufacturing |
| Specialization | Custom injection molding |
| Core technologies | Gas-assist, structural foam, conventional injection molding |
| Parent company | Universal Plastics Group |
| Acquisition year | 2017 |
| Key markets | Medical, laboratory, industrial and retail equipment |
| Quality standard | ISO 9001 registration reported by parent group |
Historical business listings refer to the operation under names such as Sajar Plastics Inc and Sajar Plastics LLC. These historical listings do not independently establish its current legal entity name. Current parent-company materials continue to identify the Middlefield operation as Sajar Plastics.
The History of Sajar Plastics Inc
Early Beginnings in 1949
Sajar Plastics began operations in Middlefield, Ohio, in 1949. According to the company’s historical account, manufacturing originally started with three injection molding machines producing conventionally molded plastic components.
As demand for engineered plastics expanded, the business gradually developed its manufacturing capacity, technical knowledge, and equipment. This growth helped establish Sajar as a specialist in larger components with more demanding design requirements.
The company name was derived from an acronym based on the surnames of its founders. Its industrial history reflects the wider development of plastic injection molding from a relatively straightforward production method into a sophisticated manufacturing process.
Development of Gas-Assist Molding
A significant stage in the company’s history occurred during the early 1980s, when Sajar became involved in the development of gas-assisted injection molding technology.
Universal Plastics describes Sajar as one of the original companies involved in developing the process. Gas-assisted molding offered manufacturers additional ways to produce large, complex parts without some of the limitations associated with conventional molding.
Historical company information states that Sajar commercialized more than 500 gas-assisted components for OEM customers. This figure represents a reported historical achievement rather than a verified count of products currently in production.
Who Owns Sajar Plastics Today?
Sajar Plastics was acquired by Universal Plastics in 2017. The acquiring company was based in Holyoke, Massachusetts, and specialized in heavy-gauge thermoforming.
The transaction expanded Universal Plastics’ manufacturing capabilities by adding Sajar’s experience in large-part injection molding.
The acquisition was intended to create more manufacturing options for customers at different stages of product development. Businesses could potentially begin production using thermoforming and move to injection molding when product requirements or manufacturing economics justified the change.
Universal Plastics announced the acquisition in July 2017, without publicly disclosing the purchase price. Its corporate history continues to identify Sajar as part of the wider manufacturing group.
Sajar’s Role Within Universal Plastics Group
Universal Plastics Group brings together companies with different plastics manufacturing capabilities, including injection molding, thermoforming, and blow molding.
Sajar contributes specialized injection molding expertise, particularly for large components that require controlled dimensions and high-quality finishes.
This relationship gives customers access to a broader selection of manufacturing processes. However, services offered by other group facilities should not automatically be assumed to be available at the Middlefield plant.
Manufacturing Services Offered by Sajar Plastics
Sajar Plastics’ manufacturing expertise centers on three injection molding methods. Each process provides different advantages depending on component size, design complexity, production requirements, and desired surface finish.
Gas-Assist Injection Molding
Gas-assist injection molding is one of Sajar’s best-known capabilities. The process introduces pressurized gas into a mold during manufacturing to help shape the plastic and control how the material fills the cavity.
In internal gas-assisted molding, the gas can create hollow channels within thicker areas of a component. This may reduce material consumption, lower part weight, and minimize surface defects such as sink marks.
External gas assistance works differently. Gas pressure acts against the back of a molded part, helping the visible surface reproduce the mold’s finish more accurately.
These techniques can be useful for large equipment panels, handles, enclosures, and components where appearance and dimensional stability are important.
Structural Foam Injection Molding
Structural foam molding is another established capability associated with Sajar Plastics Inc.
This method introduces a blowing agent into molten plastic, producing a cellular structure inside the molded component. It is particularly useful for manufacturing relatively thick, large structural parts.
The process can reduce molding pressure and help manufacturers produce components that would be difficult to manufacture using certain conventional methods.
However, structural foam products may have a textured or swirled surface. Components requiring a smooth appearance can need additional finishing or specialized processing techniques.
Conventional Injection Molding
Alongside its more specialized processes, Sajar offers conventional injection molding.
This technique involves injecting molten plastic into a shaped mold, allowing it to cool, and removing the finished component.
Conventional molding is valuable when a part requires repeatable dimensions, detailed features, and consistent production quality.
Selecting the right process depends on the component’s design and commercial requirements. Gas-assisted or structural foam molding is not automatically better than standard injection molding for every application.
What Industries Does Sajar Plastics Serve?
Sajar’s manufacturing experience covers several commercial and industrial markets. Its parent company identifies medical, laboratory, diagnostic, manufacturing, and retail equipment among the operation’s principal areas of activity.
Medical and Laboratory Equipment
Medical and diagnostic equipment frequently requires large plastic housings, protective covers, and precisely manufactured panels.
These components may need to accommodate electronic systems, provide maintenance access, and maintain a professional appearance.
For such applications, dimensional consistency, material selection, and appropriate manufacturing controls are particularly important.
Industrial and Retail Equipment
Industrial machinery often requires covers, access panels, and protective enclosures that combine functional strength with manageable weight.
Retail equipment, including self-service kiosks and dispensing machines, may also use molded components with complex shapes and visible surfaces.
Sajar’s experience in large-part molding makes these industries relevant to its manufacturing specialization.
Quality Control and Finishing Services
Manufacturing a plastic component involves more than producing the initial molded shape. Customers may also require painting, printing, assembly, inspection, and protective packaging.
Universal Plastics identifies in-house painting, secondary operations, and assembly among the capabilities of its Middlefield facility. Its injection molding services also describe dimensional inspection and surface-quality measurement methods.
These additional operations can simplify production by reducing the number of separate suppliers involved in a project.
The parent group also identifies Sajar as ISO 9001 registered. ISO 9001 concerns quality management systems, although customers requiring formal certification should request a current certificate covering the relevant facility and activities.
How Sajar Plastics Compares With Other Manufacturing Methods
The most suitable manufacturing method depends on the product rather than the reputation of a particular process.
For example, thermoforming can offer lower initial tooling costs for large, relatively thin components produced in smaller quantities. Injection molding generally requires greater tooling investment but can provide advantages for integrated features and repeatable production.
Gas-assisted molding may help reduce weight or surface imperfections in suitable designs, while structural foam molding can be useful for large, thick-walled components.
A manufacturer should evaluate total costs, including tooling, materials, finishing, assembly, inspection, and anticipated production volumes—not simply the price of an individual molded part.
How to Evaluate Sajar Plastics as a Supplier
Businesses considering Sajar for a custom manufacturing project should prepare clear technical requirements before requesting a quotation.
Important details include:
- Component dimensions and available engineering drawings.
- Preferred plastic material and performance requirements.
- Expected annual production quantity.
- Surface finish, color, and cosmetic standards.
- Tooling budget and target production schedule.
- Inspection, testing, and documentation requirements.
Customers should also confirm whether the specific project can be completed at the Middlefield facility or requires assistance from another Universal Plastics Group operation.
An early engineering review can identify manufacturing problems before expensive tooling decisions are made.
Sajar Plastics Inc in 2026
As of October 2026, Universal Plastics Group continues to identify Sajar Plastics as its Middlefield-based injection molding business.
Its established capabilities remain relevant to manufacturers requiring large, complex plastic components, particularly those involving gas-assisted molding and appearance-sensitive designs.
Some online business directories contain employee counts, revenue estimates, or older operating details. Such figures should not be treated as verified current information without supporting company records.
For the latest production capacity, certification documents, quotations, and available services, direct confirmation from the manufacturer remains the most reliable approach.
Conclusion
Sajar Plastics Inc has a manufacturing history extending from 1949 to its present position within Universal Plastics Group. Its development in gas-assisted molding and its combination of structural foam and conventional injection molding distinguish it within the custom plastics industry.
The company’s primary value lies in manufacturing large, complex components for equipment manufacturers that require technical precision, attractive finishes, and dependable production processes.
For businesses evaluating plastics suppliers, understanding Sajar’s manufacturing strengths, ownership, and available services provides a useful starting point for selecting the right production partner.
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Frequently Asked Questions
What is Sajar Plastics Inc known for?
Sajar Plastics is known for manufacturing large, complex plastic components using gas-assist injection molding, structural foam molding, and conventional injection molding.
Where is Sajar Plastics Inc located?
The company’s manufacturing operation is located at 15285 South State Avenue, Middlefield, Ohio 44062, United States.
Who owns Sajar Plastics Inc?
Sajar Plastics was acquired by Universal Plastics in 2017 and is part of Universal Plastics Group.
Is Sajar Plastics still operating in 2026?
Universal Plastics Group continues to list Sajar as its Middlefield manufacturing operation. Customers should contact the company directly for current production availability.
What products does Sajar Plastics manufacture?
Its manufacturing capabilities support custom plastic housings, equipment covers, panels, doors, handles, bezels, and other engineered components used in industrial and commercial equipment.
Does Sajar Plastics offer custom manufacturing services?
Yes. The Middlefield operation specializes in custom injection molding and offers related capabilities, including engineering support, painting, assembly, and secondary finishing.
