Sinclair & Rush originally invested in the thermoforming process to expand its capabilities in manufacturing clamshells, blisters and packaging trays for the VisiPak business unit. The business grew organically for years prompting S&R to begin making strategic acquisitions within the industry which led to innovative mold-base technology and an extensive line of stock clamshells.

What is Thermoforming?

Thermoforming is a process of heating thermoplastic sheet and placing it over a mold until cooled. Its primary forms include the thin gauge thermoforming process used extensively in producing disposable packaging for retail applications and thicker gauge forming commonly used to mold everything from shipping trays to permanent components in refrigerators, automobiles, etc.

Business Units Supported

The Sinclair & Rush thermoforming operation primarily serves the VisiPak business unit by producing a wide variety of clear plastic packaging including its signature line of stock clamshells.

The StockCap business unit utilizes thermoforming to support its client’s need for protective shipping and work-in-process trays used in a wide variety of industries to store, protect and efficiently transport high-value components.


Our thermoforming facility is located in an ultra-clean, 62,500 square foot facility allowing us to effectively serve our clients and support our thermoforming business.

Arnold, Missouri - USA


Our thermoforming operations are supported worldwide by our experienced VisiPak sales and engineering teams. These specialists aid customers with sizing, design and more, to find the best solutions for their specific application. Armed with the latest CAD and 3D printing technology, custom packages and trays can move from concept and design to prototyping and production in the most efficient and cost-effective manner. All locations benefit from the company’s extensive experience in materials and design innovation, automation and quality control while conforming to the unique needs of their specific markets.


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