Selecting the right interior for your custom case is critical to protecting your equipment during transport and storage. Whether you're safeguarding delicate electronics, heavy industrial tools, or precision instruments, the interior you choose directly impacts how well your gear withstands the rigors of daily use. Understanding the two main types of custom case interiors (foam and molded) will help you make an informed decision that balances protection, organization, and practicality.
Understanding Foam Inserts: Versatile Cushioning
Foam inserts excel at absorbing shock and conforming to irregularly shaped items. The material's compressible nature creates a protective cocoon around your equipment, preventing movement and impact damage.

Foam insert varieties include:
- Custom-cut foam: Precisely shaped to match your equipment's exact dimensions
- Pick-and-pluck foam: Pre-scored cubes that you can remove to create custom compartments
- Layered foam: Multiple density layers that you can cut yourself and provides graduated protection
Foam works particularly well for optical equipment, medical devices, and electronic components where vibration dampening is essential. The material comes in various densities, from soft open-cell foam for lightweight items to firm closed-cell foam for heavier gear.
The main limitation of foam is its susceptibility to compression over time. With repeated use, foam may lose some of its protective properties and require replacement, especially in high-impact environments.
Exploring Molded Interiors: Rigid Structural Support
Unlike injection-molded cases, which are rigid, blow-molded cases are softer, rounder, and easier to form. The Plastic Forming Company combines our standard mold tooling with components designed for your specific needs. This enables us to create a unique blow-molded case for much less than the cost of building a custom mold.
How much less? On average, this approach can reduce tooling costs by 80% to 90%, and you still enjoy all the benefits of our double-wall construction.
Key characteristics and benefits of molded interiors:
- Permanent structural integrity that won't degrade
- Precise compartmentalization for quick equipment identification
- Smooth surfaces that facilitate easy cleaning
- Unrivaled product protection
- Enticing display options
- Enhanced space efficiency
- Superior durability
These interiors are ideal for tools, laboratory equipment, and any gear that benefits from rigid support. The manufacturing process allows for complex geometries, including tiered levels, angled holds, and integrated cable management.
Factors to Consider When Choosing Your Custom Case Insert
Protection requirements: Evaluate impact sensitivity, weight, and how your equipment is typically handled. Fragile items often need foam's shock absorption, while robust tools benefit from molded support.
Access frequency: If you need quick, repeated access to specific items, molded compartments with clear organization win over foam that may shift slightly. For items accessed less often, foam's simplicity may suffice.
Equipment variability: Consider whether your gear configuration changes. Foam offers more adaptability for evolving needs, while molded inserts work best for standardized equipment sets.
Environmental conditions: Foam can absorb moisture in humid conditions, while molded plastic remains unaffected. Temperature extremes may also influence material selection.
Professional Case Solutions from The Plastic Forming Company
At The Plastic Forming Company (PFC), we bring over 40 years of experience designing American-made cases with custom interiors tailored to your exact specifications. Our in-house manufacturing ensures every component, from the case body to latches and hardware, meets rigorous quality standards.
We offer both types with customization options:
- Custom foam interiors: CNC-cut to your equipment's precise dimensions
- Double-wall blow-molded interiors: Durable plastic construction with eco-friendly domestic materials
Having created cases for over 5,000 different products across industries, we understand the nuances of equipment protection. Whether you need branding elements like custom colors and logos or specialized features like shock-mounted compartments, our team can design a solution that protects your investment and presents your equipment professionally.
Ready to protect your equipment with a custom case that's built to last? Contact PFC to discuss your specific requirements and discover how the right case can simplify your equipment transport and storage.

