Best Foam for Tool Box Inserts: 6 Types and Their Uses

Tool boxes need to do more than provide somewhere to store equipment. When tools are carried between workshops, sites, vehicles, and other locations, they can move around inside the box and become damaged through repeated handling.

A custom foam insert gives each tool a defined position, helping prevent movement while making the contents easier to organise and check. The type of foam used also matters, as different materials offer different levels of cushioning, support, durability, and resistance to everyday use.

The best foam for tool box inserts will depend on the tools being stored and how the box is used. Lightweight hand tools may have different requirements from heavy engineering equipment, while tools that are regularly transported may need different protection from those kept in a workshop.

Before looking at the individual foam types, it is worth considering the factors that can affect how well an insert performs.

Factors to Consider When Selecting Foam

The right foam depends on what the insert needs to do. A layout for lightweight hand tools has different requirements from one designed to hold heavy engineering equipment or specialist tools used in demanding environments.

Several factors should be considered when selecting the material:

• Density: Denser foam can provide greater support for heavier tools, while softer materials can offer more cushioning for delicate items.
• Durability: Tool boxes may be opened and closed frequently, so the insert needs to withstand repeated handling without quickly losing its shape.
• Cushioning: The foam should help absorb impacts and prevent tools from contacting each other or the walls of the box.
• Chemical resistance: Workshop and field environments can expose inserts to oils, fuels, cleaning products, and other substances.
• Tool layout: The material needs to work with the shape and depth of the required cavities, particularly where tools have irregular profiles.
• Operating environment: A tool box used indoors has different requirements from one regularly transported to outdoor or industrial sites.

With these factors in mind, the following six foam types can each have a place in tool box inserts, depending on the application.

1. EVA Foam

Best suited to: Organised hand-tool storage, workshop tool sets, and layouts where individual tools need clearly defined positions.

EVA foam is a popular choice where the insert needs to provide cushioning while maintaining a clean, organised layout. Its combination of resilience and relatively firm structure makes it suitable for holding individual tools in shaped recesses.

A practical choice for hand tools

EVA foam can work particularly well for hand tools such as spanners, screwdrivers, pliers, cutters, and measuring equipment. Each item can have its own position, making it easier to see what is in the tool box and identify when something has been removed.

It can also suit tool sets where keeping everything in a consistent arrangement is important. For example, an engineer may have a dedicated recess for each size of spanner or screwdriver, while a maintenance kit could have separate spaces for pliers, cutters, measuring tools, and other frequently used items.

EVA can also be produced in different colours, which can be useful when creating visual tool layouts. A contrasting base layer can make empty spaces more obvious, providing a simple way to check that all tools have been returned after use.

2. Polyethylene Foam

Best suited to: Heavier hand tools, engineering equipment, workshop tools, and equipment that needs firm support during transport.

Polyethylene foam can be a good option where the insert needs to provide firm support as well as cushioning. Its structure makes it suitable for tool boxes containing heavier or more robust equipment that needs to remain securely positioned.

Support for robust workshop equipment

This can include engineering tools, workshop equipment, components, and specialist tools that are frequently moved between locations. A suitably selected grade can support the weight of the equipment without the insert simply acting as a soft layer underneath it.

For example, a service engineer carrying a selection of heavier tools between sites may need individual cavities that prevent equipment from shifting as the box is moved. The insert can be shaped around the tools so that they remain supported rather than being left to move against one another.

The right density is important when working with heavier tools. A foam that is too soft may compress under load, while a suitably selected material can provide a more stable fit around the equipment.

3. Cross-Linked Foam

Best suited to: Frequently handled tool boxes, field-service kits, and applications where the insert needs to withstand repeated use.

Cross-linked foam has a closed-cell structure that can provide a useful combination of cushioning, support, and durability. It can provide a firm, clean surface around tools while standing up to regular handling.

Durability for tools that are used regularly

This makes it worth considering for tool boxes that are opened frequently or transported between workshops and work sites. A field technician, for example, may remove and replace the same tools throughout the day, placing greater demands on the edges and surfaces of the insert.

The insert needs to cope with tools being removed and replaced repeatedly without the individual recesses quickly losing their shape. A suitable foam can help maintain the defined layout while providing protection around the equipment.

It can also be suitable where the tool box forms part of a wider protective packaging system. A precisely cut insert can hold equipment securely while the surrounding case or box provides the external protection.

4. Polyurethane Foam

Best suited to: Lightweight tools, accessories, components, and applications where softer cushioning is more important than load-bearing support.

Polyurethane foam is generally softer and more flexible than many of the denser foams used for heavy-duty tool storage. This makes it more appropriate for applications where cushioning is a greater priority than supporting substantial loads.

Softer cushioning for lighter contents

It can be useful for lighter tools, accessories, or components that need some protection against knocks and contact inside a storage box. This could include smaller hand tools, fittings, accessories, or other items stored alongside a main tool collection.

It can also be used alongside other materials where different levels of support are required within the same layout. This can be useful when a tool box contains a mixture of equipment with different protection requirements.

For heavier tools, however, a more supportive foam may be preferable. The material needs to be selected according to the weight and shape of the equipment rather than simply choosing the softest option available.

5. Layered Foam

Best suited to: Tool boxes containing mixed equipment, different tool sizes, or layouts that require cavities at different depths.

Some tool boxes contain a mixture of equipment with different sizes, weights, and shapes. A layered foam construction can provide a way to accommodate these differences while making better use of the available space.

Different depths for mixed tool collections

Different layers can be cut to create deeper cavities, shaped profiles, and dedicated spaces for individual tools. This can be particularly useful when the insert needs to hold both larger tools and smaller accessories in one organised layout.

For example, a tool box might contain larger power tools alongside sockets, screwdrivers, drill bits, and measuring equipment. A layered insert can accommodate these different items without requiring every cavity to have the same depth.

Layering can also make it easier to create a practical balance between protection and accessibility. Tools can be supported at the appropriate depth while still leaving enough of the handle or body exposed to remove them from the insert.

6. High-Density Foam

Best suited to: Heavy-duty tools, specialist engineering equipment, and tool boxes where individual items place significant loads on the insert.

Heavy-duty tool boxes may need a more supportive insert than one designed for ordinary hand tools. High-density foam can provide greater resistance to compression, making it suitable for applications where the insert needs to support heavier equipment.

Greater support for demanding loads

This can include specialist engineering tools, industrial equipment, and other items that place considerable weight on individual sections of the insert. The material can be shaped around the equipment so that the load is distributed across the surrounding foam rather than relying on a single small contact point.

This can be useful for equipment such as heavy-duty measuring instruments, specialist maintenance tools, or other substantial items that need to remain securely positioned inside a box. The insert can be designed to support each item while keeping the overall layout organised.

As with other foam types, density should be selected according to the actual application. The heaviest or densest material is not automatically the best choice, particularly where the insert also needs to provide cushioning or accommodate delicate components.

Comparing Foam Types for Tool Box Inserts

Each foam type has characteristics that can make it more suitable for one tool box application than another. The following comparison provides a starting point, although the final choice should take the equipment and its intended use into account.

Foam type	Suitable for	Key advantage	Main consideration
EVA foam	Hand tools and organised layouts	Good balance of cushioning and support	Choose the appropriate density for the tools
Polyethylene foam	Heavier tools and workshop equipment	Firm support with cushioning	Density needs to match the load
Cross-linked foam	Frequently handled tool boxes	Durable closed-cell structure	Application and required firmness should be considered
Polyurethane foam	Lightweight tools and accessories	Softer cushioning	Less suited to heavier loads
Layered foam	Mixed tools and complex layouts	Allows different depths and profiles	Requires careful planning of the insert design
High-density foam	Heavy-duty tools and equipment	Greater resistance to compression	May provide more support than needed for lighter tools

Designing the Insert Around Your Tools

The foam is only one part of the finished insert. The layout also needs to work with the tools themselves, leaving them secure without making them difficult to remove or replace.

Build the layout around the tools

A custom insert can give each tool its own shaped cavity rather than relying on a general-purpose compartment. The position, depth, and profile of each recess can be planned around the dimensions of the equipment.

This can make better use of the available space, particularly where a tool box contains items of very different shapes and sizes. Smaller tools can be grouped together while larger equipment has deeper or more substantial cavities.

Keep frequently used tools accessible

The most frequently used tools should not be buried in deep or awkward recesses. A well-planned layout can leave enough of each tool exposed to make removal straightforward while still keeping it securely positioned.

This is particularly useful for service engineers and other users who may open the same tool box repeatedly throughout the day. The insert can support a consistent arrangement without slowing down access to the equipment.

Leave room for future additions

Tool collections can change over time as equipment is replaced, upgraded, or added. A little forward planning can make it easier to adapt the layout rather than having to replace the entire insert whenever the contents change.

Depending on the application, this could mean leaving space for additional tools or designing the insert in sections. The best approach will depend on how stable the tool collection is and how the box is expected to be used.

Custom Tool Box Inserts from Trojan Crates

A foam insert works best when it is designed around the tools it needs to hold. Rather than using a standard layout, CNC routing allows individual recesses, compartments, and profiles to be created around the dimensions and shape of the equipment. Trojan Crates designs its foam inserts in 3D and CNC routes them in-house, with custom-fit cavities for tools, equipment and components.

Trojan Crates designs and manufactures CNC foam inserts using CAD software and computer-controlled routing equipment to create accurate, repeatable layouts. Inserts can be developed from technical drawings, measurements or 3D files, or Trojan can work from the physical item itself.

Custom feature	Application
Individual tool recesses	Keeps each item in a defined position
Different cavity depths	Accommodates tools of varying sizes and profiles
Custom tool layouts	Makes frequently used equipment easier to access
Foam densities and grades	Can be matched to the application
Colour options	Can improve visibility and make missing tools easier to identify
CNC-cut profiles	Creates accurate shapes around individual tools

Trojan also states that its foam density and grade are selected according to the weight, fragility and operating environment of the equipment. Its CNC designs can also be reproduced for repeat orders, making the same insert layout available for future requirements.

The Right Foam for the Right Tools

The six foam types covered here each have different strengths. EVA can suit organised hand-tool storage, polyethylene and high-density foams can provide greater support for heavier equipment, while polyurethane can offer softer cushioning for lighter contents. Cross-linked and layered foams can be useful where durability, mixed equipment, or different cavity depths are important.

The best result comes from matching the material to the tools and then designing the insert around them. A custom foam insert can combine the appropriate material, cavity dimensions, positioning, and access requirements in one layout.

Trojan Crates can design and CNC cut custom foam inserts for tool boxes, cases, and other storage systems, with the material and layout selected around the equipment being protected.

Need a tool box insert? Contact Trojan Crates to get the right foam and a custom layout for your tools and equipment.