Honeycomb Dunnage FAQ: Replacing Foam Without Losing Protection

Foam replacement projects fail when the function is not named. These questions cover how to map what each foam piece does, which paper structure can do it, and what test proves the replacement before a shipment depends on it.

What functions does foam perform in a crate?

Four, usually mixed: holding a component in position, absorbing drop energy, filling an irregular void and spreading a point load. Foam cushions by deforming and recovering; paper honeycomb resists compression and is stiff. If the function was positioning, paper does it better and lighter. If the function was cushioning, paper needs a designed crush zone and a drop test. The mapping is the whole project, because a replacement that matches the dimension and not the function is a replacement that transfers the drop energy into the product.

How do you map the functions?

Take each foam piece and ask what happens to the product if the piece is removed: it moves, it is struck, it rattles, or a surface is marked. The answer names the function. Do it with the product in the crate and with the shipping route in mind, and write the functions down before choosing materials. A team that maps the functions usually finds that most pieces are positioners and only one or two are cushions, which changes the cost of the project.

Can paper replace foam for cushioning?

Sometimes. Paper cushions by crushing, so a folded corrugated structure with cells that collapse progressively absorbs energy, and it works when the drop height and the mass are known. A honeycomb block does not crush progressively; it resists until it buckles, and the buckle is a sudden loss of support. That is why a honeycomb pad can be an excellent positioner and a poor cushion. If the product is heavy, the paper solution needs a larger area and a designed crush zone, and only a drop test with an accelerometer can confirm it.

What does the drop test need to measure?

Acceleration at the component, not only whether the crate survived. A crate can pass a drop test and still transmit an acceleration that damages a bearing or a circuit board. Place an accelerometer on the component or on a representative mass, run the drop from the height the route implies, and compare with the limit the product designer gives. A pass on the crate and a fail on the component is a common result in foam replacement, and only the second number matters for the product.

Does moisture change the answer?

Yes, and more than in a foam pack. Paper takes up moisture and loses stiffness, so a pack designed at the edge of its capacity will fail on a humid route. Coat the faces, seal the cut edges, add a desiccant or a barrier liner for a wet route, and put a humidity indicator in the crate so the receiver can see whether the pack held. A paper replacement should carry a margin rather than run at the limit of the test.

What about abrasion?

A component held by paper is held by friction and shape, and vibration can polish a painted surface at the contact. Add a soft liner at the contact if the finish matters, and run a vibration test with the real pallet and stack. A pack that holds the component but marks it fails at the customer's incoming inspection, and the mark is often noticed before the position is checked.

Can the pack be reused?

A paper dunnage system is usually single trip. If the crate returns, the paper parts must be replaceable and available, and the crate should allow them to be swapped without tools. A returnable pack that cannot be re-dressed will be replaced with foam after the first cycle, and the environmental argument disappears with it.

How should the replacement be specified?

For each piece: the function, the material and grade, the dimensions with tolerances, the contact liner, the moisture protection and the test that proves the function. Add the drop and vibration results and a retained sample. A specification that describes the shape and not the function has described a block, and a block is not a cushion.

How is the dunnage fixed in the crate?

By friction fit, by glue, or by a frame that traps it. A friction fit is easy to assemble and can move under vibration; a glued pad is stable and cannot be replaced; a frame is the most reliable and adds parts. Specify the fixing method and test it with a vibration run, because a pad that shifts by a few millimetres changes the clearance that protects the component.

What about the weight of the pack?

Paper dunnage usually reduces weight compared with foam for the same function, and the saving matters for air freight and for manual handling. Weigh the packed crate before and after the change, and include the weight in the specification. A reduction that is spent on a heavier crate frame is not a saving, so compare the complete pack rather than the dunnage alone.

How should a supplier be asked to quote?

By function and by test, not by shape. Give the component weight, the drop height, the route and the contact points, and ask for a design that passes the test with a stated margin. A quote that is based on a drawing of a block will reproduce the foam shape in paper, which is the failure mode this project is trying to avoid.

When should the project not proceed?

When the product is heavy, the route is wet and the crate is reused many times, the paper solution may need so much structure that it loses the cost and weight advantage. In that case the honest answer is a hybrid: paper where it works and a different material where it does not. A partial replacement that is tested is better than a complete replacement that fails.

How should the pack be documented for the customer?

With a drawing that shows each dunnage piece, its function and its part number, and a short assembly sequence with photographs. A customer who receives a crate with paper dunnage needs to know how to repack it for a return or a service swap, and a drawing that shows only the shape leaves them guessing. The documentation is part of the product, especially for a pack that is opened and closed more than once.

What is the most common mistake in a foam replacement?

Matching the foam dimension instead of the foam function. A pad that is the same thickness and the same footprint looks like a drop-in replacement, and it transfers the load differently. The second most common is testing the crate and not the product. Both mistakes are avoided by mapping functions and measuring acceleration at the component before the design is fixed.