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Egg-Crate Foam
Convoluted (Egg-Crate) Foam Inserts
Peaked foam that spreads contact pressure across the whole surface of your product, so nothing takes a hard point load.
The convoluted peaks flex independently and conform to whatever sits against them, cushioning gently while holding the item down. It is the classic case lid and base combination: a routed foam base locates the product and an egg-crate lid presses it in place. Lightweight, economical, and cut to your case dimensions to ±0.5 mm.
Specifications
Light, even cushioning by the case
| Material | Convoluted open-cell PU or resilient PE foam. Densities from 1.2 to 9.0 lb/ft³, chosen for cushion softness and recovery. |
|---|---|
| Typical format | Case lids and bases up to 24 × 24 in; convolution height 0.75 to 2.5 in over a 0.25 to 1 in web. |
| Product fit | Lightweight and flat goods, delicate finishes, and case tops that press down on a routed base below. |
| Color / finish options | Charcoal, black, gray, and white; uniform peaked surface. |
| Fabrication method | Convoluting rollers plus die-cutting to case outline, ±0.5 mm cut tolerance. |
| Decoration | Foam color selection; typically undecorated as a lid or base layer. |
| Minimum order | MOQ 25 units. |
| Lead time | 7–10 business days after proof approval. Design proof in 24–48 hours. |
| Packaging / kitting | Pairs with routed foam bases; ships flat, stacked for efficient freight. |
Overview
The lid that presses everything down, gently
Convoluted foam, better known as egg-crate, is the workhorse of even-pressure cushioning. Its surface is a repeating field of soft peaks and valleys, formed by pressing a foam sheet between meshing rollers that split one bun into two mirror-image convoluted pieces. Those peaks are the whole point. Each one flexes on its own, so when a product presses against the sheet the load spreads across dozens of contact points instead of concentrating on a few. That distributed pressure is what protects flat panels, glossy surfaces, and lightweight assemblies that would otherwise pick up a dent or a witness mark from a flat pad.
Why it beats the commodity version
A plain flat pad cushions, but it also transmits a single, broad pressure across the product face, and any high spot in the box becomes a pressure point. Egg-crate foam solves that by conforming. The peaks compress to match the contour of whatever sits on them, cradling irregular shapes and holding them without a rigid grip. It is also efficient with material: the convoluting process turns one block into two usable lids, which keeps the unit cost low. That combination of gentle, distributed pressure and economical production is why egg-crate is the default choice for case tops, where the job is simply to press the contents down and keep them from moving.
Fabrication and durability
We convolute PU or PE foam and die-cut it to the outline of your case or carton, holding the perimeter to ±0.5 mm so the lid drops in cleanly. Density is chosen for feel and recovery: a softer 1.2 to 2.0 lb/ft³ grade gives a plush, forgiving press for light goods, while a firmer grade in the mid range holds heavier contents down with more authority. Open-cell PU offers the softest touch and best conformance, while PE delivers more resilience for parts that need firmer restraint. Because the peaks share the load, the foam recovers its shape after compression and keeps performing through repeated open-and-close cycles in reusable cases.
Typical order scenarios
A tool-case maker pairs a routed foam base with an egg-crate lid so the top presses the tools into their pockets when the case closes. An electronics assembler uses a soft convoluted top layer over a tray of flat panels to prevent surface marking in transit. A gift-set brand adds a lightweight egg-crate cap inside a rigid box to keep contents from rattling. Whether you need twenty-five lids for a short run or thousands for a recurring case program, egg-crate is one of the most cost-effective ways to add even, reliable cushioning. Send your case dimensions and we will cut a proof, usually within one business day.
Best Fit
Who this insert suits
Lids that hold contents down
Egg-crate tops press tools and gear into a routed base so nothing shifts when the case is carried or dropped.
Surfaces protected from marking
Distributed peak pressure cushions panels and glossy parts without the point loads a flat pad can leave.
Lightweight anti-rattle caps
An economical top layer keeps contents seated and quiet inside rigid boxes at low unit cost.
Get a custom quote on egg-crate foam
Send your case or carton dimensions and the products inside. We return a design proof for the lid and base, usually within one business day.
Get a Custom Quote