PE vs. PU vs. XLPE Foam: How to Choose Custom Foam Inserts for Industrial Parts

Choose polyethylene (PE) foam for heavier parts and repeated shocks, polyurethane (PU) foam for lightweight or delicate items that need soft cushioning, and cross-linked polyethylene (XLPE) when you need a smooth, non-abrasive, chemical resistant surface against painted or high value parts. All three can be cut into custom inserts that hold each part in place so it cannot move in transit.

What is polyethylene (PE) foam best for?

PE is a closed-cell foam that supports high loads and absorbs repeated impacts without losing its shape. It is the workhorse for industrial parts, heavy components and returnable inserts that cycle many times.

What is polyurethane (PU) foam best for?

PU is an open-cell foam that is soft and flexible. It conforms around lightweight, fragile or irregular items and is a common choice for cushioning electronics, instruments and small assemblies.

When should you use cross-linked polyethylene (XLPE)?

XLPE has a finer cell structure, a smooth non-abrasive surface and high chemical resistance. It is the premium choice for painted, polished or Class A components and for parts where a clean, professional insert matters.

Quick comparison

• Heavy parts, repeated shocks, returnable use: PE foam.

• Light, delicate or irregular items: PU foam.

• Sensitive finishes, chemical exposure, premium presentation: XLPE foam.

• Mixed requirements: combine foam with corrugated or plastic corrugated in one assembly.

Can foam inserts be returnable?

Yes. Foam inserts can be built as expendable one-way packaging or as durable inserts inside returnable totes and containers. PE and XLPE hold up best to repeated cycles.

Who designs custom foam inserts in Michigan?

Allpacks designs custom PE, PU and XLPE foam inserts and dunnage from Flint, Michigan, and can integrate foam with corrugated and wood into complete, dock-ready assemblies. See protective foam or request a quote.

Frequently asked questions

What is the difference between PE and PU foam?

PE (polyethylene) is a closed-cell foam that supports heavy loads and repeated impacts. PU (polyurethane) is a soft, open-cell foam suited to cushioning lightweight or delicate items.

What is XLPE foam used for?

Cross-linked polyethylene (XLPE) foam is used where a smooth, non-abrasive, chemical resistant surface is needed, such as painted, polished or Class A automotive components.

Which foam is best for returnable packaging?

PE and XLPE foam hold their shape through repeated cycles, which makes them the usual choices for returnable inserts.