What is foam density?
Density is the mass of foam per cubic metre, given in kg/m³. It describes how much material the foam contains, not how hard it feels on its own, although in practice higher density foams are usually firmer and carry more load.
How does density relate to product weight?
The heavier the part and the smaller the area it rests on, the higher the density it needs. A heavy part on low-density foam sinks to the bottom of the cavity and loses protection; a light part on very dense foam is barely cushioned and feels every shock.
What about fragile or sensitive products?
Fragile electronics, glass and instruments benefit from softer, lower-density foam or from a combination: a firm outer layer for structure and a softer inner layer that touches the product. Lamination makes such multi-density inserts possible.
Does the shipping route change the choice?
Yes. Parcel shipments face more drops and impacts than palletised freight, and returnable containers face many cycles. Rough routes and repeated use favour closed-cell PE or XLPE foam with a density that keeps its shape over time.
How do we confirm the right density?
FoamPackage proposes a material and density from your drawing, weight and route, then produces a sample insert. Testing the sample with your real product is the most reliable way to confirm the choice before series production.