XPE foil-foam is a roll of closed-cell, chemically cross-linked polyethylene foam with a reflective face laminated to one or both sides. It is quoted under several names: foil foam insulation, foam-backed foil, reflective foam roll, IXPE foil (irradiation cross-linked), or simply “4 mm foil insulation”. This guide explains what the roll is, how it compares with foil-bubble, and what to state when asking for a quotation.
The construction
From one face to the other:
- Reflective face: aluminium foil or metallised PET film. Some grades carry an embossed pattern on a woven carrier for tear resistance.
- Adhesive or heat lamination bonding the face to the core.
- XPE core: closed-cell polyethylene foam, cross-linked so the cells hold their shape under heat and compression. Thickness is stated in millimetres.
- Second face: another reflective layer, a plain film, a coloured film, or the bare foam, depending on the grade.
The foam core gives the roll its thickness and resistance to conductive heat flow; the reflective face does its work only where it faces an air space, as explained in does reflective insulation work without an air gap.
Foil-foam compared with foil-bubble
| XPE foil-foam | Foil-bubble | |
|---|---|---|
| Core | Continuous closed-cell foam | Air bubbles trapped between film layers |
| Feel and handling | Soft, flat, cuts cleanly, lies flat on a surface | Springy, thicker for its weight, creases at the bubble rows |
| Compression | Recovers from moderate compression | Bubbles can be crushed permanently |
| Typical thicknesses | A few millimetres, quoted exactly | Single or double bubble, quoted by layer count |
| Common uses | Cooler bags and insulated packaging liners, equipment and pipe wraps, vehicle and container lining, under-floor and wall lining | Roof and wall radiant barriers, duct wrap, greenhouse lining |
Neither is “better”; the assembly decides. A liner that is folded and handled repeatedly favours foam; a wide, light roll for a roof space often favours bubble. Our comparison foil-bubble vs foil-foam vs foil-scrim goes further.
Where XPE foil-foam is used
- Cold chain and insulated packaging: liners for cooler bags, insulated boxes and shipping envelopes, where a flat, flexible roll that converts cleanly matters.
- Equipment and machinery: heat-reflective wraps and enclosure linings where a soft, closed-cell layer also damps noise and vibration.
- Building and industrial: under-floor, wall and container lining, pipe and duct wrap, as one layer of an assembly that provides an air space.
What a quotation needs
- Core thickness in millimetres, and whether it is XPE or IXPE if your process cares.
- Faces: foil or metallised film; one side or both; embossed or plain; colour of any non-reflective face.
- Finished weight or density if you have a target, or a reference sample.
- Service conditions: temperature range, exposure, and whether the roll will be folded, stitched or glued downstream.
- Evidence required: thermal values and fire classes apply to a specific construction and test method. Name the standard and the market, and ask whether a report exists for the quoted construction.
- Roll format: width, length, core diameter, and maximum roll weight for handling.
Supply scope
Our reflective insulation rolls, including XPE foil-foam, are made in our Shenzhen factory and slit to width. We supply roll goods only; converting into bags, liners or finished covers is done by our customers. Values are stated only where a document exists for the exact construction; send a sample or a drawing and the quotation will name the layers, thickness and format it covers.