Storing and transporting foam - compression, light and moisture

In storage terms foam is a grateful material - it doesn't spoil, doesn't corrode and has no classic expiry date. But three things measurably harm it.

Compression for transport

Sheets and rolls are often compressed for transport - legitimate, and it saves considerable space. The rules:

• The compressed state should last weeks, not months - over-long compression leaves permanent deformation, especially at low densities.
• After unpacking, foam needs 24–72 hours to regain full height and properties; do not install it before that.
• Viscoelastic foams recover more slowly than conventional ones - plan a longer rest time.

Light and yellowing

Polyurethane foam yellows under UV light. Two things matter:

• Yellowing is a surface, cosmetic effect - mechanical properties remain practically unchanged.
• For products where the foam is visible (filters, linings, decorative elements), store it in opaque packaging away from windows.

Moisture and temperature

• The warehouse should be dry and ventilated; foam absorbs moisture from the air and releases it slowly.
• Extreme temperatures are not a problem for the foam itself, but they change processing behaviour - a cold block cuts differently from a room-temperature one.
• Stack blocks and sheets on a flat base; resting on edges leaves an imprint.

Recommendation for customers

Order at the pace you install - foam sitting compressed in a warehouse corner for months loses exactly the properties you paid for. For recurring needs, arrange successive deliveries.