How should Isolon, Warmlex and Isolontape be stored, and what is their shelf life?

Short answer: Store Isolon 300/500, Warmlex and Isolontape in dry, closed premises, away from sunlight, chemicals and excessive heat. Use FIFO based on production dates. Detailed temperature limits are defined in the technical specifications and explained in a separate FAQ.

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This article summarises official storage recommendations from technical specifications for IXPE/EPE foams and self-adhesive tapes. It explains temperature limits, winter and summer storage specifics, palletisation rules and how shelf life differs from service life in real constructions.

Recommended storage conditions (general rules)

For insulation materials Isolon 300/500 (IXPE), Warmlex (non-crosslinked EPE) and self-adhesive Isolontape, the general storage recommendations are:

• Dry, closed warehouse — protect from rain, snow, condensation and ground moisture.
• Avoid overheating — do not store near radiators, heaters, hot pipes or closed unventilated spaces.
• Temperature: keep within the limits specified in the technical documentation; avoid prolonged exposure to elevated temperatures above normal warehouse conditions.
• No direct sunlight — prolonged UV exposure is not allowed even through transparent surfaces.
• No solvents or aggressive chemicals — especially important for adhesive-backed products.
• Correct pallet storage — rolls should be stored vertically on pallets; avoid excessive stacking pressure.

Short deviations (e.g. during transport or loading) are usually acceptable if the material is not overheated, frozen while compressed, or mechanically damaged.

Winter and summer storage specifics

Winter: the material tolerates sub-zero temperatures well. However, before installation, rolls must be conditioned at room temperature (typically 12–24 hours) to stabilise elasticity and dimensions.

Summer: avoid prolonged exposure to temperatures above +40–45 °C. Do not store rolls under direct sunlight, inside hot vehicles or in sealed unventilated containers.

Shelf life vs service life

It is important to distinguish between shelf life in storage and service life in finished constructions.

— Shelf life: the period during which the material retains its declared properties under recommended storage conditions.
— Service life: how long the installed system works in practice (flooring, HVAC, vibration isolation, sealing, packaging, etc.).

Typical shelf life under correct storage:

• Isolon 300/500 and Warmlex — at least 12 months, often 12–24 months.
• Isolontape (self-adhesive) — 6–12 months depending on the adhesive system.

The actual service life of installed systems is usually much longer and mainly determined by design, operating temperature, loads and UV exposure.

Checklist for EU buyers and warehouse teams

— use FIFO (first in, first out) based on production and packing dates;
— avoid outdoor storage even in closed packaging;
— ensure rolls are stored vertically and not deformed by stacking pressure;
— keep distance from paints, solvents and oils;
— for long-term projects, confirm shelf life and storage window in advance.

Frequently asked questions

• Can freezing damage the material? No. IXPE/EPE foams tolerate freezing well. The material should simply be allowed to warm up to room temperature before installation.
• Can the material be used after the stated shelf life? In many cases yes, but properties must be checked. For self-adhesive tapes, adhesion should always be verified.