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M1 Polystyrene Beads Insulation - Volume Selection
M1 Polystyrene Beads: High-Performance Insulation at Your Fingertips
Are you looking for an effective and affordable solution to insulate your home? M1 fire-resistant polystyrene beads are ideal for optimizing thermal and acoustic insulation. They reduce heat loss in winter, keep cool in summer, and make your interior quieter, for a daily comfort that changes everything.
Why choose our M1 polystyrene beads?
- Economical: Excellent value for money for durable insulation, without breaking the bank.
- Simplified installation: Perfect for hollow walls, attics, floors or lightweight concrete, they are easy to install, even for non-professionals.
- Protection against moisture: They are rot-proof, preventing condensation and mold for a healthy environment.
- Guaranteed silence: They absorb external and internal noises, for a quieter home.
The most popular uses
- Hollow walls, partitions, attics and floors: Robust thermal and acoustic insulation for optimal comfort and energy savings.
- Crawl spaces and under-slab: They block the cold and moisture from the ground, protecting your home from water rising.
- In-ground pools, roofs, cellars and basements: They improve thermal comfort while reducing your energy bills.

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Discover why our insulating polystyrene beads offer the best value for money on the market.
In our French factory, we produce high-quality M1 polystyrene beads, designed to meet the needs of professionals and individuals alike. Thanks to our ability to manufacture large volumes, we offer unbeatable prices without ever skimping on performance and reliability.
Technical characteristics
- Density: 10 to 15 g/L (10 to 15 kg/m³)
- Diameter: 2 to 4 mm
- Fire-resistant: Classified M1 for optimal safety
- Thermal conductivity (lambda): 0.028 to 0.031 W/m·K for efficient thermal insulation
A versatile solution
Our M1 polystyrene beads adapt to multiple uses for your insulation projects and much more:
- Thermal and acoustic insulation: Ideal for walls, attics, floors or partitions, they boost comfort and reduce energy bills.
- Pipe protection: They effectively protect against freezing, even in the harshest winter conditions.
- Drainage: Their structure prevents water accumulation, perfect for crawl spaces or under-slab.
For optimal wall insulation, aim for an average thickness of 12 to 18 cm. Need advice for your construction site? Contact us, we guide you without fuss!
Performance isolation and differences between types of balls.
How do you know if your M1 polystyrene beads insulate well? Everything depends on the lambda (λ) value, which measures thermal conductivity. In other words, the lower this value, the more effectively your beads block heat or cold. Our M1 beads offer a lambda between 0.028 and 0.031 W/m·K, which guarantees efficient thermal insulation for your walls, attics or floors, while reducing your energy expenses.
IMPORTANT: There are different types of polystyrene beads.
Discover our new polystyrene beads, a reference in insulation with a lambda of 0.028 to 0.031 W/mK, guaranteeing optimal performance.

New white marbles isolate better (Are M1 FIRE-PROOF) than recycled graphite marbles. They are very easy to spot, they are perfectly round and dust-free.
The recycled graphite black polystyrene insulates poorly and resists little to temperature variations, promoting condensation and mold. Some sellers sell it as new: stay vigilant and choose new beads for reliable insulation.

The recycled graphite balls for insulation contain graphite, have a lower insulation value and are not M1 FIRE-PROOF, they can sometimes pose a fire risk. They are easily recognized by the shape of the ball which is broken or deformed with dust.
Effective insulation with M1 Fire-Rated Polystyrene Beads Properties of "Poly Xpansion®" Beads
The M1 Poly Xpansion® polystyrene beads offer high-level thermal and acoustic insulation for your home. Thanks to their breathable structure, they evacuate moisture to maintain a healthy indoor air, without risk of mold. Rot-proof and stable, they do not settle over time, guaranteeing lasting performance without the need for maintenance.


Perfect Insulation of Hollow Walls and Partitions with Polystyrene Beads
The M1 Poly Xpansion® polystyrene beads are perfect for insulating hollow walls and partitions. Ultra-light and easy to install, they minimize thermal bridges, reduce heat loss and boost the comfort of your interior all year round.
Use of polystyrene beads in attics and under-roofing
The M1 Poly Xpansion® polystyrene beads ensure effective and secure thermal insulation for attics and under-roofs, these areas particularly sensitive to temperature fluctuations that can cause significant energy losses.


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Use our polystyrene bead blower, it's the ideal tool for injecting polystyrene beads into the walls.
Simplify your insulation work with our M1 polystyrene bead blower injector. Fast, accurate and easy to use, it ensures a uniform application of the beads for optimal thermal and acoustic insulation, whether you are an individual or a professional.
Our polystyrene beads are packaged in cardboard or in big bags for shipments.
