2026-10-21
Two ceramsite shells, one flame-retardant XPS core. A1 fire rating, K=0.35, mass-spring-mass sound control — one block, no add-on system.
The modular sandwich block's structure is plain: two ceramsite concrete shells with a flame-retardant XPS (extruded polystyrene) insulation core between them. Do not underestimate those three layers — fireproofing, insulation and soundproofing are done by this single wall, no add-on system.
Why XPS is worth it. Extruded polystyrene is made by heating and extruding polystyrene into a closed-cell board — thermal conductivity 0.028–0.034 W/(m·K), the lowest tier among common insulants; the closed-cell structure does not absorb water, so in humid Gulf conditions it neither soaks nor loses performance.
Fire is the first line. The whole block is rated A1 non-combustible; the XPS core is the flame-retardant grade and is fully enclosed by two ceramsite shells — for fire to reach the core it must first burn through a non-combustible shell. This is completely different from externally applied XPS board, which is exposed, ignites easily and feeds a fire.
Soundproofing comes from mass-spring-mass. Two dense ceramsite layers are the mass, the XPS between them is the spring: a sound wave is partly reflected by the first layer, absorbed and attenuated as it crosses the core, then blocked again at the second layer. A sandwich structure is inherently quieter than a solid block of the same thickness — car sound panels and studio partitions use the same principle.
Insulation is the third. A single-leaf wall with heat-transfer coefficient K=0.35 W/(m²·K) meets 75%+ energy-saving targets. A hollow brick or ordinary block needs 5–8 cm of external insulation board, render and mesh to reach the same thermal performance — three extra operations. The sandwich block is finished the moment it is laid.
The comparison is direct: ETICS (external insulation) is prone to detachment, ignition and short service life, and needs on-site rendering and mesh; hollow bricks are thermally poor and need added insulation; AAC is thermally good but relies on thickness for fire and is average on sound. The sandwich block stacks all three into one block instead of a layered system.
Best-fit use cases: hospital wards (sound + fire), school classrooms, hotel rooms, apartment party walls (sound), and fire-compartment walls in high-rise cores and escape routes. These places usually demand both fire rating and quiet at the same time — the sandwich block meets both in one item.
Numbers: A1 fire rating, K=0.35 W/(m²·K), density 700 kg/m³, standard size 600×240×240 mm, flame-retardant XPS core. Shipped FCL from Ningbo with CNAS reports. For fire and acoustic test data we can provide the corresponding GB/T 29060-2012 documents directly.
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