2026-09-26
Extruded polystyrene — the closed-cell foam core sandwiched inside our composite blocks.
The bright blue board you see in product photos is XPS — extruded polystyrene foam. It is made by extruding polystyrene resin through a die under high pressure, which creates a fully closed-cell structure. Every cell is a tiny sealed air pocket, which is why XPS has one of the lowest thermal conductivities among common insulation foams: around 0.030 W/(m·K).
Closed-cell matters beyond thermal numbers. It means the board does not absorb water when it gets wet — a real advantage in Australian climates with driving rain and coastal humidity. It also means high compressive strength (200–700 kPa depending on density), so the core does not crush under structural loads.
In our foam concrete sandwich blocks, XPS does one precise job: it carries the thermal performance. The block's outer foam concrete shell (700 kg/m³, MU5.0) handles structure, fixing and fire. The 30–50 mm XPS core in the middle handles insulation. Together they deliver a heat-transfer coefficient K around 0.35 W/(m²·K) — meeting China's 75% energy-saving standard in a single 240 mm leaf.
We specify flame-retardant XPS, not the generic construction-grade board. The additive slows flame spread and prevents dripping. Combined with the inorganic foam-concrete outer shell, the whole block rates A1 non-combustible — the outer body does not burn at all, and the core self-extinguishes.
For Australian projects, the practical implication is this: you get a masonry wall that looks, builds and fixes like normal blockwork, but performs like a wall with dedicated insulation. No separate insulation layer, no cavity, no trades to schedule. The XPS core is inside the wall and stays there for the building's life.
Need specifications or a quote?
Send us your product, quantity and destination port — we reply within 24 hours.
Contact Us
Hengshuo
