SMARTBLOCK® 450: lightweight insulating block, λ 0.094
SMARTBLOCK® 450 adds a share of graded aggregates to the EPS mix. Conductivity stays low (0.094 W/mK) while the extra mass lengthens the thermal time lag and raises sound insulation: a plastered 33 cm wall has U 0.269 W/m²K, an 18.5-hour time lag and a calculated Rw of 49 dB.
450kg/m³- Equivalent λ
- 0.094 W/mK
- Compressive strength
- 0.40 N/mm²
- Wall U
- 1.188–0.181 W/m²K
- Calculated Rw
- 39–53 dB
- Reaction to fire
- A2-s1,d0 · EI 240
Thicknesses and wall data
Wall with 1.5 cm of traditional plaster on each side. Block height 20 cm.
| Code | Size L×W×H | Weight | Pcs/m² | U W/m²K | R m²K/W | Time lag | Rw dB | Fire | Sheet |
|---|---|---|---|---|---|---|---|---|---|
| B.06.450 | 1000 × 60 × 200 mm | 5.4 kg | 5 | 1.188 | 0.842 | 2.7 h | 39 | — | PDF EN |
| B.10.450 | 500 × 100 × 200 mm | 4.5 kg | 10 | 0.789 | 1.267 | 4.8 h | 39 | EI 90 | PDF EN |
| B.15.450 | 500 × 150 × 200 mm | 6.75 kg | 10 | 0.556 | 1.799 | 7.8 h | 41 | EI 120 | PDF EN |
| B.20.450 | 500 × 200 × 200 mm | 9 kg | 10 | 0.429 | 2.331 | 10.8 h | 44 | EI 180 | PDF EN |
| B.25.450 | 500 × 250 × 200 mm | 11.25 kg | 10 | 0.349 | 2.863 | 13.8 h | 46 | EI 240 | PDF EN |
| B.33.450 | 500 × 330 × 200 mm | 14.85 kg | 10 | 0.269 | 3.713 | 18.5 h | 49 | EI 240 | PDF EN |
| B.40.450 | 500 × 400 × 200 mm | 18 kg | 10 | 0.224 | 4.458 | 22.6 h | 51 | EI 240 | PDF EN |
| B.50.450 | 500 × 500 × 200 mm | 22.5 kg | 10 | 0.181 | 5.522 | 28.5 h | 53 | EI 240 | PDF EN |
U, R, time lag and Rw: ESB catalogue 11/2022. Fire resistance classes of the range for walls up to 4 m high. Rw calculated, not measured. ESB data sheets from 2014. Where no English version exists, the Italian sheet is linked.
Uses by thickness
- 6 cmExternal insulating cladding, lining walls, thermal-bridge protection on columns and beams, external cavity walls.
- 10 · 15 cmThe same uses as the 6 cm block, plus internal partitions.
- 20 · 25 cmSingle-layer external infill walls, cavity walls and internal partition walls.
- 33 · 40 · 50 cmSingle-layer external infill walls and internal partition walls.
Specification text
Choose the item and copy the text into your bill of quantities.
Masonry built with the SMARTBLOCK® building system by ESB S.r.l., consisting of solid blocks for walls to be plastered, suitable for internal and external walls, CE-marked to EN 771-3, category II, made of cement-based concrete with a super-lightweight insulating aggregate of virgin expanded polystyrene beads of controlled density and graded size (Ø 3–6 mm), treated during production for full workability with the hydraulic binder. Item B.33.450: nominal dimensions L 500 × W 330 × H 200 mm, tolerance D1, density 450 kg/m³ ±10%, equivalent thermal conductivity 0.094 W/mK, reaction to fire class A2-s1,d0 (EN 13501-1). The wall, plastered with 1.5 cm on both sides, will have a thermal transmittance U of 0.269 W/m²K and a calculated sound reduction index Rw of 49 dB. Laid with Malta Block 600 thermal mortar (EN 998-2, M2.5) with staggered joints. Including the forming of jambs and lintels, any special pieces, anchoring to the structure and reinforcement as required by the designer.
The other densities
- 300The most insulating density, for single-layer infill walls.
- 600A balance of insulation, strength and acoustics.
- 750The first sound-insulating density: partitions and walls between units.
- 900Load-bearing from 15 cm, with thermal and sound insulation.
- 1200The density with the most mass: load-bearing and sound-insulating.
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