SMARTBLOCK® 750: sound-insulating block, Rw up to 56 dB
With SMARTBLOCK® 750 the range moves from thermal-insulating to sound-insulating blocks. The higher mass brings compressive strength to 4 N/mm² and the calculated sound reduction index up to 56 dB (plastered 50 cm wall). Equivalent conductivity stays at 0.1592 W/mK.
750kg/m³- Equivalent λ
- 0.1592 W/mK
- Compressive strength
- 4.00 N/mm²
- Wall U
- 1.724–0.299 W/m²K
- Calculated Rw
- 42–56 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.06.750 | 1000 × 60 × 200 mm | 9 kg | 5 | 1.724 | 0.580 | 2.9 h | 42 | — | PDF EN |
| B.10.750 | 500 × 100 × 200 mm | 7.5 kg | 10 | 1.203 | 0.831 | 5.1 h | 42 | EI 90 | PDF EN |
| B.15.750 | 500 × 150 × 200 mm | 11.25 kg | 10 | 0.873 | 1.146 | 8.1 h | 45 | EI 120 | PDF EN |
| B.20.750 | 500 × 200 × 200 mm | 15 kg | 10 | 0.685 | 1.460 | 11.0 h | 47 | EI 180 | PDF EN |
| B.25.750 | 500 × 250 × 200 mm | 18.75 kg | 10 | 0.564 | 1.774 | 14.0 h | 49 | EI 240 | PDF EN |
| B.33.750 | 500 × 330 × 200 mm | 24.75 kg | 10 | 0.439 | 2.276 | 18.7 h | 52 | EI 240 | PDF EN |
| B.40.750 | 250 × 400 × 200 mm | 15 kg | 20 | 0.368 | 2.716 | 22.8 h | 54 | EI 240 | PDF EN |
| B.50.750 | 250 × 500 × 200 mm | 18.75 kg | 20 | 0.299 | 3.344 | 28.7 h | 56 | 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 · 10 · 15 cmLining walls, internal partitions, external cavity walls.
- 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.33.750: nominal dimensions L 500 × W 330 × H 200 mm, tolerance D1, density 750 kg/m³ ±10%, equivalent thermal conductivity 0.1592 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 0.439 W/m²K and a calculated sound reduction index Rw of 52 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.
- 450High insulation, with more mass and a longer time lag.
- 600A balance of insulation, strength and acoustics.
- 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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