Home > Companies > Oscar Acoustics > Colinwell EchoCheck Acoustic Blocks

Concrete cellular facing blocks with enhanced acoustic properties; sound reverberation cancellation is based on the Helmholst resonator principle. They have been specifically designed to reduce noise reverberation in both internal and external applications, giving acoustic clarity to speech and reducing noise levels of machinery, plantrooms, transport loading yards and sports hall noise, etc. The product manufacture has ISO 9001 and ISO 14001 accreditation.

Typical applications:

Ideal for use in sports halls, swimming pools, gymnasiums, public halls and lecture theatres. Also loading bays, anaerobic digesters, plant rooms, factories, external road and railway/ road sound barriers, bus stations, train stations, road and rail tunnels.

Related literature

The following content references this product:

Standard product features




Manufactured from cement, specially selected graded aggregates (65% recycled secondary aggregate content), an integral waterproofer and pigment.


Group 2.

Technical properties:

  • Average density: 2100 Kg/m³.
  • Compressive strength: 10.5 N/mm².
  • Moisture movement (maximum): 0.15 mm/m.
  • Shear bond strength: 0.15 N/mm².
  • Thermal conductivity: 2 W/m²K.
  • Water absorption: 3–6%.

Sound absorption coefficient (to BS EN ISO 354):

  • 125 Hz: 0.23 (EC100), 0.55 (EC140), 0.75 (EC215).
  • 250 Hz: 0.75 (EC100), 0.80 (EC140 and EC215).
  • 500 Hz: 0.70 (EC100), 0.70 (EC 140 and EC215).
  • 1000 Hz: 0.44 (EC100), 0.55 (EC140), 0.60 (EC215).
  • 2000 Hz: 0.42 (EC100), 0.45 (EC140), 0.55 (EC215).
  • 4000 Hz: 0.39 (EC100), 0.45 (EC140), 0.55 (EC215).


Colinwell Standard Blocks and Acousta Tex Blocks:

Available in the same sizes and colour options and can be used in conjunction with EchoCheck blocks for continuity of finish. Acousta Tex blocks have enhanced acoustic properties at the higher sound frequencies due to a specific textured finish.

Consult Oscar Acoustics for the acoustic properties of Acousta Tex blocks.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-80-50/300 Aggregate concrete blocks

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Oscar Acoustics


+44 (0)1474 854902

Product reference

Colinwell EchoCheck Acoustic Blocks


440 x 215 x 100 mm, 160 kg/m².
440 x 215 x 140 mm, 170 kg/m².
440 x 215 x 215 mm, 240 kg/m².


Recommended mortar: Maroon U53.
Recommended mortar: Brown H21.
Recommended mortar: Beige E74.
Recommended mortar: Cream G89.
Recommended mortar: Green N70.
Recommended mortar: Maroon U43.
Recommended mortar: Tan C30.
Recommended mortar: White J88.
Recommended mortar: Ochre R95.
Recommended mortar: Orange T36.
Recommended mortar: Coral A80.
Recommended mortar: Yellow D10.
Recommended mortar: Cream G89.
Recommended mortar: Black L62.
Recommended mortar: White J88.

Manufacturer details

Crowhurst Barn,
Crowhurst Lane,
West Kingsdown,
Kent, TN15 6JE
Tel +44 (0)1474 854902
Fax +44 (0)1474 853337
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NBS National BIM Library