BASWA Phon | Seamless Monolithic Acoustic Plaster Systems
Arthur Acoustics is a certified UK installer of BASWA Phon, the world’s leading range of seamless, microporous acoustic plaster systems. Engineered in Switzerland for uncompromising architectural design, BASWA Phon eliminates unwanted reverberation while preserving clean, unbroken ceiling and wall planes without visible joints, perforated tiles, or suspended grids.
Architectural Freedom Without Acoustic Compromise
Contemporary spaces built with expansive glazing, stone, polished concrete, and timber frequently suffer from harsh echo and poor speech clarity. BASWA Phon transforms reverberant rooms into calm, balanced environments by absorbing up to 90% of reflected sound behind a hand-trowelled marble-sand finish.
-
Seamless Across Any Geometry. Installed across flat ceilings, vaulted arches, domes, curved walls, and deep coffers without unsightly expansion joints.
-
True Plaster Appearance. Hand-applied by trained craftsmen to replicate the timeless look and feel of traditional fine plasterwork.
-
Bespoke Custom Colours. Supplied in crisp architectural white (~NCS S 0500-N) or custom-tinted to match virtually any RAL or NCS colour specification.
-
Invisible Speaker Integration. Fully compatible with plastered-in speakers, allowing multi-room audio and cinema systems to remain completely hidden.
-
Non-Combustible & Sustainable. Carries a Euroclass A2-s1, d0 fire rating, is 100% VOC-free, and contributes towards BREEAM and LEED certifications.
Exploring the BASWA Phon System Range
The BASWA Phon portfolio offers single-coat and multi-coat options tailored to your aesthetic preference, budget, and project programme:
The BASWA Phon Base acoustic plaster has a smooth, no groove, slightly structured and mechanically relatively resilient surface. The key advantages: only small amounts of material are needed and the installation times are short. Overall, this product offers a very favorable price-performance ratio.
System profile
-
Single layer system
-
Granule size in the top coat 0.7 mm
-
Quick installation
-
Standard color ~ NCS S 0500-N
-
Comprehensive color choices (BASWA Colors, NCS, RAL, etc.)
-
Fire prevention class A2; S1-d0
Used as a single layer system, BASWA Phon Fine acoustic plaster has a smooth, fine surface structure. The key advantages: only small amounts of material are needed and the installation times are short.
System profile
-
Single layer system
-
Granule size in the top coat 0.5 mm
-
Fine surface structure
-
Quick installation
-
Standard color ~ NCS S 0500-N
-
Comprehensive color choices (BASWA Colors, NCS, RAL, etc.)
-
Fire prevention class A2; S1-d0
Double layer systems are used if the surface quality has to meet the highest standards. These requirements may pertain to how fine the surface structure is (BASWA Phon Classic Top – with BASWA Top 0.3 mm as the top coat), or they may be the result of other prerequisites (vaulted or double vaulted surfaces, surfaces with strong light exposure).
Double layer acoustic plaster systems require the placement of a first base coat BASWA Base on the glued acoustic panels, upon which a top coat (coating masses BASWA Base, Fine or Top) is subsequently applied.
System profile
-
Double layer systems
-
Granule size in the base coat 0.7 mm
-
Granule size in the top coat 0.7 mm / 0.5 mm / 0.3 mm
-
Finest surface structure (BASWA Classic Top)
-
Suitable for surfaces exposed to a lot of light or vaulted surfaces
-
Standard color ~ NCS S 0500-N
-
Comprehensive color selection (BASWA Colors, NCS, RAL, etc.)
-
Maximum surface quality <Q3>
-
Fire prevention class A2; S1-d0
Double layer systems are used if the surface quality has to meet the highest standards. These requirements may pertain to how fine the surface structure is, or they may be the result of other prerequisites (vaulted or double vaulted surfaces, surfaces with strong light exposure).
Double layer acoustic plaster systems require the placement of a first base coat BASWA Base on the glued acoustic panels, upon which a top coat (BASWA Fine ) is subsequently applied.
System profile
-
Double layer systems
-
Granule size in the base coat BASWA Base 0.7 mm
-
Granule size in the top coat BASWA Fine 0.5 mm
-
Very fine surface structure
-
Suitable for surfaces exposed to a lot of light or vaulted surfaces
-
Standard color ~ NCS S 0500-N
-
Comprehensive color selection (BASWA Colors, NCS, RAL, etc.)
-
Maximum surface quality <Q3>
-
Fire prevention class A2; S1-d0
Scientifically Tested Acoustic Performance
Every BASWA Phon system is independently laboratory-tested to deliver certified Class A sound absorption across four standard build-up depths:
-
30 mm System Depth. Achieves a certified 0.80 NRC rating—ideal where ceiling height is restricted, such as heritage and listed buildings.
-
40 mm System Depth. Achieves a certified 0.85 NRC rating for balanced speech and ambient noise control. [1]
-
50 mm System Depth. Delivers enhanced mid-to-low frequency absorption for open-plan commercial and residential spaces.
-
70 mm System Depth. Achieves a 0.90 to 1.00 NRC rating (maximum Class A absorption) for demanding acoustic environments, auditoriums, and listening rooms.
Nationwide Specification & Installation by Arthur Acoustics
From initial acoustic calculations and NBS specification support through to on-site installation, Arthur Acoustics provides a complete turnkey service across the UK. Our dedicated teams operate out of our Henlow Specification Centre on the Bedfordshire and Hertfordshire border, serving projects in London, Cambridge, Oxford, Manchester, and nationwide.
Request Sample Boxes or Visit Our Showroom
Compare the 0.3 mm, 0.5 mm, and 0.7 mm BASWA Phon finishes side by side. Contact our specification team to order complimentary architectural sample boxes or book a consultation at our Henlow showroom.
Call 01462 534610 or email info@arthuracoustics.co.uk to discuss your project.