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BS EN ISO 10140-2BS EN ISO 717-1BS EN 14449Acoustic Design of Schools (BB93)Approved Document EReviewed Technical Specification

Acoustic Laminated Glazing

Viscoelastic damping interlayers designed to flatten the acoustic coincidence dip and silence commercial environments.

Engineering Definition: Specialised laminated glass incorporating an engineered tri-layer polyvinyl butyral core with a micro-viscoelastic damping center that dissipates acoustic energy into negligible thermal vibration (BS EN ISO 10140-2 / BS EN ISO 717-1).
Precision Specification

Composite Architectural Glass Assembly

Multi-Ply Safety Specification

Accessible Static View
10.0mm1.52mm10.0mm

Schematic exploded horizontal cross-section showing sequential structural placement.

01
Outer Structural Ply(Thermally Toughened Glass)
10.0mmExternal impact and wind barrier
02
Engineered Interlayer Core(Structural SentryGlas / Acoustic PVB)
1.52mmViscoelastic damping & residual load support
03
Inner Structural Ply(Thermally Toughened Glass)
10.0mmInterior barrier and post-breakage integrity
BS EN 12150 / BS EN 14449 Architectural ReferenceIllustrative diagram — project structural verification required
Physical & Mechanical Performance Characteristics
Safety Class:Class 1B1 (BS EN 12600)
Bending Strength:Equivalent to laminated safety glass; prevents shatter spall and retains acoustic seal post-fracture
Thermal Shock Resistance:Dependent on annealed vs toughened plies; annealed acoustic ~40°C, toughened acoustic up to 200°C
Fracture Behaviour:Cracks remain adhered to acoustic membrane; continuous sound barrier preserved
Typical U-Value (Ug):5.4 W/m²K monolithic; 1.0 to 1.3 W/m²K in sealed insulating units
Acoustic Reduction (Rw):Rw 36 (-1; -3) dB (6.8mm) up to Rw 52 (-2; -7) dB (engineered dual-laminate double glazed cavity with 100mm gap)
Max Sheet Dimension:Up to 3210mm × 6000mm
Density & Mass:2.50 kg/m² per mm glass thickness + ~0.85 kg/m² per 0.76mm acoustic PVB

Key Architectural Advantages

  • •Eliminates the critical frequency "coincidence dip" where standard single glass experiences severe sound leakage (typically 1000–2500 Hz)
  • •Provides confidential acoustic privacy for commercial boardrooms, medical consulting rooms, and legal suites
  • •Exceptional low-frequency traffic noise (Ctr) reduction when combined in asymmetric double glazed units (e.g. 10mm Toughened + Cavity + 8.8mm Acoustic Lam)

Critical Engineering Constraints

  • •Acoustic performance is ONLY as good as perimeter gaskets; a 1mm air gap destroys 5 to 10 dB of acoustic rating
  • •Monolithic glass thickness increases weight linearly; asymmetric plies achieve better acoustic performance than thicker symmetric panes
  • •Must verify frame and ceiling flanking transmission paths (sound travelling through suspended ceilings or floor tracks)

Fabrication & Edge Processing Tolerances

Cut After Toughening:Permitted (Cold Cut)
Heat Soak Testing (HST):Not Required
Dimensional Tolerance:Panes <= 2000mm: ±2.0mm; panes > 2000mm: ±3.0mm (BS EN 14449)
Thickness Tolerance:6.8mm: ±0.4mm; 8.8mm: ±0.4mm; 10.8mm: ±0.5mm; 12.8mm: ±0.5mm
Flatness & Roller Wave:Annealed acoustic laminate: max bow 1.5mm/m; Toughened acoustic laminate: max 3.0mm/m
Hole & Cutout Geometry Rules:Holes must be arrissed; min edge distance >= 2t

Annealed acoustic laminated glass can be cut with specialized automatic double-sided scoring and heating cut tables.

Structural Design Basis (Eurocodes / BS EN 16612)CEN / BSI Harmonised
Characteristic Strength:Constituent plies: fg,k = 45 N/mm² (annealed) / fb,k = 120 N/mm² (toughened)
Elastic Modulus (E):70,000 MPa (glass plies)
Poisson's Ratio (ν):0.22
Linear Expansion (α):9.0 × 10⁻⁶ K⁻¹
Design Bending Stress Formula (BS EN 16612):Effective thickness calculation per BS EN 16613 with acoustic PVB shear modulus G(t,T)

Architectural Specifier Checklist

Verify these technical criteria prior to contract documentation:

1Specify both Rw (general weighted sound reduction) and Rw + Ctr (traffic and low-frequency urban correction).
2Specify asymmetric glass combinations (e.g. 6mm outer / 8.8mm inner) to ensure resonant frequencies do not align.
3Mandate tested drop-down acoustic threshold seals on all hinged glass access doors.
4Require acoustic mastic seals behind all perimeter tracking channels.

Frequent Commercial Applications

Executive Boardrooms & Acoustic Pods
Single and double-glazed acoustic partitions targeting 40–48 dB Rw.
Urban Hotel & Residential Facades
Façade glazing dampening sirens, trains, and flight path acoustic disturbance.
Sound Recording & Broadcast Studios
Dual decoupled structural glass partitions with unequal cavity depths.
Network Procurement Routing

BuyGlass.co

Commercial cut-to-size glass manufacturing, direct supply, and transactional quoting platform.

Recommended Action: Specify target Rw dB rating and obtain acoustic partitioning quotes.
Proceed to BuyGlass.co
Reviewed by: Principal Architectural Acoustician, BuyGlass Editorial Panel
Last Standard Verification: 2026-10-30