BS EN ISO 10140-2BS EN ISO 717-1BS EN 14449Acoustic Design of Schools (BB93)Reviewed 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).
Material Construction Matrix
21.52mm Structural Toughened Laminated Glass
Thermal Transmittance:5.2 W/m²K
Acoustic Reduction:Rw 41 dB
Explode Layers
1
Front Structural Glass Ply(10mm Heat-Soaked Toughened)
10.0mm
2
Structural Ionoplast Interlayer(SentryGlas Polymer Sheet)
1.52mm
3
Rear Structural Glass Ply(10mm Heat-Soaked Toughened)
10.0mm
Physical & Mechanical Performance Characteristics
Safety Class:Class 1B1 (BS EN 12600)
Bending Strength:Equivalent to laminated safety glass; prevents shatter spall
Thermal Shock Resistance:Dependent on annealed vs toughened plies; annealed acoustic ~40°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 units
Acoustic Reduction (Rw):Rw 36 dB (6.8mm) up to Rw 52 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
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 the perimeter acoustic 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
Annealed acoustic laminated glass can be cut with specialized automatic double-sided scoring and heating cut tables.
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.
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.coReviewed by: Principal Architectural Acoustician, BuyGlass Editorial Panel
Last Standard Verification: 2026-10-30