BS EN 12150-1BS EN 14179 (Heat Soaked)CWCT Standard for Systemised Building EnvelopesReviewed Technical Specification
Decorative Ceramic Frit & Spandrel Glass
Opaque ceramic enamelled panels engineered to conceal floor slabs and structural building services while harmonising facade aesthetics.
Engineering Definition: Thermally toughened glass coated on Surface #2 or #4 with ceramic frit enamel paint that is permanently fired and fused into the glass surface during the 620°C toughening process (BS EN 12150-1 and BS EN 14179).
Material Construction Matrix
28mm High-Performance Insulating Glass Unit (IGU)
Thermal Transmittance:1.1 W/m²K
Acoustic Reduction:Rw 32 dB
Explode Layers
1
Outer Pane (Surface #1 & #2)(6mm Low-Iron Toughened)
6.0mm
2
Warm-Edge Spacer & Hermetic Seal(Composite Polymer & Butyl)
16.0mm
3
Argon Gas Cavity 90%(Noble Gas Fill)
16.0mm
4
Inner Pane (Surface #3 & #4)(6mm Toughened Low-E Soft Coat)
6.0mm
Physical & Mechanical Performance Characteristics
Safety Class:Class 1C1 (BS EN 12600)
Bending Strength:High mechanical strength; withstands high localized solar thermal stress
Thermal Shock Resistance:High thermal endurance (up to 200°C) essential for dark opaque solar heat absorption
Fracture Behaviour:Small granular safety dice; typically backed with insulation tray or laminated
Typical U-Value (Ug):Engineered as part of insulated back-pan assembly (U-value 0.15 to 0.25 W/m²K with mineral wool)
Acoustic Reduction (Rw):Rw 32 dB to 45 dB in spandrel cassette assembly
Max Sheet Dimension:Up to 3210mm × 6000mm
Density & Mass:2.50 kg/m² per mm glass thickness
Key Architectural Advantages
- •Flawless exterior facade continuity: harmonises colour and reflectivity between vision glass and slab-edge zones
- •Inorganic mineral ceramic enamel: 100% UV-resistant, scratch-proof, and will not peel, blister, or fade over building lifespan
- •Provides code-compliant non-combustible cladding integration (A1/A2 fire rating for enamelled glass plies)
Critical Engineering Constraints
- •High solar absorption in dark colours causes extreme internal cavity temperatures; requires ventilation or heat-soaking to prevent NiS spontaneous fracture
- •Must avoid "shadowbox" condensation issues by ensuring vapor-tight sealing of interior insulation trays
- •Ceramic frit weakens the base glass bending strength by approximately 15–20% compared to clear toughened glass
Fabrication & Edge Processing Tolerances
Cut After Toughening:PROHIBITED (Catastrophic Fracture)
Heat Soak Testing (HST):Recommended to BS EN 14179
All ceramic frit application and CNC processing must occur prior to the toughening and firing furnace.
Architectural Specifier Checklist
Verify these technical criteria prior to contract documentation:
1Mandate Heat Soak Testing (HST) to BS EN 14179 for all opaque spandrels due to extreme solar heat absorption.
2Specify RAL or NCS colour reference and check appearance against vision glass under both transmitted and reflected natural light.
3Confirm whether spandrel is monolithic with back insulation or part of a double-glazed shadowbox unit.
Frequent Commercial Applications
Curtain Wall Slab Edge Concealment
Opaque spandrel panels hiding intermediate concrete slabs and ductwork.
Commercial Kitchen & Retail Cladding
Hygienic, easily cleaned back-painted glass wall panels and splashbacks.
Architectural Privacy Screen Fritting
Gradient dot or line ceramic fritting for visual manifestation and glare control.
Network Procurement Routing
BuyGlass.co
Commercial cut-to-size glass manufacturing, direct supply, and transactional quoting platform.
Recommended Action: Request physical coated glass samples under natural daylight and consult facade processor.
Proceed to BuyGlass.coReviewed by: Commercial Envelope Consultant, BuyGlass Editorial Panel
Last Standard Verification: 2026-10-30