mineral / Glass / Glass Products
Glass Panel - Structural
High-performance structural glazing panels for curtain wall and facade applications with safety glass specifications
Atlas code
MIN-GLA-PRO-006
At-a-glance signals
High-performance structural glazing panels for curtain wall and facade applications with safety glass specifications
Overview
Executive summary
Structural glazing panels are high-performance glass elements used in curtain wall facades, structural glazing systems, and point-fixed applications where glass serves as the primary weather barrier and architectural surface. These panels are manufactured from soda-lime silicate float glass that is heat-treated (toughened/tempered or heat-strengthened) and/or laminated to achieve the required safety, structural, and fire performance characteristics. Standard configurations include single-glazed toughened, laminated safety glass (two or more plies bonded with PVB or SGP interlayer), and insulating glass units (IGUs) combining two or more panes with sealed air or argon-filled cavities for thermal performance. In Australian construction, structural glass panels must comply with AS 1288 Glass in buildings - Selection and installation, and are commonly used in commercial curtain walls, shopfronts, balustrades, canopies, and point-fixed facades. NCC 2022 amendments have significantly tightened fire performance requirements, with fire-rated glazing now requiring FRL -/120/120 in many commercial applications. Glass is classified as non-combustible under the NCC.
Best when…
- Maximum natural daylighting and visual transparency
- Excellent compressive strength (>1000 MPa) and stiffness (70 GPa)
- Non-combustible material classification under NCC
- Wide range of performance coatings (low-E, solar control, self-cleaning)
- IGU configurations achieve good thermal performance (U-value 1.1-2.8 W/m2K)
- Laminated glass provides acoustic performance up to STC 45+
- Durable and low-maintenance surface (50-100+ year lifespan)
- Design flexibility with clear, tinted, patterned, printed, and smart glass options
Top advantages
- 01 Maximum natural daylighting and visual transparency
- 02 Excellent compressive strength (>1000 MPa) and stiffness (70 GPa)
- 03 Non-combustible material classification under NCC
- 04 Wide range of performance coatings (low-E, solar control, self-cleaning)
- 05 IGU configurations achieve good thermal performance (U-value 1.1-2.8 W/m2K)
Top limitations
- 01 High embodied carbon from energy-intensive manufacturing (~1500 degC melting)
- 02 Poor thermal performance as single glazing requiring IGU systems for compliance
- 03 Brittle failure mode - toughened glass fragments, laminated retains but cracks
- 04 High installed cost for structural glazing systems ($300-750+/m2)
- 05 Solar heat gain requires careful management (coatings, shading, orientation)
Technical
Physical ·9
- Density
- 2400-2520 kg/m3 Soda-lime silicate float glass. 2.5 kg/m2 per mm of thickness. Tempered glass ~2520 kg/m3. Source: material-properties.org, AIS Glass Code of Practice, Wikipedia
- Specific gravity
- 2.4-2.52 Soda-lime glass
- Porosity
- 0 % Glass is a non-porous amorphous solid
- Water absorption
- 0 % Glass is impervious to water
- Hardness
- 5.5-6.5 Mohs Soda-lime glass hardness. Scratch-resistant surface
- UV resistance
- Moderate (standard) to Excellent (laminated/low-E) Standard soda-lime glass blocks ~90% UVB but transmits most UVA (~75%). Low-E and laminated glass with PVB interlayer blocks >99% UV. Source: glass industry data
- Chemical resistance
- Excellent Excellent resistance to most chemicals, solvents, and cleaning agents. Only HF acid and strong hot alkalis attack glass
- pH tolerance
- 1-12 pH Resistant to most acids except hydrofluoric (HF). Strong alkalis can etch glass surface over extended exposure
- Surface roughness
- 0.1-1.0 um Float glass has extremely smooth surface on tin side. Air side may be slightly rougher. Fire-polished surfaces <1 um
Mechanical ·7
- Tensile strength
- 45-150 MPa Annealed ~45 MPa design. Heat-strengthened ~70 MPa. Fully toughened/tempered ~120-150 MPa (4x annealed). Source: AS 1288, structuralglass.org
- Compressive strength
- >1000 MPa Glass has extremely high compressive strength. Practical failure is always in tension at surface flaws. Source: structuralglass.org, AIS Glass
- Flexural strength
- 7-28 MPa Design flexural stress: annealed 7 MPa (AS 1288), toughened ~28 MPa. Characteristic strength higher. Source: AS 1288:2021
- Shear strength
- 15-30 MPa Glass shear strength approximately 50% of tensile strength
- Poisson's ratio
- 0.22 Soda-lime glass. Source: Schott TIE-31, material property databases
- Impact resistance
- Moderate-High J Toughened glass shatters into small cuboid fragments (safe). Laminated glass holds together on interlayer after fracture. Human impact tested per AS 1288 Grade A or B safety
- Creep resistance
- Excellent (glass), Moderate (PVB interlayer) Glass does not creep at ambient temperatures. PVB interlayer in laminated glass exhibits viscoelastic creep under sustained load - SGP interlayer has better creep resistance
Sustainability & Health
Embodied carbon & energy ·7
- Embodied carbon
- 0.55-1.20 kg CO2-eq/kg Float glass ~0.86 kg CO2-eq/kg (ICE database). Low-carbon glass ~0.55 kg CO2-eq/kg (Saint-Gobain ORAE, AGC Low-Carbon). Heat treatment adds ~10%. IGU fabrication adds ~12%. Source: University of Bath ICE, Vitro EPD, NGA industry EPD
- Carbon footprint
- 100-150 kg CO2-eq/m2 Per m2 of IGU facade including framing. Glass contribution 26-60% of total facade carbon. Complete curtain wall system ~100-150 kg CO2-eq/m2 facade area. Source: Arup carbon footprint of facades study, Facadetectonics, Walter P Moore
- Embodied energy
- 15-25 MJ/kg Energy-intensive manufacture at ~1500 degC. Float glass ~15 MJ/kg. Including processing (toughening, laminating, IGU) increases to 20-25 MJ/kg. Source: ICE database, industry EPDs
- Water footprint
- 5-15 L/kg Water used in float glass manufacturing for cooling. Moderate water consumption
- Recycled content
- 15-50 % Float glass typically contains 15-30% recycled cullet. Industry moving toward >50%. Low-carbon products have higher cullet content. Source: AGC, Saint-Gobain, Glass for Europe
- Renewable content
- 0 % No renewable content in glass. Some manufacturers transitioning to renewable energy for melting
- Circular score
- 4.5 /10 Glass is 100% recyclable as cullet. However, IGUs, laminated glass, and coated glass are difficult to separate for recycling. Curtain wall systems have moderate end-of-life recovery. Long lifespan reduces replacement frequency
Compliance & Fire
Fire performance ·6
- Combustibility class
- A1 (glass), A2 (laminated) Glass is regarded as non-combustible under the NCC. Classified A1 (Euroclass). Laminated glass with PVB may be A2 due to organic interlayer. Source: NCC, Adelaide Fire Engineers
- Fire resistance level
- 0-120 minutes Standard glass: no fire rating - cracks and falls out at ~250-350 degC. Fire-rated glazing (Pyranova, Pyran): 30, 60, 90, or 120 minutes FRL -/120/120. NCC 2022 requires FRL -/120/120 for many commercial applications. Source: NCC 2022, Australian Glass Group, Pilkington Pyranova
- Ignition temp
- N/A - non-combustible degC Glass does not ignite. PVB interlayer ignition ~340 degC but self-extinguishing
- Flame spread index
- 0 Zero flame spread - non-combustible
- Smoke dev. index
- 0-50 Glass produces zero smoke. Laminated glass PVB interlayer may produce minor smoke when exposed to extreme heat
- Heat release rate
- 0 kW/m2 Zero - glass is inorganic non-combustible material. PVB interlayer in laminated glass may contribute minor heat release
Cost & Lifecycle
Capex & lead time ·6
- Material cost (range)
- 38-500 AUD/m2 Float glass ~$38/m2. Low-iron ~$145/m2. Double-glazed IGU ~$200/m2. Laminated ~$320/m2. Fire-rated significantly more. Source: HIREtrades, Ecospecifier Australia
- Material cost (per unit)
- 150-350 AUD/m2 Typical commercial IGU (low-E, argon, 24mm overall). Source: industry estimates, glazing contractor data
- Lead time
- 5-60 days Standard float/toughened glass 5-15 days. Specialty coatings, large sizes, fire-rated 4-12 weeks. IGU fabrication 2-4 weeks. Source: Australian glazing industry
- Lifecycle cost
- 400-1200 AUD/m2 High initial cost but long lifespan. Includes cleaning, gasket replacement, and eventual IGU replacement. Curtain wall systems 40-60 year life
- Annual maintenance
- 5-25 AUD/m2/year Exterior cleaning, gasket inspection, sealant maintenance. High-rise facade maintenance includes access equipment costs
- Market availability
- Excellent Widely available in Australia. Major manufacturers: Viridian (CSR), Pilkington, Saint-Gobain. Fabricators in all capital cities. Fire-rated glass more limited availability
Service life & durability ·3
- Expected lifespan
- 40-60+ years Glass is indefinitely durable. IGU seal failure (fogging) typically occurs at 20-30+ years. Curtain wall system lifespan 40-60+ years with gasket/sealant replacement
- Maintenance interval
- 1-10 years Exterior cleaning annually to 5-yearly depending on environment. Gasket/sealant inspection every 5-10 years. IGU replacement as needed
- Warranty period
- 10-20 years IGU seal warranties typically 10-20 years. Glass material indefinite. Coating warranties vary by manufacturer
Layer D
Where it's used
Commercial curtain wall facades
Structural glazing systems
High-performance windows
Glass balustrades and barriers
Fire-rated glazing