Sheet · 0.55–3 mm
Metallic — indicative fig. M·85
Fire A1 Non-combustibleEmbodied carbon 2.20kgCO₂e/kg Medium–highCompressive 250MPa StructuralDesign life 50yr
Hot-dip galvanised steel sheet conforming to AS 1397:2021, featuring zinc coating for superior corrosion resistance. Available in thicknesses from 0.55mm to 3.00mm, suitable for roofing, cladding, and structural applications across all Australian climate zones.
01 Physical
Density 7850kg/m³
Specific gravity 7.85
Porosity 0%
Water absorption 0%
Hardness 120
UV resistance excellent
Chemical resistance good
pH tolerance 6-12
Surface roughness 1.5µm
02 Mechanical
Tensile strength 410MPa
Compressive strength 250MPa
Flexural strength 450MPa
Shear strength 260MPa
Poisson's ratio 0.3
Impact resistance moderate
Creep resistance excellent
03 Thermal
Thermal conductivity 50W/m·K
Specific heat 490J/kg·K
Thermal expansion 12×10⁻⁶/°C
04 Compliance & Fire First question
Combustibility class non-combustible
Fire resistance level non-combustible
Flame spread index 0
Smoke dev. index 2
Heat release rate 0
05 Sustainability & Health
Embodied carbon 2.2
Carbon footprint 1850
Embodied energy 25MJ/kg
Water footprint 45L/kg
Recyclability 100%
Recycled content 25%
Renewable content 0%
Circular score 8.5
VOC emissions 0
Toxicity rating non-toxic
LEED contribution 2
06 Durability · Cost · Logistics
Expected lifespan 50
Maintenance interval 15
Warranty period 15
Material cost (range) 45-85
Material cost (per unit) 65
Lead time 1-5
Lifecycle cost 120
Annual maintenance 0
Market availability excellent
07 Assessment
Advantages
- Non-combustible with Spread of Flame Index of 0
- Excellent corrosion resistance via sacrificial zinc protection
- Suitable for all BAL zones including BAL-FZ
- 90% recycling rate in Australia
- No maintenance required for 15-25 years in most environments
- Self-healing properties through zinc migration
- Readily available from Australian manufacturers
- Cost-effective life cycle performance
- Compatible with standard metalworking tools
- Magnetic properties enable easy separation for recycling
Constraints
- Zinc fumes toxic when heated above 250°C during welding
- Limited aesthetic options compared to pre-painted steel
- White rust formation possible in poor storage conditions
- Incompatible with copper and lead (galvanic corrosion)
- Weight penalty compared to aluminium alternatives
- Thermal bridging in uninsulated applications
- Cut edges require protection in severe environments
- Acoustic transmission requires additional treatment
- Embodied carbon of 1.4-2.2 kg CO₂/kg steel
08 Applications
A1 Roofing and wall cladding systems
A2 Bushfire-resistant construction (BAL-12.5 to BAL-FZ)
A3 Marine and coastal structures
A4 Agricultural buildings and infrastructure
A5 HVAC ducting and ventilation systems
A6 Automotive body panels
A7 Electrical enclosures and switchboards
A8 Rainwater goods and plumbing fixtures
A9 Structural decking and formwork
A10 Industrial storage systems
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.