Aluminum ZL108-T6 vs ZL108-T7
Aluminum · ZL108 temper comparison
ZL108-T6 and ZL108-T7 are two conditions of the same aluminum grade, ZL108: T6 (solution heat treated and artificially aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. ZL108-T6 is the stronger of the two: yield strength 230 MPa (33.4 ksi) against 185 MPa (26.8 ksi) for ZL108-T7, about 24% more; tensile strength follows at 265 MPa (38.4 ksi) vs 225 MPa (32.6 ksi). In exchange, ZL108-T7 is the more ductile: elongation 1% versus 0.7% for ZL108-T6, and ZL108-T6 is harder (105 HB vs 95 HB). ZL108-T7 runs hotter in service (300°C vs 250°C continuous) and ZL108-T7 conducts electricity better (30 % IACS vs 27 % IACS).
ZL108-T6Choose it when strength drives the design.
ZL108-T7Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ZL108-T6 vs ZL108-T7: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all aluminum grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all aluminum grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 79 GPa11.5 Msi · Shear Modulus 29 GPa4.2 Msi · Bulk Modulus 76 GPa11 Msi · Poisson's Ratio 0.33 · Charpy V-Notch Impact (RT) 3 J2.2 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 2.68 g/cm³0.1 lb/in³ · Melting Point (Solidus) 516°C961 °F · Liquidus Temperature 566°C1,051 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 963 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 19.5 µm/m·K10.8 µin/in·°F · Latent Heat of Fusion 389 J/g167 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.78 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 40 / 100 · Formability (cold) 5 / 100 · Castability 92 / 100 · Brazeability / Solderability 30 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 60%
Strength versus weight
Yield strength against density for every aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
ZL108-T6 vs ZL108-T7 — frequently asked
Is ZL108-T6 stronger than ZL108-T7?
Yes. ZL108-T6 has a typical yield strength of 230 MPa (33.4 ksi) against 185 MPa (26.8 ksi) for ZL108-T7 — about 24% more. Tensile strength is 265 MPa (38.4 ksi) vs 225 MPa (32.6 ksi).
Which condition does FabDigit quote by default, T6 or T7?
T6 is the default ZL108 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose ZL108-T6 over ZL108-T7?
Pick ZL108-T6 when strength drives the design. Pick ZL108-T7 when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ZL108-T6 and ZL108-T7 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.