Aluminum ER1188-F vs ER1188-O
Aluminum · ER1188 temper comparison
ER1188-F and ER1188-O are two conditions of the same aluminum grade, ER1188: F (as fabricated) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. ER1188-F is the stronger of the two: yield strength 50 MPa (7.25 ksi) against 22 MPa (3.19 ksi) for ER1188-O, about 127% more; tensile strength follows at 85 MPa (12.3 ksi) vs 60 MPa (8.7 ksi). In exchange, ER1188-O is the more ductile: elongation 45% versus 20% for ER1188-F, and ER1188-F is harder (24 HB vs 18 HB). ER1188-O runs hotter in service (150°C vs 120°C continuous).
ER1188-FChoose it when strength drives the design.
ER1188-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ER1188-F vs ER1188-O: 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)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 68 GPa9.9 Msi · Shear Modulus 25.5 GPa3.7 Msi · Bulk Modulus 75 GPa10.9 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.7 g/cm³0.1 lb/in³ · Melting Point (Solidus) 657°C1,215 °F · Liquidus Temperature 660°C1,220 °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 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.6 µm/m·K13.1 µin/in·°F · Latent Heat of Fusion 397 J/g171 BTU/lb · Min Service Temperature -269°C-452 °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) -0.85 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 96 / 100 · Castability 45 / 100 · Brazeability / Solderability 85 / 100 · Polishability 92 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 240 MJ/kg103,182 BTU/lb · Embodied Carbon (primary production) 16 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 0%
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.
ER1188-F vs ER1188-O — frequently asked
Is ER1188-F stronger than ER1188-O?
Yes. ER1188-F has a typical yield strength of 50 MPa (7.25 ksi) against 22 MPa (3.19 ksi) for ER1188-O — about 127% more. Tensile strength is 85 MPa (12.3 ksi) vs 60 MPa (8.7 ksi).
Which condition does FabDigit quote by default, F or O?
AW is the default ER1188 condition in the FabDigit quote flow (neither F nor O). 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 ER1188-F over ER1188-O?
Pick ER1188-F when strength drives the design. Pick ER1188-O 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 ER1188-F and ER1188-O 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.