AZ91/SiC/15p F vs AZ91/SiC/15p T4
Composite · AZ91/SiC/15p grade comparison
AZ91/SiC/15p F and AZ91/SiC/15p T4 are two grades of the same composite grade, AZ91/SiC/15p: F (as fabricated) versus T4 (solution heat treated and naturally aged). The chemistry is identical, so every difference below comes from the condition. AZ91/SiC/15p F is the stronger of the two: yield strength 130 MPa (18.9 ksi) against 120 MPa (17.4 ksi) for AZ91/SiC/15p T4, about 8% more. In exchange, AZ91/SiC/15p T4 is the more ductile: elongation 2.5% versus 1.2% for AZ91/SiC/15p F. AZ91/SiC/15p F runs hotter in service (150°C vs 120°C continuous) and AZ91/SiC/15p F conducts heat better (75 W/m·K vs 66 W/m·K).
AZ91/SiC/15p FChoose it when strength drives the design, or when the part sees heat.
AZ91/SiC/15p T4Choose it when the part is bent, formed or impact-loaded.
AZ91/SiC/15p F vs AZ91/SiC/15p T4: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite 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 composite 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
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Same in both: Elastic (Young's) Modulus 57 GPa8.3 Msi · Shear Modulus 21.8 GPa3.2 Msi · Bulk Modulus 50 GPa7.3 Msi · Poisson's Ratio 0.31 · Compressive Modulus 57 GPa8.3 Msi · Flexural Modulus 56 GPa8.1 Msi
Physical
Density and transition temperatures.
Same in both: Density 2.02 g/cm³0.07 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 970 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.5 µm/m·K11.9 µin/in·°F · Min Service Temperature -50°C-58 °F · Max Service Temperature (short-term) 200°C392 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 45 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 300 MJ/kg128,977 BTU/lb · Embodied Carbon (primary production) 30 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 5%
Strength versus weight
Yield strength against density for every composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
AZ91/SiC/15p F vs AZ91/SiC/15p T4 — frequently asked
Is AZ91/SiC/15p F stronger than AZ91/SiC/15p T4?
Yes. AZ91/SiC/15p F has a typical yield strength of 130 MPa (18.9 ksi) against 120 MPa (17.4 ksi) for AZ91/SiC/15p T4 — about 8% more. Tensile strength is 200 MPa (29 ksi) vs 230 MPa (33.4 ksi).
Which grade does FabDigit quote by default, F or T4?
F is the default AZ91/SiC/15p 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 AZ91/SiC/15p F over AZ91/SiC/15p T4?
Pick AZ91/SiC/15p F when strength drives the design, or when the part sees heat. Pick AZ91/SiC/15p T4 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ91/SiC/15p F and AZ91/SiC/15p T4 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.