Wollastonite CAL vs Wollastonite ST
Ceramic · Wollastonite temper comparison
Wollastonite CAL and Wollastonite ST are two conditions of the same ceramic grade, Wollastonite: CAL (calcined / high-brightness ceramic grade) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. Wollastonite ST is the more ductile: elongation 0.3% versus 0.1% for Wollastonite CAL, and Wollastonite CAL is harder (400 HV vs 380 HV). Wollastonite CAL runs hotter in service (1,100°C vs 300°C continuous).
Wollastonite CALChoose it when the part sees heat.
Wollastonite STChoose it when the part is bent, formed or impact-loaded.
Wollastonite CAL vs Wollastonite ST: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all ceramic 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 ceramic 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.
Wollastonite CALWollastonite ST
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Elongation at Break
Compressive Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Shear Modulus 40 GPa5.8 Msi · Bulk Modulus 87 GPa12.6 Msi · Poisson's Ratio 0.29 · Tensile Strength (Ultimate) 350 MPa50.8 ksi · Flexural Strength 70 MPa10.2 ksi · Hardness, Mohs 4.5
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,540°C2,804 °F · Refractive Index 1.63
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 750 J/kg·K0.18 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 6.5 µm/m·K3.6 µin/in·°F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Dielectric Constant (1 MHz) 6.5 · Dissipation Factor (1 MHz) 8×10⁻⁴ · Volume Resistivity 1×10¹³ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 2 MJ/kg688 BTU/lb · Embodied Carbon (primary production) 0.12 kg CO₂/kg · Embodied Water 12 L/kg1.4 gal/lb · Typical Recycled Content 0%
Strength versus weight
Yield strength against density for every ceramic grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Wollastonite CAL vs Wollastonite ST — frequently asked
What is the difference between Wollastonite CAL and Wollastonite ST?
Wollastonite CAL and Wollastonite ST are two conditions of the same ceramic grade, Wollastonite: CAL (calcined / high-brightness ceramic grade) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. Wollastonite ST is the more ductile: elongation 0.3% versus 0.1% for Wollastonite CAL, and Wollastonite CAL is harder (400 HV vs 380 HV).
Which condition does FabDigit quote by default, CAL or ST?
ACIC is the default Wollastonite condition in the FabDigit quote flow (neither CAL nor ST). 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 Wollastonite CAL over Wollastonite ST?
Pick Wollastonite CAL when the part sees heat. Pick Wollastonite ST when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Wollastonite CAL and Wollastonite ST 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.