Granite C615
Grade · default condition
ASTM C615
C615 = commercial dimension-stone granite
Default choice for cladding, paving, countertops and kerbs where standard ASTM C615 / GB/T 18601 minimums apply.
Values for the C615 condition
Other Granite tempers and conditions
Granite is listed in 3 conditions; see the grade overview at Granite.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
C615DefaultThis page Commercial dimension-stone granite | Default choice for cladding, paving, countertops and kerbs where standard ASTM C615 / GB/T 18601 minimums apply. | — | 12 | — | — | 3 W/m·K |
Commercial 'black granite' | Pick when maximum density, strength and a deep mirror polish matter (monuments, dark cladding, machine bases). | — | 16 | — | — | 2 W/m·K |
Metrology / surface-plate grade granite | Use for surface plates, CMM bases and machine-tool structures needing low CTE, no burring and long-term dimensional stability. | — | — | — | — | 2 W/m·K |
What is Granite C615?
Granite C615 is Granite in the C615 grade — default choice for cladding, paving, countertops and kerbs where standard ASTM C615 / GB/T 18601 minimums apply. Granite C615 has a tensile strength of 12 MPa (1.74 ksi), weaker than 68% of natural material grades. Elongation at break is 0.05% and the elastic modulus is 50 GPa (7.25 Msi). Granite C615 has a density of 2.68 g/cm³ (0.0968 lb/in³), heavier than 89% of natural material grades. It melts at 1,215°C (2,219 °F).
Advantages
- Conducts heat well — 2.9 W/m·K (1.68 BTU/hr·ft·°F), better than 96% of natural material grades
- Good corrosion resistance — 88/100, better than 96% of natural material grades
- Tough — resists crack growth — 1.2 MPa·√m (1.09 ksi·√in), better than 93% of natural material grades
- Stiff — 50 GPa (7.25 Msi), better than 88% of natural material grades
- High service temperature — 300°C (572 °F), better than 88% of natural material grades
Limitations
- Difficult to machine — 25/100, worse than 96% of natural material grades
- Limited ductility — 0.05%, worse than 94% of natural material grades
- Heavy — 2.68 g/cm³ (0.0968 lb/in³), worse than 89% of natural material grades
Granite C615 properties
Typical room-temperature values for Granite C615; 12 are specific to this condition. Other listed values are Granite reference data and may not represent this condition. Bars are the position among natural material grades.
Physical3
Granite C615 has a density of 2.68 g/cm³ (0.0968 lb/in³), heavier than 89% of natural material grades. It melts at 1,215°C (2,219 °F).
Mechanical12
Granite C615 has a tensile strength of 12 MPa (1.74 ksi), weaker than 68% of natural material grades. Elongation at break is 0.05% and the elastic modulus is 50 GPa (7.25 Msi).
Thermal5
Granite C615 is rated for continuous service to 300°C (572 °F). It conducts heat at 2.9 W/m·K (1.68 BTU/hr·ft·°F), better than 96% of natural material grades. Thermal expansion is 8 µm/m·K (4.44 µin/in·°F).
Electrical1
Granite C615 has an electrical resistivity of 10,000 Ω·m.
Chemical & Environmental1
Corrosion resistance is excellent (88/100), better than 96% of natural material grades.
Sustainability4
Producing a kilogram of Granite C615 takes about 6 MJ of energy and emits 0.45 kg of CO₂ — less than 78% of natural material grades. Typical recycled content is 0%.
Manufacturability2
Granite C615's machinability is poor (25/100, worse than 96% of natural material grades).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Granite C615
Is Granite easy to machine?
Diamond tooling only — gang/wire saws for blocks, diamond blades, core bits and CNC routers with copious water; avoid dry cutting (silica dust, thermal cracking).
Can Granite be welded?
Not weldable; joints are made with epoxy/polyester stone adhesives, dowels, kerf anchors or mechanical undercut fasteners.
Can Granite be formed, bent or molded?
No plastic forming — shapes are produced by sawing, splitting, flaming, waterjet and profiling; design for compression and avoid thin unsupported tension spans.
What surface finishes work on Granite?
Polished, honed, flamed, bush-hammered, sandblasted or leathered; polished faces benefit from silane/siloxane impregnating sealer, and acidic cleaners must be avoided.
Granite chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiO2mostly as quartz 20–40 % plus feldspar-bound silica | 65 – 77 | 72 |
| Al2O3feldspars and micas | 12 – 16 | 14 |
| K2Oalkali feldspar / biotite | 3 – 6 | 4.5 |
| Na2Oplagioclase | 2.5 – 4.5 | 3.5 |
| CaOplagioclase | 0.5 – 3 | 1.5 |
| Fe2O3+FeObiotite, amphibole, magnetite | 1 – 4 | 2.5 |
| MgO | 0.2 – 1.5 | 0.6 |
| TiO2 | 0.1 – 0.6 | 0.3 |
| other oxides / LOIMnO, P2O5, accessory zircon/apatite, bound water | balance | — |
Granite C615 — frequently asked
What is Granite C615 used for?
Granite C615 is typically used for countertops and vanity tops, building facades and cladding, paving and curbing, monuments and headstones and flooring in high-traffic areas. In short: durable exterior dimension stone; low machinability, diamond only; high compressive strength.
What is the tensile strength of Granite C615?
Granite C615 has a typical tensile strength of 12 MPa (1.74 ksi) — weaker than 68% of natural material grades. Strength varies by condition: see the 3 listed tempers.
Is Granite C615 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 96% of natural material grades). Diamond tooling only — gang/wire saws for blocks, diamond blades, core bits and CNC routers with copious water; avoid dry cutting (silica dust, thermal cracking).
Can Granite C615 be welded?
Not weldable; joints are made with epoxy/polyester stone adhesives, dowels, kerf anchors or mechanical undercut fasteners.
What surface finishes work on Granite C615?
Polished, honed, flamed, bush-hammered, sandblasted or leathered; polished faces benefit from silane/siloxane impregnating sealer, and acidic cleaners must be avoided.
Can Granite C615 be formed, bent or molded?
No plastic forming — shapes are produced by sawing, splitting, flaming, waterjet and profiling; design for compression and avoid thin unsupported tension spans.
What is the maximum service temperature of Granite C615?
Granite C615 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM C615/C615M — Standard Specification for Granite Dimension Stone — ASTM International (2018)
- ASTM C97, C99, C170, C880, C1354 — dimension stone test methods — ASTM International (2018)
- EN 1469 / EN 12372 — Natural stone slabs for cladding and flexural strength — CEN (2015)
- GGG-P-463c / DIN 876 — granite surface plate accuracy grades — US Federal Spec / DIN (1973)
- ASM Engineered Materials Handbook — Ceramics and Glasses (rock property tables) — ASM International (1991)
- Handbook of Physical Properties of Rocks — CRC Press (1982)
- CES/ICE embodied energy and carbon data for quarried dimension stone — Granta / University of Bath (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.