Ash · finish state
Ash-GRN
Properties of the GRN condition, compared with the other Ash tempers.
Pick for steam bending, turning blanks and riven handle stock that will be dried after shaping.
What is Ash-GRN?
Ash-GRN is Ash supplied in the GRN condition — pick for steam bending, turning blanks and riven handle stock that will be dried after shaping. Ash-GRN has a tensile strength of 75 MPa (10.9 ksi), stronger than 70% of natural material grades. Elongation at break is 1% and the elastic modulus is 9.9 GPa (1.44 Msi). Ash-GRN has a density of 0.87 g/cm³ (0.0314 lb/in³), heavier than 70% of natural material grades. KD12 is the default condition FabDigit quotes; GRN is available on request or by drawing note.
Advantages
- Conducts heat well — 0.28 W/m·K (0.162 BTU/hr·ft·°F), better than 81% of natural material grades
Limitations
- Needs corrosion protection — 20/100, worse than 98% of natural material grades
- Limited service temperature — 60°C (140 °F), worse than 94% of natural material grades
- Difficult to machine — 55/100, worse than 91% of natural material grades
Ash-GRN properties
Typical room-temperature values for Ash-GRN — 11 properties are specific to this condition; the rest are grade-level values shared by every Ash temper. Each bar shows where the value sits among the natural material grades in FabDigit's library — further right is higher.
Physical2
Ash-GRN has a density of 0.87 g/cm³ (0.0314 lb/in³), heavier than 70% of natural material grades.
Mechanical9
Ash-GRN has a tensile strength of 75 MPa (10.9 ksi), stronger than 70% of natural material grades. Elongation at break is 1% and the elastic modulus is 9.9 GPa (1.44 Msi).
Thermal5
Ash-GRN is rated for continuous service to 60°C (140 °F). It conducts heat at 0.28 W/m·K (0.162 BTU/hr·ft·°F), better than 81% of natural material grades. Thermal expansion is 30 µm/m·K (16.7 µin/in·°F).
Electrical2
Ash-GRN is an electrical insulator with a dielectric strength of 3 kV/mm (76.2 V/mil) and a resistivity of 100 Ω·m.
Chemical & Environmental1
Corrosion resistance is poor (20/100), worse than 98% of natural material grades.
Sustainability4
Producing a kilogram of Ash-GRN takes about 11 MJ of energy and emits 0.5 kg of CO₂ — more than 56% of natural material grades. Typical recycled content is 5%.
Manufacturability2
Ash-GRN's machinability is good (55/100, worse than 91% of natural material grades).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Ash tempers and conditions
Ash is also supplied in 3 other conditions. The full side-by-side table is on the Ash overview.
- KD12DefaultDefault commercial condition for indoor furniture, flooring, tool handles and sports goods.110 MPa tensile
- GRNPick for steam bending, turning blanks and riven handle stock that will be dried after shaping.75 MPa tensile
- ADChoose for sheltered outdoor joinery or shop stock that will be re-conditioned before final machining.8 properties
- TMTPick for cladding, decking and sauna parts where dimensional stability and decay resistance matter more than toughness.12 properties
Working with Ash-GRN
Is Ash easy to machine?
Saws, planes and turns cleanly with carbide tooling; moderate tool blunting and a tendency to tear-out at interlocked grain, so use sharp knives and light finishing cuts.
Can Ash be welded?
Not weldable — joined by PVAc/PU/epoxy adhesives (glues well) or mechanical fasteners; pre-drill near ends to avoid splitting.
Can Ash be formed, bent or molded?
One of the best steam-bending hardwoods: steam green or air-dried stock ~1 h per 25 mm and bend over a strap to tight radii.
What surface finishes work on Ash?
Coarse open pores need grain filler for a mirror finish; stains, oils and waterborne lacquers take evenly, and exterior use requires preservative or thermal modification plus UV-stable coating.
Ash 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 |
|---|---|---|
| celluloseoven-dry basis | 40 – 47 | 44 |
| hemicellulosexylan-rich, typical of hardwoods | 22 – 30 | 26 |
| ligninsyringyl/guaiacyl type | 21 – 28 | 25 |
| extractivestannins, fats, sugars; higher in heartwood | 2 – 6 | 4 |
| mineral ashCa, K dominated | 0.2 – 1 | 0.6 |
| moisture (as supplied, KD)added on top of oven-dry substance | 8 – 14 | 12 |
Ash-GRN — frequently asked
What is Ash-GRN used for?
Ash-GRN is typically used for tool handles, baseball bats, hockey sticks, furniture and interior trim. In short: highest shock resistance here; excellent steam-bending hardwood; open-pore surface needs filler.
What is the tensile strength of Ash-GRN?
Ash-GRN has a typical tensile strength of 75 MPa (10.9 ksi) — stronger than 70% of natural material grades. Strength varies by condition: see the 4 listed tempers.
Is Ash-GRN easy to machine?
Reasonably — machinability is rated good (55/100, worse than 91% of natural material grades). Saws, planes and turns cleanly with carbide tooling; moderate tool blunting and a tendency to tear-out at interlocked grain, so use sharp knives and light finishing cuts.
Can Ash-GRN be welded?
Not weldable — joined by PVAc/PU/epoxy adhesives (glues well) or mechanical fasteners; pre-drill near ends to avoid splitting.
What surface finishes work on Ash-GRN?
Coarse open pores need grain filler for a mirror finish; stains, oils and waterborne lacquers take evenly, and exterior use requires preservative or thermal modification plus UV-stable coating.
Can Ash-GRN be formed, bent or molded?
One of the best steam-bending hardwoods: steam green or air-dried stock ~1 h per 25 mm and bend over a strap to tight radii.
What is the maximum service temperature of Ash-GRN?
Ash-GRN is rated for continuous use to about 60°C (140 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Wood Handbook — Wood as an Engineering Material (FPL-GTR-190), mechanical properties of white/green ash — USDA Forest Products Laboratory (2021)
- EN 13556 — Round and sawn timber: nomenclature of timbers used in Europe (FRAX) — CEN (2003)
- EN 350 — Durability of wood and wood-based products, natural durability classes — CEN (2016)
- The Wood Database — Fraxinus excelsior / Fraxinus americana species data — wood-database (2023)
- Thermally modified ash cladding technical data (Thermory/ThermoWood class D) — International ThermoWood Association (2022)
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.