Hard Maple GREEN
Print state
GREEN = freshly sawn, MC above fibre saturation
Pick for steam-bending, wet turning or when the part will be dried after shaping; strength is roughly half of dry.
Values for the GREEN condition
Other Hard Maple tempers and conditions
Hard Maple is listed in 3 conditions; see the grade overview at Hard Maple.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GREENThis page Freshly sawn, MC above fibre saturation | Pick for steam-bending, wet turning or when the part will be dried after shaping; strength is roughly half of dry. | — | 70 | 2 | — | 0.3 W/m·K |
KD12Default Kiln-dried / air-dried to 12 % MC | Default engineering condition: lumber equilibrated near 12 % MC, matching all published design and clear-wood strength tables. | — | 108 | 1.5 | — | 0.16 W/m·K |
Kiln-dried to 6–8 % MC | Pick for glued-up worktops, butcher blocks, flooring and machine jigs in heated indoor service where movement must be minimal. | — | 115 | 1.3 | — | 0.15 W/m·K |
What is Hard Maple GREEN?
Hard Maple GREEN is Hard Maple in the GREEN condition — pick for steam-bending, wet turning or when the part will be dried after shaping; strength is roughly half of dry. Hard Maple GREEN has a tensile strength of 70 MPa (10.2 ksi), stronger than 67% of natural material grades. Elongation at break is 2% and the elastic modulus is 10.7 GPa (1.55 Msi). Hard Maple GREEN has a density of 0.92 g/cm³ (0.0332 lb/in³), heavier than 74% of natural material grades. KD12 is the default condition FabDigit quotes; GREEN is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 87% of natural material grades
- Conducts heat well — 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 81% of natural material grades
- Ductile — tolerates forming and impact — 2%, better than 77% of natural material grades
Limitations
- Needs corrosion protection — 15/100, worse than 100% of natural material grades
- Difficult to machine — 55/100, worse than 91% of natural material grades
Hard Maple GREEN properties
Typical room-temperature values for Hard Maple GREEN; 11 are specific to this condition. Other listed values are Hard Maple reference data and may not represent this condition. Bars are the position among natural material grades.
Physical2
Hard Maple GREEN has a density of 0.92 g/cm³ (0.0332 lb/in³), heavier than 74% of natural material grades.
Mechanical9
Hard Maple GREEN has a tensile strength of 70 MPa (10.2 ksi), stronger than 67% of natural material grades. Elongation at break is 2% and the elastic modulus is 10.7 GPa (1.55 Msi).
Thermal5
Hard Maple GREEN is rated for continuous service to 90°C (194 °F). It conducts heat at 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 81% of natural material grades. Thermal expansion is 4.5 µm/m·K (2.5 µin/in·°F).
Electrical1
Hard Maple GREEN has an electrical resistivity of 10,000 Ω·m.
Chemical & Environmental1
Corrosion resistance is poor (15/100), worse than 100% of natural material grades.
Sustainability4
Producing a kilogram of Hard Maple GREEN takes about 12 MJ of energy and emits 0.55 kg of CO₂ — more than 69% of natural material grades. Typical recycled content is 0%.
Manufacturability2
Hard Maple GREEN's machinability is good (55/100, worse than 91% of natural material grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hard Maple GREEN
Is Hard Maple easy to machine?
Cuts cleanly with carbide at moderate feed rates but burns easily on stationary cuts and dulls HSS quickly — use sharp tooling, climb-limited feeds and good chip evacuation.
Can Hard Maple be welded?
Not weldable; joined by PVAc/PU/epoxy adhesives or mechanical fasteners — pre-drill for screws to avoid splitting.
Can Hard Maple be formed, bent or molded?
Bends fairly well when steamed or after ammonia/hot-water plasticising at green to 20 % MC; account for ~9–10 % tangential and ~5 % radial shrinkage when drying.
What surface finishes work on Hard Maple?
Fine closed grain sands to a very smooth surface and takes clear lacquer, oil-wax or hardwax well; it blotches with pigmented stains, so use a washcoat or dye, and keep out of persistently damp service.
Hard Maple 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 | 42 – 48 | 45 |
| hemicellulosemainly glucuronoxylan | 25 – 33 | 30 |
| ligninsyringyl-rich hardwood lignin | 20 – 25 | 22 |
| extractivessugars, phenolics — low decay resistance | 1 – 4 | 2.5 |
| ash | 0.2 – 0.5 | 0.3 |
| moistureservice MC; reference tables at 12 % | ≥ 6 (balance) | — |
Hard Maple GREEN — frequently asked
What is Hard Maple GREEN used for?
Hard Maple GREEN is typically used for flooring, cutting boards, furniture, musical instruments and bowling lanes. In short: most wear-resistant domestic hardwood; closed grain, very smooth finish; low decay resistance when damp.
What is the tensile strength of Hard Maple GREEN?
Hard Maple GREEN has a typical tensile strength of 70 MPa (10.2 ksi) — stronger than 67% of natural material grades. Strength varies by condition: see the 3 listed tempers.
Is Hard Maple GREEN easy to machine?
Reasonably — machinability is rated good (55/100, worse than 91% of natural material grades). Cuts cleanly with carbide at moderate feed rates but burns easily on stationary cuts and dulls HSS quickly — use sharp tooling, climb-limited feeds and good chip evacuation.
Can Hard Maple GREEN be welded?
Not weldable; joined by PVAc/PU/epoxy adhesives or mechanical fasteners — pre-drill for screws to avoid splitting.
What surface finishes work on Hard Maple GREEN?
Fine closed grain sands to a very smooth surface and takes clear lacquer, oil-wax or hardwax well; it blotches with pigmented stains, so use a washcoat or dye, and keep out of persistently damp service.
Can Hard Maple GREEN be formed, bent or molded?
Bends fairly well when steamed or after ammonia/hot-water plasticising at green to 20 % MC; account for ~9–10 % tangential and ~5 % radial shrinkage when drying.
What is the maximum service temperature of Hard Maple GREEN?
Hard Maple GREEN is rated for continuous use to about 90°C (194 °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-282, Ch. 5 Mechanical Properties — USDA Forest Service, Forest Products Laboratory (2021)
- ASTM D143 — Standard Test Methods for Small Clear Specimens of Timber — ASTM International (2022)
- ASTM D2555 — Establishing Clear Wood Strength Values — ASTM International (2017)
- NHLA Rules for the Measurement and Inspection of Hardwood and Cypress — National Hardwood Lumber Association (2023)
- CES EduPack / ICE embodied-energy data for kiln-dried hardwood — Granta Design / 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.