Cleistanthus indochinensis

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Common products:
- Timber from the heart‑ and sap‑wood is sawn into boards, beams and planks for structural and non‑structural applications.
- Fuelwood and charcoal are produced from the lower‑grade logs and branches; the species is common in rural firewood supply chains.

Industrial and craft applications:
- The lumber is used in light‑frame construction, interior framing, and general carpentry, as well as in the production of furniture, cabinetry and joinery.
- It is also processed into veneer and plywood for panel‑board manufacturing, where its moderate density and good glue‑bonding characteristics are valued.

Wood and fiber:
- Only the wood is utilized; the bark, leaves and roots are not reported for industrial use.
- Sawn timber is supplied in standard dimensions (e.g., 2 × 4 in, 38 × 89 mm) and is often marketed as “Cleistanthus timber” in local markets.

Properties relevant to use:
- Density: ≈ 0.55–0.65 g cm⁻³ (moderately high for a tropical hardwood).
- Strength: sufficient compressive and bending strength for light structural purposes; typical modulus of rupture values are in the range of 70–110 MPa.
- Shrinkage: low to moderate radial and tangential shrinkage (≈ 3–5 % and 5–7 % respectively), limiting dimensional change after drying.
- Durability: the wood contains a lignin‑rich matrix that confers natural resistance to decay and insect attack, allowing untreated use in exterior applications.

Sustainability and sourcing:
- Cleistanthus indochinensis occurs naturally in secondary and logged‑over forests of Vietnam, Cambodia, Laos and parts of Thailand.
- It regenerates quickly after disturbance and is listed in regional timber inventories, which facilitates controlled harvesting.
- Extraction follows national forest‑management legislation (e.g., Vietnam’s Forestry Law 2017) and is subject to sustainable‑forest‑practice guidelines promoted by regional timber‑trade associations.
- The species contributes to carbon sequestration; mature trees store an estimated 150–200 kg C m⁻³ of biomass, supporting climate‑mitigation objectives in the countries where it is harvested.

Standards and regulation:
- The lumber conforms to regional grading standards such as EN 13556 (Wood – Classification and nomenclature) and meets the structural‑grade requirements of national building codes in the Indochinese region.

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