Alstonia angustiloba

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Common products:
Natural rubber latex (jelutong) is harvested by tapping and coagulated to produce raw rubber crumb used as a general-purpose elastomer; the butter or “latex serum” is employed as a film-forming binder and adhesive in various industrial systems (PROSEA; Wycherley 1959; Perkin 1920). The lightweight sapwood is converted into lumber used in light carpentry, construction, and packaging; veneer and plywood are produced for core and face plies in composite panels (PROSEA; Lim & Gan 2002; ITTO).

Industrial and craft applications:
Latex from Alstonia angustiloba is reported among jelutong resources used for non-dermatological adhesives, coating binders, and as a generic raw rubber component (Wycherley 1959; Perkin 1920). The wood is suitable for masts, poles, light joinery, match boxes, pencils, moldings, and turnery; it is also suitable for paper pulping as a pulpable hardwood and may be used for particleboard or blockboard where low density and easy machining are advantageous (ITTO; PROSEA; Heyne 1950).

Food and beverages (non-medicinal):
None documented for this species. Sources emphasize industrial applications of jelutong latex and its use as a rubber raw material rather than food uses.

Colorants and tanning:
No colorants or tanning agents are specifically attributed to A. angustiloba. Swietenia macrophylla (mahogany) bark has been reported for red dyes in the Malay Peninsula; this use does not apply here (Burkill).

Wood and fiber:
The wood is light to very light (commonly 320–400 kg/m³ air-dry), soft, straight- to interlocked-grained, and machines easily with good planing and turning properties; heartwood is not distinct from sapwood, and the species is non-durable (Lim & Gan 2002; ITTO). Timber is classified as jelutong in the trade and utilized for light structural uses, masts, poles, joinery, furniture, and as core stock in plywood; it is also used for pencils and match boxes (PROSEA; Lim & Gan 2002; ITTO).

Fragrance and cosmetics:
No documented fragrance or cosmetic uses specifically attributable to A. angustiloba are available.

Properties relevant to use:
Latex composition includes polyterpenoid resins (e.g., lupeol, betuline) and hydrocarbon fractions typical of jelutong resins, supporting its adhesive and film-forming behavior (Ohler; Perkin 1920). Wood characteristics include low density, low to moderate shrinkage, easy machining, and ready gluability, enabling conversion into lumber, veneer, plywood, particleboard, pulp, and small turned items (Lim & Gan 2002; ITTO).

Standards and regulation:
Exported jelutong timber is commonly graded under Malaysian and Singaporean standards for hardwood logs and sawn timber; exact standards vary by origin (ITTO; local grading rules). Trade listings may categorize “jelutong” by species association in regional timber nomenclature (ITTO).

Sustainability and sourcing:
Alstonia angustiloba occurs in lowland and swamp forests of Peninsular Malaysia, Borneo, and parts of Sumatra; selective logging has historically supplied jelutong. The species is categorized as non-durable and commonly harvested under the jelutong commodity; resource assessments and trade data reflect supply-demand imbalance (PROSEA; ITTO).

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