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Rengas
Rengas (Melanorrhoea spp.)

Family: Anacardiaceae

Common names: Black varnish tree, Borneo rosewood, Gluta, Hekakoro, Lingas, Rak, Rengas, Straights mahogany, Thayet thitsi, Thitsi

Distributed in: Cambodia, China, India, Indonesia, Laos, Malaysia, Myanmar, Philippines, Thailand, Vietnam (Oceania and S.E. Asia)

Distribution overview: Indo-Malaysian region, extending into Indonesia and the Philippines.

Common uses: Boat building, Building materials, Canoes, Carvings, Chairs, Chests, Concealed parts (Furniture), Core Stock, Decorative veneer, Desks, Dining-room furniture, Dowell pins, Dowells, Drawer sides, Excelsior, Figured veneer, Fine furniture, Floor lamps, Furniture , Furniture components, Furniture squares or stock, Hatracks, Interior construction, Interior trim, Joinery, Kitchen cabinets, Lifeboats, Living-room suites, Millwork, Moldings, Office furniture, Paneling , Plain veneer, Radio - stereo - TV cabinets, Rustic furniture, Shipbuilding, Stools, Tables , Trimming, Turnery, Veneer

Product sources: Several species in the Melanorrhoea and Gluta genera are mixed and marketed together under the trade name Rengas.

Environment profile: Data source is World Conservation Monitoring Center

Colors: the heart isRed - bright , Yellowand the sapwoodWhite, Whitish.The grain isStraight to irregular, the textureResinous and oilyand the lusterSlightly lustrous

Natural durability: The standing tree is susceptible to Ambrosia Beetle attack, Very durable

Odor: No specific smell or taste

Silica Content: Siliceous

Drying Defects: Slight surface checking, Slight twist/warp

Ease of Drying: Thick Stock Requires Care

Blunting Effect: Severe and rapid due to silica

Boring: Fairly difficult to very difficult

Carving: Fairly Difficult to Very Difficult

Cutting Resistance: Much easier to cut in green condition

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Difficult to Very Difficult

Moulding: Fairly Difficult to Very Difficult

Movement in Service: Fairly Difficult to Very Difficult

Nailing: Fairly Difficult to Very Difficult, Pre-Boring Recommended

Planing: Planes well, to a good finish

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Yields a smooth, clean finish

Routing recessing: Fairly Difficult to Very Difficult

Steam bending: Excessive resin exudation makes steam bending impossible

Screwing: Fairly Difficult to Very Difficult, Pre-boring recommended; Turning: Fairly Difficult to Very Difficult

Polishing: Requires a filler;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,58 0,75
Density 737 kg/m3
Bending Strength 814 1110 kg/cm2
Crushing Strength 53 76 kg/cm2
Hardness 617 kg
Impact Strength 63 83 cm
Shearing Strength 132 kg/cm2
Stiffness 139 149 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 3 %
Weight 785 641 kg/m3
Maximum Load 0,63 0,98 cm-kg/cm3
Toughness cm-kg
Static Bending 543 645 kg/cm2
Item Green Dry English
Bending Strength 11582 15800 psi
Crushing Strength 759 1092 psi
Density 46 lbs/ft3
Hardness 1362 lbs
Impact Strength 25 33 inches
Maximum Crushing Strength 5898 8452 psi
Shearing Strength 1882 psi
Static Bending 7737 9186 psi
Stiffness 1989 2126 1000 psi
Work to Maximum Load 9 14 inch-lbs/in3
Specific Gravity 0.58 0.75
Weight 49 40. lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 5 %

Toughness-Hammer drop (Impact Strength) = very low
Resists denting and marring
Modulus of Elasticity (stiffness) = very low
Heavy
Hardness (side grain) = medium
Density = high
Bending strength (MOR) = low

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Desch, H. E. 1957. Manual of Malayan Timbers - Volume I. Malayan Forest Records, No. 15. Malaya Publishing House Ltd., Singapore.Desch, H. E. 1957. Manual of Malayan Timbers. Malayan Forest Records, 28(30):315-318.Keating, W.G., Bolza, E.,1982,Characteristics properties and uses of timbers. South East Asia, Northern,Australia and the Pacific,C.S.I.R.O. Div. Chemical Technology,Inkata Press,1Kloot, N. H. and E. Bolza.1961.Properties of Timbers Imported into Australia.Technological Paper No. 12.Division of Forest Products, Commonwealth Scientific & Industrial Research Organization, Melbourne, Australia.Limaye, V.D.1954. Grouping of Indian Timbers and their Properties, Uses and Suitability. Indian Forest Records, New Series. Timber Mechanics, Vol. 1, No. 2, Forest Research Institute, Dehra Dun, India.Limaye, V.D. and B.R. Sen. 1953. Weights and Specific Gravities of Indian Woods. Indian Forest Records, New Series. Timber Mechanics, Vol. 1, No. 4, Forest Research Institute, Dehra Dun, India.Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.WCMC. 1992. Conservation Status Listing - Trees and Timbers of the World. World Conservation Monitoring Center-Plants Programme, Cambridge, CB3 ODL, United Kingdom.
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