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RESAK (Vatica rassak)
Trade Name
Resak
Scientific Name
Vatica rassak (Korth.) Blume
Family
Dipterocarpaceae
Common Names
Tawi-tawi narig (Philippines); Resak ayer (Malaysia); Resak danau (Malaysia); Resak irian (Malaysia); Damar dereh (Indonesia); Damar hiru (Indonesia); Resak (United Kingdom); Resak (Spain); Resak (Italy); Resak (Sweden); Resak (Netherlands); Resak (Germany); Narig (Philippines); Resak (United States of America); Resak (France); Punchan (Thailand); Kitenjo (Indonesia); Rahuk tebung (Borneo); Resek (Borneo); Songa (Sumatra); Chramas (Cambodia); Lau-tau (Vietnam); Resak (Indonesia)
Scientific Name Synonyms
Vatica papuana Dyer; Vatica moluccana Burck; Vatica celebensis Brandis
Description Of The Tree
Botanical Description
It is a medium-sized to fairly large tree, up to 40 m tall with straight bole branchless for up to 22 m and up to 50 cm in diameter, fluted at the base, with low or without buttresses.
Natural Habitat
Vatica rassak is found on riverbanks and dry ridges up to 500 m of altitude.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels exclusively solitary (over 90%). Vestured pits. Vessels per mm2 more than 20 (very abundant). Intervessel pits scalariform. Vascular/vasicentric tracheides present. Simple perforation plates. Multiple perforation plates. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Axial parenchyma confluent unilateral paratracheal. Sheath cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Fibers with distinctly bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is reddish-brown to brown with a green tinge, darkening on exposure to dark reddish-brown. The sapwood is light yellowish-brown, clearly differentiated in fresh logs, but less sharply defined when dry.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
The grain is straight or only slightly interlocked.
Texture
The texture is fine and even.
Natural Durability
The wood has a average service life in contact with the ground of only 2 years. It is not resistant neither against marine borers, nor to pin hole borers.
Natural durability index (1= Very high durability, 7=Vey low durability)
5
Silica Content
Silica Content: It is reported to contain 0.1% silica. Silica Value: 0.1
Resistance To Impregnation
It is difficult to impregnate.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.63
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.70
Total shrinkage Tangential (Saturated to 0%MC) (%)
5.0
Total shrinkage Radial (Saturated to 0%MC) (%)
3.3
Drying Defects
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of checks. Kiln Schedules: Schedule proposed as a reference by comparison with well known species taking into account to the general technological behavior of this species.
Recommended Dry Kiln Schedule
UK-B; US-14-15
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.5
Wood Chemical Properties
Wood Mechanical Properties
Compression parallel to fiber 12%MC (kgf/cm²)
1500
Workability
Sawing
It is rather difficult to saw because of the presence of a large amounts of gummy resin that may clog the saw-teeth.
Rotary Veneer Cutting
In general, the wood is hard to peel but it has been reported as being suitable for sliced veneer.
Sliced Veneer
In general, the wood is hard to peel but it has been reported as being suitable for sliced veneer.
Planing
The presence of resins in wood interferes with the planing operations.
Turning
30
Boring
Boring is reported to be easy.
Finishing
Finishing behavior is good to fair.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, beams, boards, flooring, frames, FURNITURE AND CABINETS, PLYWOOD AND VENEER, TURNING, PACKING, NAVAL CONSTRUCTION
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Flooring
- 14 - Handbook of Hardwoods
Frames
- 16 - Woods of the World
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Turning
- 30 - Embassy of Honduras in Japan
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
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