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Achung
Achung (Duabanga grandiflora)

Family: Sonneratiaceae

Common names: Achung, Baichua, Bandarhulla, Banderhola, Banderkanda, Bandorhulla, Berembang bukit, Bolchim, Bonderkella, Door, Jarul-jhalna, Kalam, Kamaung-yegyi, Kaungglaung, Khoken, Kochan, Kokan, Laklob, Lampati, Lampatia, Lepcha, Linkwai, Linzin, Ma-u, Ma-u-lettan, Mai-ka-yong, Mai-sa-lao-long, Mau-lettanshe, Myaukngo, Myaukugo, Pedada bukit, Phay, Ramdala, Shala, Tadet-ko, Tadetti, Thitazaw, Thitkazaw

Distributed in: Burma, India, Malaysia, Philippines (Oceania and S.E. Asia)

Common uses: Agricultural implements, Boat building (general), Boxes and crates, Canoes, Chairs, Concrete formwork, Furniture, Heavy construction, Joinery, Light construction, Millwork, Paneling, Plywood, Pulp/Paper products, Tables, Veneer: decorative

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isWhite to cream, Yellow to golden-yellow to orangeand the sapwoodWhite, Yellow.The grain isWavy, the textureMedium coarse to coarseand the lusterMedium

Natural durability: Susceptible to attack from powder post (Lyctid & Bostrychid) beetles, Susceptible to insect attack

Kiln Schedules: UK=A US=T2D4/T2D3 Fr=1

Kiln Drying Rate: Rapid (<10 days for boards < 32 mm, to <30 days for boards >= 63 mm)

Drying Defects: Slight surface checking, Slight twist/warp

Ease of Drying: Fairly Easy

Comments: General finishing qualities are rated as good General finishing qualities are rated as poor

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Veneering qualities: Veneers easily, Veneers moderately easy

Turning: Very Good to Excellent Results

Polishing: Satisfactory; Staining: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 480 kg/m3
Bending Strength 452 709 kg/cm2
Crushing Strength 237 397 kg/cm2
Hardness 246 kg
Impact Strength 55 cm
Shearing Strength 73 kg/cm2
Stiffness 81 94 1000 kg/cm2
Tangential Shrinkage 6 %
Radial Shrinkage 3 %
Weight 464 400 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 6432 10087 psi
Density 30 lbs/ft3
Hardness 544 lbs
Impact Strength 22 inches
Maximum Crushing Strength 3383 5653 psi
Shearing Strength 1052 psi
Stiffness 1153 1346 1000 psi
Weight 29 25 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 8 %

Bending strength (MOR) = low 0
Max. crushing strength = medium
Modulus of Elasticity (stiffness) = very low
Hardness (side grain) = very soft
Shrinkage, Radial = small
Modulus of Elasticity (stiffness) = low
Shrinkage, Tangential = small
Shearing strength (parallel to grain) = very low
Max. crushing strength = low
Hardness (side grain) = soft
Density (dry weight) = 31-37 lbs/cu. ft.
Toughness-Hammer drop (Impact Strength) = very low
Toughness-Hammer drop (Impact Strength) = low
Shrinkage, Volumetric = small
Shrinkage, Tangential = very small
Shrinkage, Tangential = moderate
Shrinkage, Tangential = large
Shrinkage, Radial = very small
Shrinkage, Radial = large
Shearing strength (parallel to grain) = low
Density (dry weight) = 23-30 lbs/cu. ft.
Bending strength (MOR) = medium

Barber, H.,1940,Air drying tests on Burma timbers,Burma Government Printing and Stationary, Forest Bulletin,No.33 (Economic,Series,No.8)Bhat, R.V.,1970,Pulping of Tropical Hardwoods,Indian Pulp and Paper Technology Association IPPTA,7(3,pp203-214Burgess, P.F.,1966,Timbers of Sabah,Sabah Forest Record, no.6Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Desch, H.E.,1954,Manual of Malayan Timbers (2 vols,Malayan Forest Records,no.15Gamble, J.S.,1902,A Manual of Indian Timbers,Sampson Low, Marston & Co. LondonHoward, A.L.,1948,A Manual of Timbers of the World.,Macmillan & Co. Ltd. London 3rd ed.Limaye, V.D.,1933,The Physical and Mechanical Properties of woods grown in India (Third,Interim Report on Project 1,Indian Forest Records,18(10,pp1-70Pearson, R.S., Brown, H.P.,1932,Commercial Timbers of India,Govt. Printer Calcutta,2 volsPearson, R.S.,1917,Note on Kakan or Lamptia Timber. Duabanga sonneratiendes Ham,Indian Forest Bulletin,No.36Purkayastha, S.K.,1982,Indian woods: Their identifications, properties and uses, Vol. IV,Myrlacene to Symploceae,Controller of Publications, New DelhiSekhar, A.C.,1967,Some Indian Timbers Equivalent to Foreign Timbers,Van Vigyan 5(1&2,pp18-24Sono, P.,1974,Merchantable Timbers of Thailand.,Forest Products Research Division, Royal Forest Department, Bangkok,,Thailand.Tewari, M.C., Jain, J.C.,1980,Utilization of Secondary Species,Journal of the National Building Organization 25(2) pp1-6Tropical Timber Information Centre,1975,Duabanga spp. (Sonneratiacene,State University, New York TTIC Brief No.27Whitmore, T.C. (Ed.,1972,Tree Flora of Malaya A Manual for Foresters Volume 1,Forest Department Ministry of Agriculture and Lands Malaysia
*Come interpretare i dati (manleva su eventuali imprecisioni)