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Avor
Avor (Pterospermum acerifolium)

Family: Sterculiaceae

Common names: Avor, Bon-morla, Ching-pha, Dieng-dit-la-khoh, Dieng-khoh, Dieng-khong-swet, Dieng-myrhaw, Dieng-sla-um-pai, Dieng-tharo-masi, Gaik, Hathipaila, Hatipaile, Hatipeala, Hattipaila, Kanak-champa, Kanakchampa, Karmkara, Karnikar, Kongla-arong, Kuckokunda mus, Kukla, Laider, Laidorbuphang, Larubanda, Lau-gongrai-baphang, Lokong-krong-arong, Lopok-lok-arong, Machkunda, Magwi-napa, Makcand, Mat-bul-japha, Mayeng, Modubura, Moragos, Morra, Mota-marulia, Muckokunda, Mus, Nakhar-theng, Numblong, Numbong, Rangirata, Rikhabok, Sinna, Sipon-asing, Taguru changne, Taung-petwen, Tepop-paplok, Thadaya-maram, Waisil-thing

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

Common uses: Boat building (general), Boxes and crates, Brush backs & handles, Decks, Furniture, Light construction, Matches, Mathematical instruments, Paneling, Plywood, Sporting Goods, Toys, Turnery

Tree size: Trunk diameter is 150-200 cm

Colors: the heart isWhite, Yellowand the sapwoodWhite to yellow, Yellow.The grain isStraight, the textureFine to mediumand the lusterMedium

Natural durability: Perishable, Susceptible to insect attack

Kiln Drying Rate: Naturally dries quickly

Drying Defects: Moderate surface checking, Slight surface checking

Ease of Drying: Rapidly

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Poor to Very Poor

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Fairly Easy to Very Easy, Very Good to Excellent

Planing: Poor to Very Poor

Resistance to Impregnation: Permeable sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Turning: Fairly Difficult to Very Difficult

Polishing: Poor to Very Poor; Staining: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 721 kg/m3
Bending Strength 542 849 kg/cm2
Crushing Strength 212 362 kg/cm2
Hardness kg
Impact Strength 101 cm
Shearing Strength kg/cm2
Stiffness 83 97 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 3 %
Weight 705 560 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 7711 12078 psi
Density 45 lbs/ft3
Impact Strength 40 inches
Maximum Crushing Strength 3027 5157 psi
Stiffness 1188 1383 1000 psi
Weight 44 35 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %

Density (dry weight) = 46-52 lbs/cu. ft.
Density (dry weight) = 38-45 lbs/cu. ft.
Toughness-Hammer drop (Impact Strength) = medium
Shrinkage, Tangential = small
Shrinkage, Radial = small
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = low
Max. crushing strength = medium
Max. crushing strength = low
Bending strength (MOR) = medium
Bending strength (MOR) = low

Chowdhury, K.A., Ghosh, S.S.,1958,Indian Woods: Their identification, properties and uses Vol. I,Dilleruaceae to Elaeocarpaceae,Manager of Publications, Delhi, IndiaDesch, 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.McCann, C.,1947,Trees of India: A Popular Handbook,D.B.Taraporevala Sons & Co. BombayPearson, R.S., Brown, H.P.,1932,Commercial Timbers of India,Govt. Printer Calcutta,2 volsTewari, M.C., Jain, J.C.,1980,Utilization of Secondary Species,Journal of the National Building Organization 25(2) pp1-6Whitmore, T.C.,1973,Tree Flora of Malaya A Manual for Foresters Volume 2,Forest Department Ministry of Primary Industries Malaysia
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