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Boilam
Boilam (Swintonia schwenkii)

Family: Anacardiaceae

Common names: Boilam, Boilsur, Merpauh, Merpauh periang, Pitoh, Sambung, Samginphroo, Selan, Shibika, Thayetkin, Thayetsan

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

Common uses: Heavy construction, Light construction, Matches

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isRed, Redand the sapwoodPaler than heartwood .The grain isStriped figure, the textureMedium to coarseand the lusterPronounced

Natural durability: Susceptible to insect attack, Susceptible to marine borer attack

Kiln Schedules: Drying (speed) is fast

Kiln Drying Rate: Naturally dries slowly

Drying Defects: Slight twist/warp, Splitting

Ease of Drying: Variable

Tree Identification: Bole/stem form is straight

Blunting Effect: Blunting effect on machining is severe

Boring: Difficult

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Easy to Very Easy

Moulding: Very Good to Excellent

Movement in Service: Very Good to Excellent

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

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Moderate working qualities

Sanding: Fairly Easy to Very Easy

Turning: Poor results

Polishing: Very Good to Excellent; Varnishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 753 kg/m3
Bending Strength 504 790 kg/cm2
Crushing Strength 275 449 kg/cm2
Hardness 752 kg
Impact Strength 71 cm
Shearing Strength 123 kg/cm2
Stiffness 117 135 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 2 %
Weight 737 592 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 7178 11247 psi
Density 47 lbs/ft3
Hardness 1658 lbs
Impact Strength 28 inches
Maximum Crushing Strength 3916 6397 psi
Shearing Strength 1763 psi
Stiffness 1665 1923 1000 psi
Weight 46 37 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 4 %

Modulus of Elasticity (stiffness) = medium
Max. crushing strength = medium
Hardness (side grain) = medium
Density (dry weight) = 46-52 lbs/cu. ft.
Bending strength (MOR) = low
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = very low
Shearing strength (parallel to grain) = low
Shearing strength (parallel to grain) = high
Bending strength (MOR) = medium
Modulus of Elasticity (stiffness) = very high

Brown, W.H.,1978,Timbers of the World, No. 4 South East Asia,TRADA, Red Booklet SeriesBurgess, P.F.,1966,Timbers of Sabah,Sabah Forest Record, no.6Gamble, J.S.,1902,A Manual of Indian Timbers,Sampson Low, Marston & Co. LondonLee, Y.H., et al,1974,Commercial Timbers of Peninsular Malaysia,Kuala Lumpur Malaysia Department of Forestry Peninsular Malaysia and,Malaysian Timber Industry BoardLee, Y.H., Lopez, D.T.,1968,The Machining Properties of some Malayan Timbers,Malayan Forester,3,pp194-210Lee, Y.H.,1965,Timber tests - merpauh (Swintonia spp.,Malayan Forester 28(1) pp56-62Menon, P.K.B.,1959,The wood anatomy of Malayan timbers: commercial timbers, 3. Light,hardwoods,Malaysian Forest Research Institute Kepong, Research Pamplet, No. 27.Ng, F.S.P. (Ed,1989,Tree Flora of Malaya A Manual for Foresters Volume 4,Forest Research Institute Malaysia Ministry of Primary IndustriesWyatt-Smith, J.,1979,Pocket Checklist of Timber Trees,Malayan Forest Records No.17
*Come interpretare i dati (manleva su eventuali imprecisioni)