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Cork oak
Cork oak (Quercus cerris)

Family: Fagaceae

Common names: Cork oak, Turkey oak

Common uses: Cabinetmaking, Furniture, Lock gates, Mine timbers, Vehicle parts, Veneer

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isWhite, Yellowand the sapwoodBrown, Red.The grain isStriped figure, the textureCoarse

Natural durability: Durable, Moderately durable

Kiln Schedules: UK=B US=T2C2/T2C1 Fr=2

Drying Defects: Severe cupping, Severe surface checking

Ease of Drying: Slowly

Tree Identification: Bole/stem form is straight

Blunting Effect: High to severe

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Fair to Good , Fairly Easy to Very Easy

Planing: Fairly Easy to Very Easy

Resistance to Impregnation: Sapwood is permeable

Resistance to Splitting: Poor

Response to hand tools: Moderate working qualities

Veneering qualities: Suitable for peeling, Suitable for slicing

Steam bending: Very good

Screwing: Fair to Good Results, Fairly Easy to Very Easy; Turning: Fairly Easy to Very Easy

Painting: Satisfactory; Polishing: Very Good to Excellent; Staining: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 801 kg/m3
Bending Strength 804 1248 kg/cm2
Crushing Strength 380 574 kg/cm2
Hardness kg
Impact Strength 137 cm
Shearing Strength 177 kg/cm2
Stiffness 95 110 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 6 %
Weight 785 641 kg/m3
Maximum Load 1,12 1,47 cm-kg/cm3
Toughness 418 cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 11442 17761 psi
Density 50 lbs/ft3
Impact Strength 54 inches
Maximum Crushing Strength 5408 8171 psi
Shearing Strength 2525 psi
Stiffness 1358 1568 1000 psi
Toughness 363 inch-lbs
Work to Maximum Load 16 21 inch-lbs/in3
Weight 49 40 lbs/ft3
Radial Shrinkage 6 %
Tangential Shrinkage 10 %

Modulus of Elasticity (stiffness) = low
Density (dry weight) = 46-52 lbs/cu. ft.
Density (dry weight) = 53-60 lbs/cu. ft
Work to Maximum Load = high
Max. crushing strength = medium
Max. crushing strength = high
Bending strength (MOR) = medium
Bending strength (MOR) = high
Toughness-Hammer drop (Impact strength) = high
Toughness (total work) = high
Shrinkage, Tangential = large
Shrinkage, Radial = large
Shearing strength (parallel to grain) = medium
Shearing strength (parallel to grain) = high

Brown, W.H.,1978,Timbers of the World, No. 6 Europe,TRADA, Red Booklet SeriesClifford, N.,1957,Timber Identification for the Builder and Architect,Leonard Hill (Books) LTD. LondonFarmer, R.H.,1972,Handbook of Hardwoods,HMSOForest Products Research Laboratory, U.K.,1967,The Steam Bending Properties of various timbers,Forest Products Research Laboratory, Princes Risborough, Leaflet,No.45Forest Products Research Laboratory, U.K.,1969,The Movement of Timbers,Forest Products Research Laboratory, Princes Risborough Technical Note,No.38I.U.F.R.O.,1973,Veneer Species of the World,Assembled at F.P.L. Madison on behalf of I.U.F.R.O. Working Party on,Slicing and Veneer CuttingLavers, G.M.,1983,The Strength Properties of Timber (3rd ed. revised Moore G.L.,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Report (formerly Bulletin No.50)Redding, L.W.,1971,Resistance of Timbers to Impregnation with Creosote,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Bulletin No.54 pp.43Smith, D.N.,1959,The Natural Durability of Timber,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Record,No.30T.R.A.D.A.,1942,Home-grown timber trees - their characteristics, cultivation and Uses,TRADA
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