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Post oak
Post oak (Quercus stellata)

Family: Fagaceae

Common names: Cucharillo, Encino, Encino negro, Mamecillo, Oak, Post oak, Roble, Roble amarillo, Roble colorado, Roble encino, Roblecito, White oak

Distributed in: United States (North America)

Distribution overview: This species occurs in New Brunswick, Nova Scotia, Ontario, Prince Edward Island, and Quebec, all in Canada. In the United States, it grows in the states of Alabama, Arkansas, Connecticut, Delaware, Georgia, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, North Carolina, Great Smoky Mountain National Park, Iowa, Illinois, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Virginia, Vermont, Wisconsin, and West Virginia. The species usually forms pure stands and prefers moist, loamy, sandy, rocky, and clay soils. Northern red oak is a popular shade and street tree because of its dense foliage and good form. It is one of the most fast-growing oaks, regenerate easily, can tolerate the climate in cities, and can endure cold weather. Red oak is also planted as an ornamental tree in Great Britain.

Common uses: Cooperages, Core Stock, Crossties, Decorative veneer, Domestic flooring, Factory flooring, Figured veneer, Flooring, Foundation posts, Fuelwood, Mine timbers, Parquet flooring, Pile-driver cushions, Piling, Plain veneer, Poles, Posts, Railroad ties, Stakes, Sub-flooring, Utility poles, Veneer

Product sources: Various species in the white oak group are mixed and marketed together. Supplies are abundant, especially in the form of veneers, at moderate prices.

Environment profile: Rank of relative endangerment based on number of occurences globally.

Tree size: Tree height is 30-40 m

Colors: the heart isRed, Yellowand the sapwoodWidth varies , Yellow.The grain isTypically straight , the textureMedium to coarseand the lusterMedium

Natural durability: Susceptible to insect attack, Very durable

Odor: No specific smell or taste

Kiln Schedules: US=Upland T4-C2/T3-C1

Drying Defects: Splitting, Surface checks

Ease of Drying: Moderately Difficult to Difficult

Blunting Effect: Moderate dulling effect on cutting edges

Boring: Usually very good results

Cutting Resistance: Fairly Difficult to Very Difficult to saw

Gluing: Satisfactory gluing properties

Mortising: Very Good to Excellent

Nailing: Pre-boring recommended

Planing: Very Good to Excellent

Resistance to Abrasion: Highly resistant to wear

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Sanding: Yields clean surfaces

Veneering qualities: Selected white oak logs are converted into veneers. Quartering is reported to produce a flaked figured, while the very popular straight line figure is primarily produced by rift cutting

Steam bending: Highly regarded for steam bending properties

Screwing: Good screwing properties ; Turning: Yields clean surfaces

Polishing: Very Good to Excellent; Staining: Liquid from some finishing products, especially those with high water content such as bleach and water-based stains, react with tannins in white oak to turn the wood green or brown. ;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,59 0,64
Density kg/m3
Bending Strength 558 909 kg/cm2
Crushing Strength 59 98 kg/cm2
Hardness 604 kg
Impact Strength 109 114 cm
Shearing Strength 126 kg/cm2
Stiffness 75 104 1000 kg/cm2
Tangential Shrinkage 9 %
Radial Shrinkage 5 %
Weight 961 689 kg/m3
Maximum Load 0,77 0,91 cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 7938 12936 psi
Crushing Strength 843 1401 psi
Hardness 1333 lbs
Impact Strength 43 45 inches
Maximum Crushing Strength 3410 6468 psi
Shearing Strength 1803 psi
Stiffness 1068 1480 1000 psi
Work to Maximum Load 11 13 inch-lbs/in3
Specific Gravity 0.59 0.64
Weight 60 43 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 9 %
Volumetric Shrinkage 16 %

Low stiffness
Crushing strength = medium
Bending strength (MOR) = medium
Working properties are dictated by the rate of growth of the trees: slow grown trees are generally easier to work with hand and machine tools.

Boone, R.S., C.J. Kozlik, P.J. Bois and E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. United States Department of Agriculture, Forest Service, Forest Products Laboratory, General Technical Report FPL-GTR-57, Madison, Wisconsin.Kaiser, J. 1994. Wood of the Month: Oaks Loom in Designs, Folklore and Symbolism. Wood and Wood Products, November 1994. Page 52.Little, E.L.1980.The Audubon Society Field Guide to North American Trees - Eastern Region.Published by Arthur A. Knopf, New York.Panshin, A.J. and C. deZeeuw. 1980. Textbook of Wood Technology, 4th Edition. McGraw-Hill Series in Forest Resources. McGraw-Hill Book Company, New York.USDA. 1987. Wood Handbook - Wood as an Engineering Material, Forest Service, Agriculture Handbook No. 72, Forest Products Laboratory, Madison, Wisconsin.USDA. 1988. Dry Kiln Operators Manual, Preliminary Copy. Forest Service, Forest Products Laboratory, Madison, Wisconsin.
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