Properties and grades

The proposed classification is a guide only. Companies offer other categories, different widths and special finishes such as oil. It is recommended to visit the websites of member companies to see the wider range of products available.

 

Standard dimensions available

Dimensions Unfinished Prefinished
Thickness in. (mm) 25/32″ (19,8 mm)
33/32″ (26,2 mm)
3/4″ (19 mm)
Width in. (mm) 1 ½” (38,10 mm)
1 ¾” (44,45 mm)
2″ (50,80 mm)
2 ¼” (57,15 mm)
2 ½” (63,50 mm)
3 ¼” (82,55 mm)
2 ¼” (57,15 mm)
2 ½” (63,50 mm)
3 ¼” (82,55 mm)

Standard industry grade

Unfinished Prefinished
Clear Select & better
Select & better
#1 Common #1 Common
#2 Common

Types of finish available

High Gloss Semi-Gloss Matte
> 75% gloss 50 to 75% gloss < 50% gloss

Specifications

Clear Select & better #1 Common #2 Common
  • Best appearance.
  • Selected for uniformity of light color.
  • Slight variation in the natural sapwood color (sticker stain is not considered a defect).
  • Limited small character marks.
  • Pin knots allowed.
  • Mineral streaks of less than 1/8″ x 1″ (3 x 25 mm).
  • No checks or splits.
  • Minimum length: 12″ (30 cm).

 

  • Combination of clear and select grades.
  • The most standard high grade hardwood flooring sold on the world market.
  • Excellent appearance.
  • Variation in the natural sapwood color (sticker stain is not considered a defect).
  • Limited character marks.
  • Sound knots of less than 1/8″ x 4″ (3 x 100 mm).
  • No stains, checks, or splits.
  • Minimum length: 12″ (30 cm).
  • Variegated appearance.
  • All color variations allowed.
  • Sound knots less than 3/8″ (10 mm), flags, worm holes, and mineral streaks allowed.
  • No splits, holes, or voids.
  • Minimum length: 10″ (25 cm).
  • Rustic appearance.
  • All color variations allowed.
  • All characteristics of the species allowed.
  • A serviceable floor after knot holes, worm holes, checks, splits, and other imperfections are filled and finished.
  • Minimum length: 10″ (25 cm)
Standard grading allowance: maximum of 5% below the actual grade. Also available in combination of grades.

Physical Properties

Hard Maple Yellow Birch Red Oak White Ash Beech Cherry Walnut
Density / nominal (kg/m3) 659 608 612 613 667 551 594
Hardness (N) 7,290 5,930 6,170 7,050 6,490 4,630 5,910
Bending Strenght (MP) 115 106 98.7 108 116 87.1 103
Stiffness (MP) 14,100 14,100 11,00 12,800 14,000 11,900 13,100

Working Properties

Hard Maple Yellow Birch Red Oak White Ash Beech Cherry Walnut
Machinability Excellent Excellent Excellent Very Good Good Excellent Good
Stability Good Good Very Good Very Good Good Good Excellent
Gluing Good Good Good Good Very Good Very Good Excellent
Sandability Very Good Good Good Fair Very Good Excellent Very Good
Nailability Good Good Excellent Good Fair Fair Fair
Paintability Good Good Good Excellent Good Good Good
Stainability Good Very Good Good Good Good Very Good Good