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Home > Quality Standards > Solid Wood Flooring

Oak/Ash | Maple/Birch/Beech | Kempas/Merbau/Walnut | Bamboo

[G] look up term in glossary.

Oak/Ash
Defects	Top Face			Back Face
Defects	Grade A	Grade B	Grade C	Back Face
Live knot [G]	2 allowed, diameter ≤ 5 mm;plank length ≤ 500 mm	2 allowed, every 500 mm of plank's length;5 mm ≤ diameter ≤ 20 mm	Not restricted as long as diameter ≤ 20 mm	Not restricted in size or number
Dead knot [G]	Not allowed	1 allowed, every 500 mm of plank's length; diameter ≤ 4 mm	5 allowed, diameter ≤ 10 mm	Not restricted as long as diameter ≤ 20 mm
Wormholes [G]	Not allowed	Not allowed	5 allowed, diameter ≤ 2 mm (mending)	Not restricted as long as diameter ≤ 15 mm
Brown line [G]	Not allowed	Not restricted	Not restricted	Not restricted
Sapwood [G]	Not allowed	<10% of plank's area	Not restricted	Not restricted
Rot [G]	Not allowed	Not allowed	Not allowed	Area of initial rot ≤ 20%
Wane [G]	Not allowed	Not allowed	Not allowed	Length ≤ 30% of plank's length; Width ≤ 20% of plank's width
Crack [G]	Not allowed	Not allowed	2 allowed, width ≤ 0.1 mm; length ≤ 15 mm	Not restricted in number; width ≤ 0.5 mm; length ≤ 50 mm
Cut and chatter mark [G]	Not allowed	Not allowed	Not distinct	Not restricted
Indentation	Not allowed	Slight	Slight	Not restricted
Scratches on varnish	Not allowed	Slight	Slight	Not restricted
Blister [G]	Not allowed	Not allowed	Not allowed	Not restricted
Exposed undercoat [G]	Not allowed	Not allowed	Not allowed	Not restricted
Pin holes	Not allowed	3 allowed, diameter ≤ 0.5 mm	3 allowed, diameter ≤ 0.5 mm	Not restricted
Wrinkling [G]	Not allowed	Not allowed	< 5% of plank's area	Not restricted
Nib [G]	2 allowed, length ≤ 500 mm;5 allowed, length > 500 mm	4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm	4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm	Not restricted

TOLERANCE ON DIMENSIONS

Length	+/-1.0 mm
Width	+/-0.15 mm
Thickness	+/-0.20 mm
Tongue's length	≥ 4.0 mm
Tongue & groove	≤ 0.4 mm

Note: Length and width of planks refer to the respective measurements without including the length of the tongue on the length or width of the plank.

TOLERANCE ON SHAPE AND POSITION

Warp	Spring	If plank's length ≤ 500 mm, ≤ 0.02% of plank's length is allowed; If > 500 mm, ≤ 0.03% is allowed
	Cup	Convex warping: ≤ 0.2% of plank's width; concave warping: ≤ 0.15% of plank's width
	Bow	≤ 0.3% of plank's length
Gap		≤ 0.4 mm
Height difference between planks at joint		≤ 0.3 mm

OTHERS

Moisture content：7% ≤ moisture content ≤ balance moisture level of locality
Varnish adherence force: Grade A: level 0-1; Grade B: level 2; Grade C: level 3

Nature (N) is a mixture of A and B grade
Rustic (R) is a mixture of C and D grade
D grade is any grade lower than C grade