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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.

Kempas/Merbau/Walnut
Defects	Top Face		Back Face
Defects	Grade AB	Grade C	Back Face
Live knot [G]	2 allowed, diameter ≤ 2 mm	Not allowed	Not restricted in size or number
Dead knot [G]	Not allowed	2allowed, diameter ≤ 5 mm	Not restricted as long as diameter ≤ 20 mm
Wormholes [G]	Not allowed	Few allowed (mending with putty)	Not restricted as long as diameter ≤ 15 mm
Brown line [G]	Not allowed	Not allowed	Not allowed
Sapwood [G]	Not allowed	Length ﹤ 1 mm	Not allowed
Rot [G]	Not allowed	Initial rot	Area of initial rot ≤ 20%
Wane [G]	≤ 0.5 mm	≤ 1 mm	Length ≤ 30% of plank's length; Width ≤ 20% of plank's width
Indentation	Not allowed	Slight	Not allowed
Brightness mark	Slight	Allowed	Not allowed
Roller marks	Slight	Allowed	Not allowed
Crack [G]	Not allowed	Closed crack, 1×30 mm (mending with putty)	Not restricted in number, width ≤ 0.5 mm; length ≤ 50 mm
Cut and chatter mark [G]	Not allowed	Not distinct	Not allowed
Scratches on varnish	Slight	Slight	Not allowed
Blister [G]	Not allowed	Not allowed	Not allowed
Wrinkling [G]	Not allowed	< 5% of plank's area	Not allowed
Surface of varnish	Fully sealed	Not to affect maintenance	Not allowed
Exposed undercoat [G]	Not allowed	Not allowed	Not allowed
Pin holes	3 allowed, diameter ≤ 0.5 mm	3 allowed, diameter ≤ 0.5 mm	Not allowed
Nib [G]	4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm	4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm	Not allowed

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