[G] look up term in glossary.

3-strip | 2-strip | 1-strip

Maple/Birch/Beech 3-strip Standard
Location	Defects		Grade A	Grade B	Grade C
Face Veneer	Live knot [G]		Diameter ≤ 2 mm; sparse	Diameter ≤ 10 mm; sparse	Diameter ≤ 15 mm; sparse
	Dead knot [G]		Not allowed	3 allowed, diameter ≤ 2 mm	3 allowed, diameter ≤ 8 mm
	Sapwood [G]		Allowed	Allowed	Allowed
	Colour variation [G]		Slight	Slight and natural	Natural and harmonic
	Rot [G]		Not allowed	Slight	Slight
	Inbark [G]		Not allowed	3 allowed, length ≤20 mm; width ≤ 3 mm, natural	2 allowed, length ≤ 40 mm, light
	Pith [G]		Not allowed	Not allowed	Not allowed
	Heartwood		Not allowed	Not allowed	Not restricted
	Retrorse veins		Not allowed	Slight	Allow
	Crack [G]		Not allowed	Not allowed	Slight, 1 allowed, diameter ≤ 30 mm (mending)
	Veins		FQ mixed	FQ mixed	FQ mixed
	Black/Blue spot		Not allowed	Not allowed	Slight
	Brown line [G]		Not allowed	Not allowed	Allow
	Dimension shortness		Not allowed	Not allowed	Not allowed
	Glue stains		Not allowed	Not allowed	Slight
	Wormholes [G]		Not allowed	Not allowed	2 allowed, diameter ≤ 2 mm (mending)
	Indentation		Not allowed	Not allowed	Slight
	Strong wooden lump		Not allowed	Slight	Slight
	Discolouration [G]		Not allowed	Not allowed	Slight and natural
	Resin pocket [G]		Not allowed	Not allowed	Diameter < 1 mm
	Wane [G]		Not allowed	Not allowed	Slight
	Wood abnormity		Not allowed	Not allowed	Slight
	Face Veneer Gap	Transverse	0.1 mm	0.2 mm	0.2 mm
		Lengthwise	0.1 mm	0.2 mm	0.2 mm
Middle Layer	Middle Layer Gap		3 mm	3 mm	3 mm
	Rot [G]		Slight, no fall off	Slight, no fall off	Slight, no fall off
	Tongue missing		≤ 20 mm (cumulative) ≤ 1% of plank's length	≤ 20 mm (cumulative) ≤ 1% of plank's length	≤ 30 mm (cumulative) ≤ 3% of plank's length
	Destruction of ends		Not allowed	Slight	≤ 2 mm each end
Back Veneer	Bore hole		Diameter ≤ 30 mm	Diameter ≤ 30 mm	Diameter ≤ 30 mm
	Dead knot [G]		No fall off	No fall off	Allowed
	Wormholes [G]		Few	Slight	Mild
	Inbark [G]		Slight	Slight	Allowed
	Cymbate and round mending		≤ 5% of plank's area	≤ 10% of plank's area	Allowed
	Dry crack		Slight	Slight	Length ≤ 1000 mm; width ≤ 10 mm
	Lack of sanding		Slight	Slight	Allowed
Varnish	Putty mending mark		Not allowed	Not allowed	Slight
	Varnish stains		Not allowed	Not allowed	Slight
	Light not even		Not allowed	Not allowed	Slight
	Varnish protruding over the edge		Not allowed	Not allowed	Slight
	Scratches /Exposed undercoat		Not allowed	Not allowed	Slight
	Varnish not even		Not allowed	Not allowed	Slight
Others	Tongue deflection		Not allowed	Not allowed	Not allowed
	Roughness of the tongue and groove		Not allowed	Not allowed	Slight
	Wanting arris		Not allowed	Not allowed	Slight
	Joining of tongue and groove		Good fit	Good fit	Good fit
	Cup warping concave [G]		Chord ≤ 0.15% of plank's width
	Cup warping convex [G]		Chord ≤ 0.20% of plank's width
	Bow warping concave [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤0.5% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.2% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.2% of plank's length
	Bow warping convex [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤1.0% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.8% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.4% of plank's length
	Height difference		0.1 mm	0.15 mm	0.2 mm
	Roughness of ends		Not allowed	Not allowed	Slight
	Tolerance on dimensions		Length (+/-) 1 mm,Width (+/-) 0.1 mm,Thickness (+/-) 0.15 mm,Gap 0.2 mm

Maple/Birch/Beech 2-strip Standard
Location	Defects		Grade N	Grade R
Face Veneer	Live knot [G]		3 allowed, diameter ≤ 10 mm	Not restricted
	Dead knot [G]		2 allowed, diameter ≤ 5 mm, sparse	3 allowed, diameter ≤ 10 mm, sparse
	Sapwood [G]		Allowed	Allowed
	Colour variation [G]		Slight and natural	Natural and harmonic, low contrast
	Rot [G]		Not allowed	Not allowed
	Inbark [G]		Not allowed	2 allowed, length ≤ 15 mm; width ≤ 4 mm (mending)
	Pith [G]		Not allowed	Not allowed
	Crack [G]		Not allowed	Not allowed
	Brown line [G]		2 allowed, sparse length ≤ 15 mm; width ≤ 3 mm	4 allowed, length ≤ 30 mm; width ≤ 5 mm
	Stains		Not allowed	Not allowed
	Wormholes [G]		Not allowed	5 allowed, sparse diameter ≤ 2 mm (mending)
	Plinth mark		Not allowed	Not allowed
	Discolouration [G]		Not allowed	Slight and natural
	Wane [G]		Not allowed	Not allowed
	Face Veneer Gap	Transverse	0.2 mm	0.2 mm
		Lengthwise	0.2 mm	0.2 mm
Middle Layer	Middle Layer Gap		3 mm	3 mm
	Rot [G]		Slight, no fall off	Slight, no fall off
	Tongue missing		≤ 20 mm (cumulative) ≤ 1% of plank's length	≤ 30 mm (cumulative) ≤ 3% of plank's length
	Destruction of ends		Slight	≤ 2 mm each end
Back Veneer	Bore hole		Diameter ≤ 30 mm	Diameter ≤ 30 mm
	Dead knot [G]		No fall off	Allowed
	Wormholes [G]		Slight	Mild
	Inbark [G]		Slight	Allowed
	Cymbate and round mending		≤ 10% of plank's area	Allowed
	Dry crack		Slight	Length ≤ 1000 mm; width ≤ 10 mm
	Lack of sanding		Slight	Allowed
Varnish	Putty mending mark		Not allowed	Slight
	Varnish stains		Not allowed	Slight
	Light not even		Not allowed	Slight
	Varnish protruding over the edge		Not allowed	Slight
	Scratches /Exposed undercoat		Not allowed	Slight
	Varnish not even		Not allowed	Slight
Others	Tongue deflection		Not allowed	Not allowed
	Roughness of the tongue and groove		Not allowed	Slight
	Wanting arris		Not allowed	Slight
	Joining of tongue and groove		Good fit	Good fit
	Cup warping concave [G]		Chord ≤ 0.15% of plank's width
	Cup warping convex [G]		Chord ≤ 0.20% of plank's width
	Bow warping concave [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤0.5% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.2% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.2% of plank's length
	Bow warping convex [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤1.0% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.8% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.4% of plank's length
	Height difference		0.15 mm	0.2 mm
	Roughness of ends		Not allowed	Slight
	Tolerance on dimensions		Length (+/-) 1 mm,Width (+/-) 0.1 mm,Thickness (+/-) 0.15 mm,Gap 0.2 mm

Maple/Birch/Beech 1-strip Standard
Location	Defects		Grade N	Grade R
Face Veneer	Live knot [G]		3 allowed, diameter ≤ 10 mm	Not restricted
	Dead knot [G]		2 allowed, diameter ≤ 5 mm, sparse	3 allowed, diameter ≤ 10 mm, sparse
	Sapwood [G]		Allowed	Allowed
	Colour variation [G]		Slight and natural	Natural and harmonic, low contrast
	Rot [G]		Not allowed	Not allowed
	Inbark [G]		Not allowed	2 allowed, length ≤ 15 mm; width ≤ 4 mm (mending)
	Pith [G]		Not allowed	Not allowed
	Crack [G]		Not allowed	Not allowed
	Brown line [G]		2 allowed, sparse length ≤ 15 mm; width ≤ 3 mm	4 allowed, length ≤ 30 mm; width ≤ 5 mm
	Stains		Not allowed	Not allowed
	Wormholes [G]		Not allowed	5 allowed, sparse diameter ≤ 2 mm (mending)
	Plinth mark		Not allowed	Not allowed
	Discolouration [G]		Not allowed	Slight and natural
	Wane [G]		Not allowed	Not allowed
	Face Veneer Gap	Transverse	0.2 mm	0.2 mm
		Lengthwise	0.2 mm	0.2 mm
Middle Layer	Middle Layer Gap		3 mm	3 mm
	Rot [G]		Slight, no fall off	Slight, no fall off
	Tongue missing		≤ 20 mm (cumulative) ≤ 1% of plank's length	≤ 30 mm (cumulative) ≤ 3% of plank's length
	Destruction of ends		Slight	≤ 2 mm each end
Back Veneer	Bore hole		Diameter ≤ 30 mm	Diameter ≤ 30 mm
	Dead knot [G]		No fall off	Allowed
	Wormholes [G]		Slight	Mild
	Inbark [G]		Slight	Allowed
	Cymbate and round mending		≤ 10% of plank's area	Allowed
	Dry crack		Slight	Length ≤ 1000 mm; width ≤ 10 mm
	Lack of sanding		Slight	Allowed
Varnish	Putty mending mark		Not allowed	Slight
	Varnish stains		Not allowed	Slight
	Light not even		Not allowed	Slight
	Varnish protruding over the edge		Not allowed	Slight
	Scratches /Exposed undercoat		Not allowed	Slight
	Varnish not even		Not allowed	Slight
Others	Tongue deflection		Not allowed	Not allowed
	Roughness of the tongue and groove		Not allowed	Slight
	Wanting arris		Not allowed	Slight
	Joining of tongue and groove		Good fit	Good fit
	Cup warping concave [G]		Chord ≤ 0.15% of plank's width
	Cup warping convex [G]		Chord ≤ 0.20% of plank's width
	Bow warping concave [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤0.5% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.2% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.2% of plank's length
	Bow warping convex [G]		Irrespective of grading: Tongue and Groove with top veneer ≤ 1 mm: Chord ≤1.0% of plank's length Tongue and Groove with top veneer > 1 mm: Chord ≤0.8% of plank's length Glue-less system with top veneer > 1 mm: Chord ≤0.4% of plank's length
	Height difference		0.15 mm	0.2 mm
	Roughness of ends		Not allowed	Slight
	Tolerance on dimensions		Length (+/-) 1 mm,Width (+/-) 0.1 mm,Thickness (+/-) 0.15 mm,Gap 0.2 mm