China Solid Wood Flooring Inspection and grading rules

Solid Wood Flooring : OAK
ItemsFaceBack
grae Agrade Bgrade CD
Sound KnotsФ<3㎜ Length≤500㎜≤2pcsФ≤8mm Length≤500≤2pcsФ≤20㎜ UnlimitedUnlimited
Dead KnotsNot allowedФ≤4㎜ Length≤500≤1pcsФ≤10㎜≤5pcsФ≤20㎜ Unlimited
Worm HoleNot allowedNot allowedФ≤2㎜≤5pcs Must PuffyФ≤15㎜ Unlimited
Black LineNot allowedUnlimitedUnlimitedUnlimited
SAP woodMAPLE Not allowed,BRICH Allowed<10﹪ of Area MAPLE,BRICH AllowedMAPLE Unlimited,BRICH AllowedMAPLE Unlimited,BRICH Allowed
RotNot allowedNot allowedNot allowedDot<20﹪ of Area
DamageNot allowedNot allowedNot allowedLength≤ 30﹪ of length Width≤20﹪ of Width
CrackNot allowedNot allowed0.1×15㎜≤2pcsWidth 0.5㎜ Length 50㎜ Unlimited
Wave MarkNot allowedNot allowedSlightlyUnlimited
Press MarkNot allowedNot allowedSlightlyUnlimited
ScratchNot allowedVery SlightSlightlyUnlimited
BubbleNot allowedNot allowedNot allowedUnlimited
Lacquer UnevenNot allowedNot allowedNot allowedUnlimited
PinNot allowedФ≤0。5≤3pcsФ≤0。5≤3pcsUnlimited
Orange PealNot allowedNot allowed≤5﹪ of AreaUnlimited
Rough≤5pcs≤8pcs≤8pcsUnlimited

Milling Tolerance

BendingShortLength≤500㎜, allowed≤0.02﹪ of length, Length≥500㎜,allowed≤0.03﹪ of length
CuppingBending≤0.2﹪ of width, Cupping≤0.15% of width
Banana≤0.3% of length
Gap≤0.1㎜
High-Low Difference≤0.2㎜


Others: MC: 7%≤MC≤EMC; Varnish adherence: A grade 0-1; B grade 2; Varnish Hardness is up to customer’s request.

Oak 3-layer 3-strip Engineered flooring quality standard
LocationDefectsGrade AGrade BGrade CD
Face VeneerLive knotDiameter ≤ 2mm;
sparse
Diameter ≤ 5mm;
sparse
Diameter ≤ 15mm;
sparse
Dead knotNot allowed3 allowed, diameter ≤ 3mm3 allowed, diameter ≤ 10mm
SapwoodNot allowedNot distinct,
natural and harmonic
≤ 25% of plank’s area;
≤ 4-6 pieces (mending)
Colour VariationNatural and harmonicSlightLow contrast
RotNot allowedSlightSlight
InbarkNot allowedNot allowedLight and natural,
2 allowed, diameter ≤ 20mm
PithNot allowedNot allowedNot allowed
Retrorse veinsNot allowedSlightAllowed
CrackNot allowedNot allowedSlight,
1 allowed, diameter ≤ 3mm (mending)
VeinsFQ mixedFQ mixedFQ mixed
Black/Blue spotNot allowedNot allowedSlight
Brown lineNot allowedNot allowedAllowed
Dimension shortnessNot allowedNot allowedNot allowed
Glue stainsNot allowedNot allowedSlight
WormholesNot allowedNot allowed2 allowed,
diameter ≤ 2mm (mending)
IndentationNot allowedNot allowedSlight
Strong wooden lumpNot allowedSlightSlight
DiscolourationNot allowedNot allowedSlight, natural
Resin pocketNot allowedNot allowedLength < 1mm
WaneNot allowedNot allowedSlight
Wood abnormalityNot allowedNot allowedSlight
Face veneer gapTransverse0.1mm0.2mm0.2mm
Lengthwise0.1mm, length > 10mm0.2mm, length > 200mm0.2mm, length > 300mm
Middle LayerMiddle layer gap3mm3mm3mm
RotSlight, no fall offSlight, no fall offSlight, no fall off
Tongue missing≤ 20mm (cumulative)
≤ 1% of plank’s length
≤ 20mm (cumulative)
≤ 1% of plank’s length
≤ 30mm (cumulative)
≤ 3% of plank’s length
Destruction of endsNot allowedSlight≤ 2mm each end
Back VeneerBore holeDiameter ≤ 30mmDiameter ≤ 30mmDiameter ≤ 30mm
Dead knotNo fall offNo fall offAllowed
WormholesFewSlightMild
InbarkSlightSlightAllowed
Cymbate and round mending≤ 5% of plank’s area≤ 10% of plank’s areaAllowed
Dry crackSlightSlightLength ≤ 1000mm;
width ≤ 10mm
Lack of sandingSlightSlightAllowed
VarnishPutty mending markNot allowedNot allowedSlight
Varnish stainsNot allowedNot allowedSlight
Light not evenNot allowedNot allowedSlight
Varnish protruding over the edgeNot allowedNot allowedSlight
Scratches /Exposed undercoatNot allowedNot allowedSlight
Varnish not evenNot allowedNot allowedSlight
OthersTongue deflectionNot allowedNot allowedNot allowed
Roughness of the tongue and grooveNot allowedNot allowedSlight
Wanting arrisNot allowedNot allowedSlight
Joining of tongue and grooveGood fitGood fitGood fit
Cup warping concaveNot allowedChord ≤ 0.15% of plank’s widthChord ≤ 0.15% of plank’s width
Cup warping convexChord ≤ 0.20% of plank’s widthChord ≤ 0.20% of plank’s widthChord ≤ 0.20% of plank’s width
Bow warping concaveChord ≤ 0.10% of plank’s lengthChord ≤ 0.10% of plank’s lengthChord ≤ 0.20% of plank’s length
Bow warping convexChord ≤ 0.50% of plank’s lengthChord ≤ 1% of plank’s lengthChord ≤ 1% of plank’s length
Height difference0.1mm0.1mm0.1mm
Roughness of endsNot allowedNot allowedSlight
Tolerance on DimensionsLength (+/-) 1mm,Width (+/-) 0.1mm,Thickness (+/-) 0.1mm,Gap 0.1mm
Oak  1-strip quality Standard
LocationDefectsGradeAGrade BGrade CGrade D
Face VeneerLive knot  Diameter ≤   2mm ;
sparse
Diameter ≤   5mm ;
sparse
3 allowed, diameter ≤   10mmNot restricted
Dead knot  Not allowed2 allowed, diameter ≤   2mm2 allowed, diameter ≤   5mm , sparse3 allowed, diameter ≤   15mm , sparse
Sapwood  Not allowedNot distinct,
natural and harmonic
≤  5% of plank’s width (mending)≤  30% of plank’s width (mending)
Colour variation  Not allowedNot allowedSlight and naturalNatural and harmonic, low contrast
Rot  Not allowedNot allowedNot allowedNot allowed
Inbark  Not allowedNot allowedNot allowed2 allowed, length ≤   15mm ;
width ≤   4mm (mending)
Pith  Not allowedNot allowedNot allowedNot allowed
Crack  Not allowedNot allowedNot allowedNot allowed
Brown lineNot allowedNot allowed2 allowed, sparse
length ≤   15mm ; width ≤   3mm
4 allowed,
length ≤   30mm ; width ≤   5mm
StainsNot allowedNot allowedNot allowedNot allowed
Wormholes  Not allowedNot allowedNot allowed5 allowed, sparse
diameter ≤   2mm (mending)
Plinth markNot allowedNot allowedNot allowedNot allowed
DiscolourationNot allowedNot allowedNot allowedSlight and natural
Wane  Not allowedNot allowedNot allowedNot allowed
Middle LayerMiddle Layer Gap3mm3mm3mm3mm
Rot  Slight, no fall offSlight, no fall offSlight, no fall offSlight, no fall off
Tongue missing≤   20mm (cumulative)
≤  1% of plank’s length
≤   20mm (cumulative)
≤  1% of plank’s length
≤   20mm (cumulative)
≤  2% of plank’s length
≤   30mm (cumulative)
≤  3% of plank’s length
Destruction of endsNot allowedNot allowedSlight≤   2mm each end
Back VeneerBore holeDiameter ≤   30mmDiameter ≤   30mmDiameter ≤   30mmDiameter ≤   30mm
Dead knot  No fall offNo fall offNo fall offAllowed
Wormholes  FewFewSlightMild
Inbark  SlightSlightSlightAllowed
Cymbate and round mending≤  5% of plank’s area≤  5% of plank’s area≤ 10% of plank’s areaAllowed
Dry crackSlightSlightSlightLength ≤   1000mm ;
width ≤   10mm
Lack of sandingSlightSlightSlightAllowed
VarnishPutty mending markNot allowedNot allowedNot allowedSlight
Varnish stainsNot allowedNot allowedNot allowedSlight
Light not evenNot allowedNot allowedNot allowedSlight
Varnish protruding over the edgeNot allowedNot allowedNot allowedSlight
Scratches /Exposed undercoatNot allowedNot allowedNot allowedSlight
Varnish not evenNot allowedNot allowedNot allowedSlight
OthersTongue deflectionNot allowedNot allowedNot allowedNot allowed
Roughness of the tongue and grooveNot allowedNot allowedNot allowedSlight
Wanting arrisNot allowedNot allowedNot allowedSlight
Joining of tongue and grooveGood fitGood fitGood fitGood fit
Cup warping concave  Not allowedNot allowedChord ≤  0.15% of plank’s widthChord ≤  0.15% of plank’s width
Cup warping convex  Chord ≤  0.20% of plank’s widthChord ≤  0.20% of plank’s widthChord ≤  0.20% of plank’s widthChord ≤  0.20% of plank’s width
Bow warping concave  Chord ≤  0.10% of plank’s lengthChord ≤  0.10% of plank’s lengthChord ≤  0.10% of plank’s lengthChord ≤  0.20% of plank’s length
Bow warping convex  Chord ≤  0.50% of plank’s lengthChord ≤  0.50% of plank’s lengthChord ≤  1% of plank’s lengthChord ≤  1% of plank’s length
Height difference0.05mm0.05mm0.05mm0.05mm
Roughness of endsNot allowedNot allowedNot allowedSlight
Tolerance on dimensionsLength (+/-) 1mm ,Width (+/-) 0.1mm ,Thickness (+/-) 0.1mm ,Gap 0.1mm

ORDERING DETAILS

MINIMUM ORDER: 200SQ.M

DELIVERY TIME: ABOUT 25 DAYS

SAMPLE AVAILABLE: SMALL PIECES OF SAMPLES FREE OF CHARGE; FULL LENGTH SAMPLES SHOULD BE PAID BEFORE EXPRESSING.

QUALITY CONTROLLING

PROTECTING PRODUCTS-RANDOMLY SELECTS CARTONS TO BE INSPECTED PLANK STABILITY-VERIFY MOISTURE CONTENT SCRATH RESISTANT-TEST VARNISH HARDNESS RESISTANCE AGAINST FLAKING-TEST VARNISH ADHERENCE FITTEST SPECIFICATION-VERIFY VARNISH BRIGHTNESS AND PRECISION MEASURES TO EACH PLANK AND ITS COMPONENT PARTS.

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