Floor Sourcing Services
Home ASK Us Reference Standards Plywood Standard GBT 9846-2015

Plywood Standard GBT 9846-2015

This standard specifies the definition, category, requirements,testing manners,rules of inspection, marks, package, transportation and storage of plywood for general use.

Have A Question?
  • Reference Standards Detail

QUALITY CONTROL STANDARD-PLYWOOD

 

Scope

This standard specifies the definition, category, requirements,testing manners,rules of inspection, marks, package, transportation and storage of plywood for general use.

This standard is only applicable to plywood for general use.

 

 Size and Deviation

 Range of nominal thickness(t)

Unsanded board

Sanded board(surface)

Common difference of inner thickness

Difference of nominal thickness

Common difference of inner thickness

Difference of nominal thickness

t3

0.5

+0.4

-0.2

0.3

±0.2

3t7

0.7

+0.5

-0.3

0.5

±0.3

7t12

1.0

+(0.8+0.03t)

-(0.4+0.03t)

0.6

+0.2+0.03t

-0,4+0.03t

12t25

1.5

0.6

+(0.2+0.03t)

-(0.3+0.03t)

t25

0.8

 

The Appearance & Quality Requirements


Allowed Defects for Different Classes of Hardwood Plywood Appearance

Defects type

Item

Surface

Back face

Superior

First-class

Qualified

Pin holes

Allowed

Intergrown knot

Maximum single diameter/mm

10

20

Unlimited

Partiqlly intergrown knot, dead knot, bark pocket

Total number on 1m2's surface

Not allowed

4

6

Unlimited

Partiqlly intergrown knot

Maximum single diameter/mm

Not allowed

15(if the number ≤5, it shall be ignored)

Unlimited

Dead knot

Maximum single diameter/mm

Not allowed

4   (if the number ≤2, it shall be ignored)

15

Unlimited

Bark pocket

Single maximum length/mm

Not allowed

20(if the number 5, it shall be ignored)

Unlimited

Abnormal structure of wood

Allowed

 Cracks

Single maximum width/mm

Not allowed

1.5

for linden 0.5

3

for linden1.5

for wood from south China 4

6

Single maximum length/mm

200

wood from South China 250

400

for wood from south China 450

800

for wood from south China 1000

 Worm holesdog holes, holes

Maximum single diameter/mm

Not allowed

4

8

15

Total number on 1m2's surface

4

Sieve pores are not allowed

 Discoloration

Shall not exceed % the area of board

Not allowed

30

Unlimited

Note 1Streaks with light color shall be seen as color variation.

Note 2: For class 1 products, the width of streaks with deep color shall not exceed 2mm, and the length shall not exceed 20mm.

Note 3:For birch products,except for superior products, false heartwood is allowed, but the gloss of first-class products shall be harmonious.

Note 4: For first class birch products, dense brown or black pith flecks are not allowed.

Note 5: Sapwood and heartwood with different colors shall be seen as a case of color variation.

Decay

Not allowed

Initial decay is allowed if the strength is not influenced, but the area shall not

 exceed 1% of the board area.

Initial decay is allowed

Gum duct

Single maximum length/mm

Not allowed

150

Unlimited

Single maximum width/mm

10

Total number on 1m2's surface

4

Assembled gap on the surface

Single maximum width/mm

Not allowed

0.5

1

2

The single maximum length is % the length of board

10

30

50

Total number within a width of 1m

1

2

Unlimited

 Folded layers

Single maximum width/mm

Not allowed

8

10

The single maximum width is % the width of board

20

Unlimited

 Core gaps and overlaps

Core gaps and overlaps stick closely to the surface board

Single maximum width/mm

Not allowed

 

2

6

8

Total number within a width of 1m

2

Unlimited

Maximum gap width in other layers

8

gaps and overlaps of cross-band veneer

 

Single maximum width/mm

Not allowed

8

 Blisteringlayering

Not allowed

 Dents,press marksblisering

maximum area/mm2

Not allowed

50

400

Unlimited

Total number on 1m2's surface

1

4

 Burrs

shall not exceed % the the area of board

Not allowed

1

2

Unlimited

the depth shall not exceed/mm

0.2

Penetration is not allowed

 

The surface is sanded through

Total number on 1m2's surface

Not allowed

400

Unlimited

Glue penetration and other man-made contamination

Shall not exceed % the area of board

Not allowed

0.5

30

Unlimited

Repair patch, repair strip

Allowable number for well-made, firmly repaired ones

Not allowed

3

Unlimited

Unlimited

The cumulative area shall not exceed % the area of board

0.5

3

The crack shall not be longer than/mm

0.5

1

2

Include aluminum-made staple

  Not allowed

Deformity on the edge

within nominal size, shall not exceed /mm

 Not allowed

10

Other defects

Not allowed

Count them as their most similar defect types

 

Allowed Defects for Different Classes of Coniferous Tree Plywood Appearance

Defects type

Item

Surface

Back face

Superior

First-class

Qualified

Pin holes

Allowed

Intergrown knots,partially intergrown knot, dead knot, bark pocket

Total number on 1m2's surface

5

8

10

Unlimited

Intergrown knot

Maximum single diameter/mm

20

30,(if the number 10, it shall be ignored)

 

Unlimited

Partially intergrown knotdead knot

Maximum single diameter/mm

 

5(if the number 2, it shall be ignored)

30(if the number 10, it shall be ignored)

Unlimited

Abnormal structure of wood

Allowed

Bark pocketresin pocket

Total number on 1m2's surface

3

4

(if the number 10,

it shall be ignored)

10

(if the number 15, 

it shall be ignored)

Unlimited

Single maximum length/mm

15

30

Unlimited

Cracks

Maximum single width/mm

Not allowed

1

2

6

Single maximum length/mm

200

400

1000

Wormholes, dogholes

Maximum single diameter/mm

Not allowed

2

10

15

Total number on 1m2's surface

4

10( if the number 3, it shall be ignored)

Sieve pores are not allowed

Color variation

shall not exceed % the the area of board

Not allowed

Light color 10

Not allowed

Decay

Not allowed

1%Initial decay is allowed if the strength 

is not influenced, but the area shall not 

exceed 1% of the board area.

Initial decay is allowed

Resinous woodresinous streak)

Single maximum length/mm

Not allowed

150

Unlimited

Maximum single width/mm

10

Total number on 1m2's surface

4

Assembled gap on the surface

Single maximum width/mm

Not allowed

0.5

1

2

The single maximum length is % the length of board

10

30

50

Total number within a width of 1m

 

1

2

Unlimited

Folded layers

Single maximum width/mm

Not allowed

2

10

 The single maximum width is % the width of board

20

Unlimited

Core gaps and overlaps

Core gaps and overlaps stick closely to the surface board

Single maximum width/mm

Not allowed

2

4

8

Total number within a width of 1m

2

Unlimited

Maximum gap width in other layers

8

Gaps and overlaps of cross-band veneer

Single maximum width/mm

Not allowed

8

Blisteringlayering

Not allowed

Dents,press marksblisering

Single maximum area/mm2

Not allowed

50

400

Unlimited

Total number on 1m2's surface

2

6

Burrs

shall not exceed % the the area of board

Not allowed

5

20

 Unlimited

the depth shall not exceed/mm

0.5

Penetration is not allowed

 

The surface is sanded through

Total number on 1m2's surface

Not allowed

400

Unlimited


Glue penetration and other man-made contamination



Shall not exceed % the area of board

Not allowed

1

Unlimited

Repair patch, repair strip

Allowable number for well-made, firmly repaired ones

 Not allowed

6

 

Unlimited

The cumulative area shall not exceed % the area of board

1

5

Unlimited

The crack shall not be longer than/mm

0.5

1

2

Include aluminum-made staple

Not allowed

Deformity on the edge

within nominal size, shall not exceed /mm

 Not allowed

10

Other defects

Not allowed

Count them as their most similar defect types

 

Allowed Defects for Different Classes of Tropical Hardwood Plywood Appearance

Defects type

Item

Surface

Back face

Superior

First-class

Qualified

Pin holes

Allowed

Intergrown knot

Maximum single diameter/mm

10

20

Unlimited

Partially intergrown knot, dead knot, bark pocket

 

Total number on 1m2's surface

Not allowed

3

5

Unlimited

Partially intergrown knot

Maximum single diameter/mm

10,if the number 5, it shall be ignored)

 

Unlimited

Dead knot

Maximum single diameter/mm

4(if the number 2, it shall be ignored)

15

Unlimited

Abnormal structure of wood

Allowed

Cracks

Single maximum width/mm

Not allowed

1.2

2

6

Single maximum length/mm

250

350

800

Bark pocket

Total number on 1m2's surface

Not allowed

2

4

Unlimited

Single maximum length/mm

10(if the number 5, it shall be ignored)

Unlimited

Worm problems

Worm holes

Total number on 1m2's surface

Not allowed

8(if  1.5mm, it shall be ignored)

8

15

Single maximum diameter/mm

2

 Sieve pores are not allowed

Worm ducts

Total number on 1m2's surface

Not allowed

2

Single maximum length/mm

10

Dog holesholes

Single maximum diameter/mm

Not allowed

2

8

15

Total number on 1m2's surface

1

Unlimited

Discoloration

Shall not exceed % the area of board

Not allowed

5

Unlimited

Decay

Not allowed

1%

Initial decay is allowed if the strength is not influenced, but the area shall not exceed 1% of the board area.

Initial decay is allowed

Gum duct

Single maximum length/mm

Not allowed

150

Unlimited

Single maximum width/mm

10

Total number on 1m2's surface

4

Assembled gap on the surface

Single maximum width/mm

Not allowed

1

2

The single maximum length is % the length of board

30

50

Total number within a width of 1m

 

2

Unlimited

Folded layers

Single maximum width/mm

Not allowed

2

10

 The single maximum width is % the width of board

20

Unlimited

Core gaps and overlaps

Core gaps and overlaps stick closely to the surface board

Single maximum width/mm

Not allowed

2

4

8

Total number within a width of 1m

 

2

Unlimited

Maximum gap width in other layers

Not allowed

8

Gaps and overlaps of cross-band veneer

Single maximum width/mm

Not allowed

8

Blisteringlayering

Not allowed

Dents, indentations, drums

Total number on 1m2's surface

Not allowed

1

4

Unlimited

Burrs

shall not exceed % the the area of board

Not allowed

1

25

Unlimited

Maximum depth

0.4

Penetration is not allowed

The surface is sanded through

Total number on 1m2's surface

 Not allowed

400

Unlimited

Glue penetration and other man-made contamination

Shall not exceed % the area of board

Not allowed

0.5

30

Unlimited

Repair patch, repair strip

Allowable number for well-made, firmly repaired ones

Not allowed

3

Unlimited

Unlimited

The cumulative area shall not exceed % the area of board

0.5

3

The crack shall not be longer than/mm

0.5

1

2

Include aluminum-made staple

 Not allowed

Deformity on the edge

within nominal size, shall not exceed /mm

 Not allowed

10

(24)Other defects

Not allowed

Count them as their most similar defect types

  

Moisture Content

Wood variety of plywood

Category

III Category

III Category

Hardwoods(include tropical hardwoods

5~14

5~16

Coniferous wood

Category I: The ones which can past boiling test and can be used in outdoor environment.

Category IIThe ones which can past 63℃±3hot water dipping test, can be made into wet conditions as moisture-resistant plywood.

Category III:The ones which can past 20℃±3cold water dipping test, can be made into dry conditions as moisture-prone plywood.

  

Requirements for binding strength

Tree variety/Wood name/Name of foreign commercial goods

Category

I,II category

III category

Basswood, cypress, sample, paulownia wood, rubber wood, meranti, Okoume, white wutong, Anisoptera spp, Calophyllum inophyllum, eucalyptus wood

0.70

0.70

Northeast China ash, lotus wood, sweetgum, maple wood, elm, Chinese oak, apitong, cloning, kapur

0.80

Birch

1.00

Pinus massoniana, yunnan pine pine, larch, spruce, monterey pine

0.80

 

MOR and MOE Requirements

Item

t/mm

7t9

9t12

12t15

15t21

t21

MOR(modulus of rupture)

parallel to the grain

32.0

28.0

24.0

22.0

24.0

across the grain

12.0

16.0

20.0

20.0

18.0

MOE(modulus of elasticity)

parallel to the grain

5500

5000

5000

5000

5500

across the grain

2000

2500

3500

4000

3500



MARKS、PACKAGE、TRANSPORTATION AND STORAGE


Package 

The products shall be packed properly based on categories and specifications.Each package shall bear product name, wood variety of width of surface and cross-band veneer, grade, factory name, brand, size, quantity, product standard code and inspection labels with formaldehyde release limit marks.


Transportation and Storage

Products shall be kept safe from dampness, rain, exposure to strong sunlight and distortions during transportation or storage period.

A free consultation

We focus on floor inspections only, we try to help you to solve all the questions in flooring line.

Related Products

Wood Plastic Composite Flooring Wood Plastic Composite Flooring

WPC Flooring Standard GB/T24508-2009

WPC Flooring Standard of Size, Appearance, Defects, Physical And Chemical Performance And Lab Testing methods.

Parquet Flooring Parquet Flooring

Multiple Wood Flooring Standards GB/T 18103-2000

Standard Specification for Engineered Wood Flooring , Engineered Wood Flooring Appearance, Engineered Wood Flooring Quality Requirements.

cork flooring reviews cork flooring reviews

Cork Flooring Standard

Standard Specification for Types Of Cork Flooring, Cork Floor Tile Inspection, Cork Flooring Problem.

Strand Woven Bamboo Flooring Strand Woven Bamboo Flooring

Strand Woven Bamboo Flooring Standard GB/T 30364-2013

Standard Specification for Outdoor use the anti-corrosion of real wood floor, Outdoor use the anti-corrosion of real wood floor Appearance And Quality Requirements.

Hardwood Flooring Hardwood Flooring

Hardwood Flooring Standard

Standard Specification for Hardwood Flooring,Hardwood Flooring Appearance, Hardwood Flooring Quality Requirements.

Laminated Floor Laminated Floor

Laminate Floor Standard GB/T 23471-2009

Standard Specification for Laminate Floor, Laminate Floor Appearance And Quality Requirements.

High Density Fiberboard High Density Fiberboard

HDF Board Standard GB∕T 31765-2015

This standard specifies the definition, category, requirements,testing manners,rules of inspection, marks, package, transportation and storage of high density fiberboard.

Outdoor WPC Flooring QC Outdoor WPC Flooring QC

QUALITY CONTROL STANDARD-WOOD PLASTIC COMPOSITE FLOORING OUTDOOR 

QUALITY CONTROL STANDARD-WOOD PLASTIC COMPOSITE FLOORING OUTDOOR  SCOPE   This standard specifies the requirements of WPC floor for export, test methods, inspection rules and packaging, transportation and storage requirements.    TECHNICAL REQUIREMENTS  Size And Deviation  Length 0~+10mm, Negative tolerance is not allowed Width ±1mm, the difference between the maximum and minimum values ≤3 mm Thickness thickness<25mm, ±0.5mm thickness≥25mm,±1.0mm Tolerance on wall thickness ±0.5mm Structure wood plastic composite Bevel need negotiation by the Customer and factory Straight Angle ≤ 0.30mm Straightness ≤ 1.0mm Model of click should be the same as the confirmed steel model Note: No tongue WPC flooring does not required height difference and gap; If have tongue and groove, the width of tongue should be more than 3mm. For wpc flooring, the weight should be more than 95% of WPC weight which two parts agreed.   WPC Flooring Appearance & Quality Requirements  In addition to the design effect, the color should be uniform, the surface is flat, no scratch, no obvious concave and convex, the impurity, the end should be straight, no burr. Item Superior product Qualified product Color unmatching It is allowed if not too obvious Surface unevenness Not allowed It is allowed if not too obvious Split, crack Not allowed Spots,dirt and similar surface defects ≤4mm², allowable amount is 1pc/m ≤4mm², allowable amount is 3pcs/m Blister Not allowed Bubble Not allowed Trace grain Not allowed It is allowed if not too obvious Surface granular Not allowed It is allowed if not too obvious Incomplete sander-polishing Not allowed Tongue and corner deformity Not allowed The board face concave and convex is only used for judging the plane plastic wood floor   WPC Flooring Physical And Chemical Performance Requirements   Test Item Test method Standard  Water absorption of 24h At room temperature, the immersion time of the sample was 24h±15min ≤2.0%  State after heating( 120℃) (120±2)℃,(30+3)min No bubbles, cracks, pitting  Size change rate after heating(100℃) (100±2)℃,(60+3)min ±1.0% Density   ≥1.2g/cm³ surface abrasion resistance  100*100*1pc sample, install it on the wear tester. When grinding wheel weight (27±2) g, width (51.4±0.6) mm, sand paper 180#0/3 condition, wear 100 turns, remove the specimen from the surface and weigh it ≤0.10g/100r Shore hardness (D type) GB/T2411 ≥60 nail-holding ability surface GB/T 17657-1999 ≥1300N  side ≥1200N Four point bending strength QB/T 4161-2011 (appendix)A ≥18Mpa Four point flexural modulus of elasticity ≥1800Mpa Freeze thawing resistance 24h in room temperature water, then put in ( -29±1) ℃24h, finally put 24h in room temperature environment, then place room temperature 24h, measure bending strength load No skin, no crack, bending strength retention ≥90% degradation testing (1000h) The black label temperature is (65 + 3) C, relative humidity is (50 + 5)%, irradiance is 0.35W/m2@340nm, continuous illumination. Cycle period is 120min, where 102min does not spray water, 18min spray water, aging time is 1000h. The surface of the sample should not be seen by the naked eye, the skin or the crack, the hollow and the uneven color change. 色差color difference:ΔE≤9 Formaldehyde release GB/T17657-1999 ≤0.5mg/L 可溶性铅含量Soluble lead content QB/T 4161-2011 ≤90mg/kg 1. Not test the nail holding ability of a hollow WPC 2. Not test flexural strength and flexural modulus of elasticity when the WPC thickness over 50mm 3. Should grinding treatment of flooring surface when test degradation testing surface color change   PACKING  Product Mark Before the products are stored, they should be tagged in proper parts with their product models, trademarks, production dates, etc. Packing Mark The standard codes , factory name, address, product name, production date, trademarks, specifications, formaldehyde release sign, type, grade, quantity, etc. Package Should be fastened firmly, with plastic film or other soft material package, you need to use other special packing methods agreed by both sides of supply and demand. Transport It should be flat and stacked to avoid heavy pressure, rain prevention and sunscreen, light load and light load.

OUR

NEWSLETTER

   

A free consultation

We focus on floor inspections only, we try to help you to solve all the questions in flooring line.