Attachment 5

Detailed Rules of Blockboard Futures of Dalian Commodity Exchange

Chapter I General Provisions

The Detailed Rules of Blockboard Futures of Dalian Commodity Exchange (the "Detailed Rules") are formulated pursuant to the Trading Rules of Dalian Commodity Exchange and the Blockboard Futures Contract of Dalian Commodity Exchange for the purpose of standardizing the trading of blockboard futures contracts.

Dalian Commodity Exchange (the "Exchange"), its Members, the clients, the designated delivery warehouses, the designated FOT delivery sites, the designated quality inspection agencies, the designated futures margin depositary banks and other participants in the futures market shall comply with the Detailed Rules.

Where it is not provided in the Detailed Rules, the relevant rules of the Exchange shall apply.

Chapter II Principle Terms of the Contract and Relevant Parameters

The quality standards and quality premiums and discounts for the standard deliverable products and the substitutes under the blockboard futures contracts shall be detailed in the Blockboard Delivery Quality Standards of Dalian Commodity Exchange (F/DCE BB003-2023) as Annex 1 attached hereto.

The blockboard futures contract shall take the form of physical delivery.

The delivery warehouses designated for blockboard shall be divided into the benchmark delivery warehouses and the non-benchmark delivery warehouses. The delivery warehouses designated for blockboard are qualified as designated FOT delivery sites.

The delivery warehouses and FOT delivery sites designated for blockboard, as well as the relevant premiums and discounts shall be determined by the Exchange (detailed in the List of Delivery Warehouses and FOT Delivery Sites Designated for Blockboard of Dalian Commodity Exchange as Annex 2 attached hereto), and may be adjusted by the Exchange as the case may be.

The contract months of the blockboard futures contract are January, March, May, July, September and November.

The trading unit of the blockboard futures contract is 500 Sheets/Lot.

The price quote unit of the blockboard futures contract is CNY/Sheet.

The minimum tick size of the blockboard futures contract is 0.05 CNY/Sheet.

The maximum quantity of orders placed each time for the blockboard futures contract shall be one thousand (1,000) lots.

The standard of trading margins, price limit range and position limit under the blockboard futures contract shall be subject to the relevant provisions of the Measures for Risk Management of Dalian Commodity Exchange.

The last trading day of the blockboard futures contract is the tenth trading day of the contract month.

The last delivery day of the blockboard futures contract is the third trading day after the last trading day.

The ticker symbol of the blockboard futures contract is BB.

Chapter III Delivery and Clearing

Section I General Provisions

The blockboard futures contract applies the exchange of futures for physicals delivery, the daily selective delivery and one-off delivery, in addition to the provisions of this Detailed Rules, the detailed procedures of which are provided in the relevant provisions of the Measures for Trading Management of Dalian Commodity Exchange, the Measures for Delivery Management of Dalian Commodity Exchange and the Measures for Clearing Management of Dalian Commodity Exchange.

For those participating in daily selective delivery, if the standard warehouse receipt delivery is adopted, the corresponding standard warehouse receipt shall be frozen after the application of delivery from the seller holding the standard warehouse receipt, and the trading margins corresponding to its selling positions shall be refunded after the market close on the matching day; after the market close on the handover day, the Exchange will transfer the standard warehouse receipt delivered by the seller to the corresponding matched buyer and make eighty percent (80%) of the payments for goods to the seller Member, and the remaining payments shall be fully settled after the seller Member provides the VAT special invoice; the seller Member shall provide the VAT special invoice to the buyer Member within seven (7) trading days after the matching day.

If the FOT delivery is adopted, the seller's application for delivery shall be confirmed by the designated FOT delivery site; after the market close on the matching day, the trading margins corresponding to the seller Member's matched selling positions will be transformed to be the delivery margins.

The delivery unit of blockboard futures contract shall be five hundred (500) sheets.

The standard warehouse receipt of the blockboard is the standard factory warehouse receipt.

The quality inspection of the blockboard shall be carried out in batches of the same manufacturers, of the same specifications, of the same basic material and the same paper impregnated thermosetting resins.

During the holidays specified by the State Council (including adjusted working days and consecutive holidays) and the weekends immediately before and after such holidays, the designated delivery warehouses and designated FOT delivery sites shall suspend the handover of goods and the relevant business shall be postponed accordingly. Except as forgoing provisions, relevant business on other weekends shall stay normal.

In case of the standard warehouse receipt delivery, the differences of the blockboard futures contract discounts and/or premiums shall be settled between the owner and the designated delivery warehouse; in case of the FOT delivery, the differences of the blockboard futures contract discounts and/or premiums shall be settled by the buyer and the seller on the spot, or the seller may engage a designated FOT delivery site to carry out the settlement on its behalf.

The number of sheets in each blockboard bundle shall be in accordance with the spot practice of the manufacturer. Upon delivery, the blockboard shall be loaded out of the warehouse by bundle and each bundle shall be of the same quantity, the same basic material and the same paper impregnated thermosetting resins, and the sheets falling short of one (1) bundle shall be packed separately. The bundles shall be covered by moisture-proof plastic layer to prevent bumping, scratches and defacements to the products. The total delivery quantity shall not be less than the total quantity of the commodities as specified in the corresponding standard warehouse receipts.

The prices of the packages of the blockboard shall be included in the blockboard contract price.

The dedicated VAT invoice shall be issued for delivery of blockboard.

The delivery commissions, the sampling and inspection costs, the storage fees and other fees of Blockboard shall be separately published by the Exchange and no dissipation fees will be charged.

Section II Standard Warehouse Receipt Delivery

The Measures for Standard Warehouse Receipt Management of Dalian Commodity Exchange shall apply to the generation, circulation and deregistration of the standard warehouse receipts, if not provided in the Detailed Rules.

The manufacturing date of the blockboard commodities shall not be earlier than the sixtieth (60） calendar day prior to the date of application for registration of the standard warehouse receipt of the blockboard warehouse.

The Blockboard standard warehouse receipts which are used for the delivery matching shall be deregistered immediately after the market close on the handover day and after the Exchange has transferred the standard warehouse receipts delivered by the seller to the corresponding matched buyer within that day, except for failure on transfer of the standard warehouse receipts due to the delivery default or discrepancy in delivery matching conditions.

The standard warehouse receipts which are not used for the delivery matching shall be deregistered before the last trading day of each delivery month.

The owner of the goods shall confirm the basic material and paper impregnated thermosetting resins of the delivery goods within two (2) calendar days after the deregistration date of the standard warehouse receipt (exclusive of the deregistration date). Each lot of delivery goods shall have the same basic material and one or two kinds of paper impregnated thermosetting resins. Where the owner chooses two kinds, the number of each kind shall be two hundred (200) or three hundred (300) sheets. The optional basic material and paper impregnated thermosetting resins shall be subject to the Exchange's announcement. If changes occur, the factory warehouse shall notify the Exchange before the market close on the fifth (5) trading day of each April, August, December, and the Exchange shall announce such changes by the seventh (7) trading day of that month.

The factory warehouse shall provide the delivery goods based on the basic material and paper impregnated thermosetting resins the owner chooses. In the case of failure to confirm the choice in time by the owner, the factory warehouse may decide in its discretion the basic material and paper impregnated thermosetting resins of the delivery goods within the range announced by the Exchange.

After confirming the choice of the basic material and paper impregnated thermosetting resins, the owner shall contact the designated delivery warehouse for the loading-out matters and negotiate for the date of goods pick-up in advance. The starting date of goods pick-up shall not be later than the seventeenth (17) calendar day following the deregistration day of the standard warehouse receipt (exclusive of the deregistration day). If the negotiation fails, the factory warehouse shall commence consignment within the seventeenth (17) calendar day (inclusive of the seventeenth calendar day) following the deregistration day of the standard warehouse receipt (exclusive of the deregistration day).

When the blockboard is loaded out of the factory warehouse, the factory warehouse shall carry out the sampling under the owner's supervision, and the samplings shall be sealed after being confirmed by both parties and shall be preserved for thirty (30) calendar days following the consignment day as the basis of settlement in case of disputes over the quality of physical and chemical properties or formaldehyde emission.

If the owner has any objection over the quality of the commodities to be loaded out of the factory warehouse, it shall firstly negotiate with the factory warehouse for settlement. If the negotiation fails, where the owner has objection over the appearance quality, specification and dimension, the owner shall, on the date of goods pick-up and if the commodities have not been loaded out of the factory warehouse, file an application for re-inspection, for which the Exchange shall entrust a designated quality inspection agency to carry out the sampling inspection to the disputed blockboard on spot, and such sampling inspection result shall be the basis for any dispute settlement; where the owner has objection over the kind of basic material, the owner shall, on the date of goods pick-up and if the commodities have not been loaded out of the factory warehouse, file an application for re-inspection, for which the Exchange shall entrust a designated quality inspection agency to carry out the inspection to all disputed blockboard on spot, and such inspection result shall be the basis for any dispute settlement; where the owner has objection over the physical and chemical properties or the formaldehyde emission, the owner shall, within ten (10) working days (exclusive of the tenth working day) after the samples are sealed according to Article 31 of this Detailed Rules, file an application for re-inspection with the Exchange, for which the Exchange shall entrust a designated quality inspection agency to carry out the inspection over the reserved samples, and such sampling inspection result shall be the basis for any dispute settlement.

The owner shall file the application for re-inspection to the Exchange in writing. Such application shall indicate the name of the factory warehouse, the quantity, the quality index, the production date, the stack location number (if any) and other information of the commodities to be re-inspected, leave the contact information and be affixed with the official seal of the owner. If no application is filed in the prescribed manner within the prescribed period, it will be deemed that the owner has no objection over the quality of the commodities that are being loaded out of the factory warehouse. The re-inspection costs shall be advanced by the owner. If the re-inspection result is consistent with the result determined by the factory warehouse, the relevant fees (including but not limited to the inspection fees, traveling expenses, storage fees, stack shifting costs) and sampling loss incurred thereby shall be borne by the owner. Otherwise, the relevant fees (including but not limited to the inspection fees, traveling expenses, storage fees, stack shifting costs) and sampling loss incurred thereby shall be borne by the factory warehouse. If the re-inspection result is consistent with the delivery quality standards, the owner shall pick up the goods normally, and the factory warehouse and the owner will settle the differences of quality discounts and/or premiums according to re-inspection result. If the re-inspection result is inconsistent with the delivery quality standards, the factory warehouse may exchange or repurchase the commodities, with the repurchase payments = 120% of the delivery settlement price of the latest delivery month × the quantity of the commodities which are re-inspected not conforming to the delivery quality standards. In case of exchanging commodities, the factory warehouse shall complete the preparation of the commodities within fifteen (15) working days after its receipt of the dispute re-inspection report. The Exchange shall entrust a designated quality inspection agency to inspect the exchanged commodities; if the exchanged commodities conform to the delivery quality standards, the owner shall not refuse receipt of the exchanged commodities and shall pick up the commodities within ten (10) working days at the factory warehouse after its receipt of the quality inspection report regarding the exchanged commodities, and the factory warehouse and the owner will settle the differences of quality discounts and/or premiums according to re-inspection result; and if no pick-up is made in the prescribed manner within the prescribed period, the factory warehouse will not guarantee that the quality of all commodities will conform to the futures standards. The relevant fees (including but not limited to the inspection fees, travelling expenses, storage fees, stack shifting costs) and sampling loss incurred by exchanging commodities shall be borne by the factory warehouse. If the exchanged commodities fail to conform to the delivery quality standards, the factory warehouse shall repurchase the commodities, with the repurchase payments = 120% of the delivery settlement price of the latest delivery month × the quantity of the commodities which are re-inspected upon commodity exchange not conforming to the delivery quality standards, and the corresponding commodities shall belong to the factory warehouse.

Where the factory warehouse consigns commodities to the owner at a speed no higher than the daily consignment speed but the owner fails to pick up the commodities due to its transportation capability or any other reason attributable to the owner, the owner shall pay to the factory warehouse the late fee as per the quantity of the commodities which shall be, but fail to be, picked up. The late fee is determined as follows:

from the starting date of goods pick-up (inclusive of the pick-up day), for each day, the amount of late fee on the then-current day shall be figured out by multiplying the quantity of the goods which shall be picked up but fail to be picked up on the then-current day by the corresponding amount of late fee; and

to the completion date of goods pick-up (exclusive of the pick-up day), the total amount of late fee which the owner shall pay to the factory warehouse shall be figured out on the basis of totaling the daily amount of late fee.

Amount of late fee = CNY 0.1/Sheet*Day.

If the pick-up is carried out after expiry of the pick-up period (exclusive of the then-current day) and within thirty-one (31) calendar days (inclusive of the then-current day) following the deregistration of the standard warehouse receipt (exclusive of the deregistration day), the owner shall pay the late fee to the factory warehouse, and the factory warehouse shall assume the liability related to the commodity quality, consignment time and consignment speed pursuant to the futures standards, unless all the futures commodities have been consigned.

The late fee shall be determined according to the following method:

from the date of expiration of pick-up period (inclusive of the expiration day), for each day, the amount of late fee on the then-current day shall be figured out by multiplying the quantity of the goods which shall be picked up but fail to be picked up on the then-current day by the corresponding amount of late fee; and

to the completion date of pick-up (exclusive of the pick-up day), the total amount of late fee which the owner shall pay to the factory warehouse shall be figured out on the basis of totaling the daily amount of late fee.

Amount of late fee = CNY 0.1/Sheet*Day.

If the owner picks up the commodities at the factory warehouse after thirty-one (31) calendar days (exclusive of the then-current day) following the date of deregistration of the standard warehouse receipt (exclusive of the deregistration day), the owner shall pay the late fee to the factory warehouse as calculated in the following formula, and the factory warehouse shall assume no liability related to the commodity quality, consignment time and consignment speed under the futures standards.

Amount of late fee = CNY 0.1/Sheet*Day × Quantity of all the commodities × 31 Days.

Where the factory warehouse fails to consign commodities according to the required daily consignment speed but timely completes the consignment of all the commodities, the factory warehouse shall compensate the owner.

Amount of compensation = One-off delivery settlement price of the last delivery month of such commodity × Quantity of the commodities which shall be, but fail to be, consigned according to the required daily consignment speed × 5%

Where the factory warehouse fails to timely complete the consignment of all the commodities, the factory warehouse shall, in addition to the compensation provided in Article 36 of the Detailed Rules, compensate the owner the amount of compensation, the amount of compensation = One-off delivery settlement price of the last delivery month of such commodity × Quantity of the commodities which shall be, but fail to be, consigned according to the total quantity of the commodities × 5%; the following procedures shall apply to such failure:

the Exchange shall supply to the owner the physical commodities of the same quality and quantity of other factory warehouses or locations and bear all the costs and expenses arising out of or in connection with the adjustment of the delivery site and the delayed consignment; or

where the Exchange fails to supply the above commodities, the Exchange shall refund to the owner the payment of the commodities and compensate the owner.

Amount of refunded payment of commodities and compensation = One-off delivery settlement price of the last delivery month of such commodity× Quantity of the commodities which shall be, but fail to be, consigned according to the total quantity of the commodities × 120%.

In the event of any violation by the factory warehouse described in Article 36 or 37 of the Detailed Rules, the compensation shall firstly be paid to the owner by the factory warehouse. Where the factory warehouse fails to pay such compensation or the amount of compensation is insufficient, such violation shall be handled by the Exchange subject to the applicable provisions of the Measures for Standard Warehouse Receipt Management of Dalian Commodity Exchange.

Section III FOT Delivery

The maximum deliverable amount every day on each designated FOT delivery site shall be specified by the Exchange (detailed in the List of Delivery Warehouses and FOT Delivery Sites Designated for Blockboard of Dalian Commodity Exchange as Annex 2 attached hereto).

The blockboard used for the FOT delivery by the seller shall be the blockboard provided by the designated FOT delivery site corresponding to the seller's delivery application. At the time of the FOT delivery, the seller may entrust the FOT delivery site on behalf of the seller, to perform the delivery obligation of blockboard and other related obligations. If the designated FOT delivery site fails to perform such obligations or perform such obligations in violation of relevant provisions, the seller shall bear the corresponding liabilities.

The buyer shall confirm the basic material and paper impregnated thermosetting resins of the delivery goods within two (2) calendar days after the matching day (exclusive of the matching day). Each lot of the delivery goods shall have the same basic material and one or two kinds of paper impregnated thermosetting resins. Where the buyer chooses two kinds, the number of each kind shall be two hundred (200) or three hundred (300) sheets. The optional basic material and paper impregnated thermosetting resins shall be subject to the Exchange's announcement. If changes occur, the designated FOT delivery site shall notify the Exchange before the market close on the fifth (5) trading day of each April, August, December, and the Exchange shall announce such changes by the seventh (7) trading day of that month.

The seller shall provide the delivery goods based on the basic material and paper impregnated thermosetting resins the buyer chooses. In the case of failure to confirm the choice in time by the buyer, the seller may decide in its discretion the basic material and paper impregnated thermosetting resins of the delivery goods within the range announced by the Exchange.

After confirming the choice of the basic material and paper impregnated thermosetting resins, the buyer shall negotiate with the seller on the handover day of goods (i.e., the FOT delivery date) in advance. The FOT delivery date shall not be later than the seventeenth (17) calendar day following the matching day (exclusive of the matching day), except for the case where the buyer and the seller agree to handle the handover of goods on their own according to Article 50 of this Detailed Rules.

The seller shall load the goods to the buyer's transportation vehicle within the FOT delivery date.

If the goods have not started to be loaded to the buyer's transportation vehicles at 13:30 on the FOT delivery date for the reason of the buyer, the seller may store the goods at the designated FOT delivery site.

When the goods are loaded to the buyer's transportation vehicles or stored at the designated FOT delivery site for the reason of the buyer, it shall be deemed that the delivery is completed and the goods ownership is transferred. The handling fee incurred shall be borne by the seller; and all expenses (including but not limited to handling fee and demurrage charge) incurred consequently shall be borne by the buyer.

The designated quality inspection agency shall arrive on site at the time required by the Exchange, record truthfully the arrival of the buyer's transportation vehicles and other relevant circumstances, and report them to the Exchange before the market close on the next trading day immediately following the FOT delivery date.

Upon pick-up thereof, the buyer must provide to the designated FOT delivery site the pick-up person's identity card, the certification issued by his or her employer recognized by the Exchange and the Notice to Load Out or load-out password.

If the buyer fails to pick up the goods on time, the designated FOT delivery site shall not undertake any liability for changes in quality and quantity of the goods caused for reasons not attributable to its fault. The buyer shall pay the demurrage charge to the designated FOT delivery site based on the actual number of storage days (including the FOT delivery date and pickup date). The fee standard shall be separately published by the Exchange, unless otherwise agreed by the buyer and the designated FOT delivery site.

If the buyer has no objection over the quality of the goods handed over, the buyer shall, prior to 11:30 a.m. on the fifteenth (15) trading day following the handover day, confirm the quality and quantity of the goods through the Member. If the buyer fails to do so, it shall be deemed that it has no objection to the quality and quantity of the goods. The Exchange shall refund the seller Member's delivery margin and make eighty percent (80%) of the payments for goods to the seller Member after the market close on the fifteenth (15) trading day following the handover day, and the remaining payments shall be fully settled after the seller Member provides the VAT special invoice.

If the buyer has any objection over the quality of the goods handed over, it shall firstly negotiate with the seller. If the negotiation fails, where the buyer has objection over the appearance quality, specification and dimension, physical and chemical properties or formaldehyde emission, the designated quality inspection agency shall carry out the sampling inspection; where the buyer has objection over the kind of basic material, the designated quality inspection agency shall carry out the inspection to all disputed goods. The inspection result shall be the basis for any dispute settlement. The re-inspection costs shall be advanced by the buyer. If the re-inspection result is consistent with the result determined by the seller, the relevant fees (including but not limited to the inspection fees, traveling expenses, storage fees, stack shifting costs) and sampling loss incurred thereby shall be borne by the buyer. Otherwise, the relevant fees (including but not limited to the inspection fees, traveling expenses, storage fees, stack shifting costs) and sampling loss incurred thereby shall be borne by the seller.

If the re-inspection result is consistent with the delivery quality standards, the buyer shall pick up the goods normally, and the seller and the buyer will settle the differences of quality discounts and premiums according to re-inspection result. The Exchange shall refund the seller Member's delivery margin and make eighty percent (80%) of the payments for goods to the seller Member, and settle the remaining payments after the seller Member provides the VAT special invoice according to the following specified time:

in the case of the objection only involving the appearance quality, specification, dimension and the kind of basic material, the specified time shall be after the market close on the fifteenth (15) trading day following the handover day;

in the case of the objection only involving the physical and chemical properties, the specified time shall be after the market close on the twenty-second (22) trading day following the handover day;

in the case of the objection only involving the formaldehyde emission, the specified time shall be after the market close on the thirty-seventh (37) trading day following the handover day;

in the case of the objections involving several items of the quality, the longest period of time provided for the objection shall prevail.

In the case that re-inspection result is inconsistent with the delivery quality standards, the delivery shall be terminated and handled as the FOT delivery default.

The seller Member shall provide the VAT special invoice corresponding to the actual delivery goods to the buyer Member within seven (7) trading days after the Exchange makes eighty percent (80%) of the goods payments.

FOT delivery default shall mean that, within the stipulated time, the buyer fails to fully make the payments or the seller fails to fully deliver the blockboard conforming to the futures delivery quality standard at the stipulated place.

In case the buyer commits a delivery default, the Exchange shall notify the seller Member after settlement on the handover day, a punitive penalty shall be imposed by the Exchange against the buyer of twenty percent (20%) of the contract value of the defaulted portions calculated at the delivery settlement price on the matching day, which shall be paid to the seller; and the delivery shall terminate. Contract quantity of the buyer's delivery default shall be calculated as per the following formula:

Contract quantity of the buyer's delivery default (Lot) = [the payments which should have been paid (CNY) - the payments which have been paid (CNY)] ÷ [the delivery settlement price (CNY/Sheet) × (1-20%) + the premiums/discounts of designated FOT delivery sites (CNY/Sheet)] ÷ the trading unit (Sheet/Lot).

In case the seller commits a delivery default, the Exchange shall notify the buyer Member within the specified time according to Article 47 Paragraph 2 of the Detailed Rules, and a punitive penalty shall be imposed by the Exchange against the seller of twenty percent (20%) of the contract value of the default portions calculated at the delivery settlement price on the matching day, which shall be paid to the buyer; and the buyer's payments shall be released, and the delivery shall terminate.

Contract quantity for the portions insufficiently delivered by the seller (Lot) = [number of the goods which should have been delivered (Sheet) – number of the goods delivered (Sheet)] ÷ trading unit (Sheet/Lot).

The default quantity shall be calculated in "Lot" and rounded up to the nearest integer.

The buyer and the seller may negotiate to handle the receipt and disbursement of the payments and handover of the goods for the FOT delivery by themselves, the specific processes shall be subject to the applicable provisions of the Detailed Rules and the Measures for Delivery Management of Dalian Commodity Exchange. If the buyer and the seller negotiate to handle the handover of the goods by themselves, but the receipt and disbursement of the payments are handled through the Exchange, the buyer Member shall supplement the full payments for goods before the market close on the handover day, and the Exchange shall transfer all the payments for goods and refund the delivery margins to the seller Member after the market close on the fifteenth (15) trading day following the handover day.

Chapter IV Supplementary Provisions

Any violation of the Detailed Rules shall be handled by the Exchange subject to the applicable provisions of the Measures against Rule Violations of Dalian Commodity Exchange and other rules.

The Exchange reserves the right to interpret the Detailed Rules.

The Detailed Rules shall come into force on July 1, 2019.

Annex 1: Blockboard Delivery Quality Standard of Dalian Commodity Exchange (F/DCE BB003-2023)

Annex 2: List of Delivery Warehouses and FOT Delivery Sites Designated for Blockboard of Dalian Commodity Exchange (Omitted)

Disclaimer: This English translation may be used for reference only. In case there is any discrepancy between the English version and the original Chinese version, the original Chinese version shall prevail. Dalian Commodity Exchange may change or update this English translation without any prior notice and shall accept no responsibility or liability for damage or loss caused by any error, inaccuracy, misunderstanding, or change with regard to this English translation.

Annex 1

Blockboard Delivery Quality Standard of Dalian Commodity Exchange ("DCE") (F/DCE BB003-2023)

Main content and applicable scope

The standard herein (the "Standard") stipulates the quality requirements, inspection methods, sampling methods, determination rules, etc. for blockboard delivered at DCE.

The Standard applies to standard products and substitutes delivered under the blockboard futures contract of DCE.

The blockboard in this Standard refers to blockboard products, i.e., surface decorated plywood and blockboard with paper impregnated thermosetting resins.

Cited rules and standards

The provisions of the following documents are incorporated as the provisions of the Standard by reference. For those cited documents noted with dates, all of their following amendments (excluding corrections) and revised versions shall not be applied to the Standard; for those without noted dates, their latest versions shall be applied to the Standard.

GB/T 34722-2017 Surface Decorated Plywood and Blockboard with Paper Impregnated Thermosetting Resins

GB 18580-2017 Limit of Formaldehyde Emission of Wood-based Panels and Relevant Products of Indoor Decorating and Refurbishing Materials

GB/T 39600-2021 Formaldehyde Emission Grading for Wood-based Panel and Finishing Products

Terms and definitions

Surface decorated plywood and blockboard with paper impregnated thermosetting resins: decorative panels made of film paper impregnated with amino resin fixing on plywood or blockboard substrates by hot pressing.

Other terms and definitions: subject to GB/T 34722-2017.

Quality Requirements

Standard Quality Requirements of Blockboard Futures

Appearance quality

The specific requirements for each side of double-sided decorated surface are as follows:

Quality Defect	Requirement
Frosting mark	3 places are allowed with the total area not exceeding 0.3% panel area
Water mark
Spot, dirt and similar surface defects	1 place for each sheet is allowed within 3mm2—20mm2
Surface scratches	2 places for each sheet with length ≤100mm are allowed but not concentrated in any one square metre; not allowed if affecting the decoration layer
Surface imprint	2 places for each sheet are allowed within 20mm2—50mm2 but not concentrated in any one square metre
Substrate revealment	Not allowed for obvious ones
Misalignment between panel and impregnated paper	Not allowed
Porosity of surface	Total area of porosity of surface not exceeding 1% panel area
Color unmatching	Not allowed for obvious ones
Gloss unevenness	Not allowed for obvious ones
Blisters	Not allowed
Bulge	2 places for each sheet are allowed within 3mm2—20mm2 but not concentrated in any one square metre
Delamination	Not allowed
Tearing of impregnated paper	Not allowed
Bare substrate spots due to defective surface covering	Not allowed
Dents	Not allowed
Surface waviness	3 ones are allowed, if not obvious
Note 1: Severe defects not included in the table that affect the use and decorative effect, such as surface cracks and edge and corner defect (within nominal dimensions), are not allowed.

Note 2: "Not obvious" refers to that, it is not observable to the naked eye at a distance of 0.4m from the product under normal vision under natural light.

Note 3: "Obvious" refers to that, it is clearly observable to the naked eye at a distance of 0.4m from the product under normal vision under natural light.
Specification, dimension and their deviation

Panel dimension and its deviation

Item	Requirement	Allowed deviation/(mm/m)
Width/mm	1,220	±1.5
Length/mm	2,440
Thickness and its derivation

Item	Requirement	Allowed deviation/mm
Thickness/mm	18	no more than ±0.5
Other requirements

Item	Requirement
Verticality	Derivation ≤1.0mm/m
Edge straightness	Derivation ≤1.0mm/m
Flatness	Deviation ≤1%
Physical and chemical properties

Item	Unit	Index	Remarks
Moisture content	%	4.0-16.0	Plywood basic material
6.0-14.0	Blockboard basic material
Bonding strength	MPa	≥0.70	Plywood basic material
Impregnation Stripping	mm	The stripping length of each side of each glue liner on the test specimen shall not exceed 1/3 of the side length (excluding those less than 3mm)	Blockboard basic material
Transverse static bending strength	Average value	MPa	≥15.0	Blockboard basic material
Minimum value
≥12.0
Surface bonding strength	MPa	≥0.60
Resistance to surface scratching	——	≥1.5N no continuous scratches greater than 90% on the surface
Resistance to surface wearing	Abrasion value	mg/100r	≤80
Surface status	Pattern	——	It has the pattern after abrading 100r
Plain	——	It shall be no substrate revealment after abrading 350r
Resistance to surface staining and corrosion	Pattern	——	Reach level 5
Plain	——	Reach more than level 4
Resistance to surface cracking	——	Reach more than level 4
Resistance to surface vapor	——	Reach more than level 4
Formaldehyde emission

Formaldehyde emission limit value ≤ 0.050mg/m3.

Blockboard futures quality discounts and premiums

Item	Limit value of substitute	Quality discounts and premiums (CNY/Sheet)
Formaldehyde emission	>0.050mg/m3 and ≤0.124mg/m3	-10

Inspection and determination

The inspection methods, sampling methods and determination rules for appearance quality, specification, dimension and physical and chemical properties shall be subject to the relevant requirements of GB/T 34722-2017.

The sampling methods of formaldehyde emission shall be subject to the relevant requirements of GB/T 34722-2017; the inspection methods and determination rules shall be subject to GB 18580-2017; the grading and determination rules shall be subject to the relevant requirements of GB/T 39600-2021.

The logo shall be on the side of the products clearly and firmly, marking the trademark, formaldehyde emission and grade and otherwise.

Additional note

The Standard shall be subject to the interpretation of DCE.