GB/T 11718-2021 PDF EnglishUS$320.00 · In stock · Download in 9 seconds
GB/T 11718-2021: Medium density fibreboard Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 11718: Historical versions
Similar standardsGB/T 11718-2021: Medium density fibreboard---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT11718-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 79.060.20 CCS B 70 Replacing GB/T 11718-2009 Medium density fibreboard 中密度纤维板 (ISO 16895:2016, Wood-based panels -- Dry-process fibreboard, NEQ) ISSUED ON: NOVEMBER 26, 2021 IMPLEMENTED ON: JUNE 01, 2022 Issued by: State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms, definitions and abbreviations ... 5 4 Classification ... 8 5 Requirements ... 8 6 Measurement and test methods ... 17 7 Specification limits ... 21 8 Inspection rules ... 22 9 Marking, packaging, transportation and storage ... 24 Annex A (normative) Calculation of 5% and 95% quantiles ... 26 Bibliography ... 28 Medium density fibreboard1 ScopeThis document specifies the terms, definitions and abbreviations, classification, requirements, measurement and test methods, inspection rules, marking, packaging, transportation and storage of medium density fiberboard. This document applies to medium density fiberboard produced by the dry process.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2828.1-2012, Sampling procedures for inspection by attributes -- Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 17657-2013, Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels GB/T 18259-2018, Terminology for wood-based panels and their surface decoration GB/T 19367-2009, Determination of dimensions of wood-based panels LY/T 1717-2007, Guide for sampling inspection of wood-based panels3 Terms, definitions and abbreviations3.1 Terms and definitions The terms and definitions defined in GB/T 18259-2018 and LY/T 1717-2007 and the following apply to this document. 3.1.1 medium density fibreboard; MDF The board that is made of wood fiber or other plant fiber, which is prepared by fiber preparation, applied with synthetic resin, and pressed under heating and pressure conditions. The density ranges from 0.65 g/cm3~0.80 g/cm3. NOTE: The density ranges specified in this document are for guidance only. Manufacturers may classify products as MDF boards of a specified type if their density is within ±10% of the density range and they meet all the performance requirements of a specified type of MDF board. For example, a fiberboard with a density of 0.83 g/cm3 may also be called MDF if it meets all the performance requirements of a specified type of MDF board grade. 3.1.2 general purpose medium density fibreboard Medium density fiberboard for non-furniture or non-structural grade applications. Example: Temporary display boards and partition boards used in exhibitions, etc. [Source: GB/T 18259-2018, 3.2.18, modified] 3.1.3 furniture grade medium density fibreboard Medium density fiberboard used for furniture or decoration usually requires secondary surface processing. [Source: GB/T 18259-2018, 3.2.19] 3.1.4 load bearing medium density fibreboard Medium density fiberboard usually used for small structural parts, or used in load- bearing conditions. [Source: GB/T 18259-2018, 3.2.20] 3.1.5 building medium density fibreboard Medium density fiberboard for general construction. Example: window frames, door linings, etc. 3.1.6 dry conditions Indoor environment or outdoor environment with protective measures. The moisture content of the material in this state is equivalent to the moisture content in an environment with a temperature of 20°C and a relative humidity not higher than 65% (or the relative humidity exceeds 65% only for a few weeks in a year). [Source: GB/T 18259-2018, 2.54] 3.1.7 humid conditions Indoor environment or outdoor environment with protective measures. Usually refers to an environment with a temperature of 20°C and a relative humidity higher than 65% but not exceeding 85%, or an environment with a relative humidity exceeding 85% for only a few weeks in a year. 3.1.8 humid conditions-temperate Indoor environment or outdoor environment with protective measures. The moisture content of the material in this state is equivalent to the moisture content in an environment with a temperature of 20°C and a relative humidity higher than 65% but not exceeding 85% (or the relative humidity exceeds 85% for only a few weeks in a year). [Source: GB/T 18259-2018, 2.55, modified] 3.1.9 humid conditions-tropical Indoor environment or outdoor environment with protective measures. The moisture content of the material in this state is equivalent to the moisture content in an environment with a temperature of 30°C and a relative humidity higher than 65% but not exceeding 85% (or the relative humidity exceeds 85% for only a few weeks in a year). [Source: GB/T 18259-2018, 2.56, modified] 3.1.10 high-humid conditions Indoor environment or outdoor environment with protective measures. The moisture content of the material in this state is equivalent to the moisture content in an environment with a temperature higher than 30°C and a relative humidity higher than 85%, or in an environment where it may occasionally come into contact with water (except immersion or watering). [Source: GB/T 18259-2018, 2.57] 3.1.11 exterior conditions Environmental conditions under outdoor natural climatic conditions. [Source: GB/T 18259-2018, 2.58] 3.2 Abbreviations BL: building EXT: exterior F: fungi retardant FN: furniture; furniture making, cabinet making and joinery, as well as surface decoration of these substrates FR: fire retardant 5.3.5 Additional instructions for performance requirements of load-bearing and construction products The product performance requirements specified in Tables 11~17 are not used as characteristic values for engineering design applications. If medium density fiberboard is classified as a load-bearing board or specified for building structure application and is used as a substitute for a specific load-bearing purpose, its relevant characteristic performance shall also comply with the requirements of relevant national standards (specifications). 5.4 Formaldehyde emission limit The requirements for formaldehyde emission limits for indoor medium density fiberboard are shown in GB 18580-2017. The formaldehyde emission of furniture grade medium density fibreboard (MDF-FN EXT) for outdoor use shall be determined by negotiation between the supplier and the purchaser. 5.5 Moisture resistance The moisture resistance performance in Table 5, Table 6, Table 8, Table 9, Table 10, Table 12 and Table 13 specifies the requirements corresponding to three optional test methods (Option 1, Option 2 and Option 3). Only one of the three options needs to be met, which is determined or clearly stated by the supplier and the purchaser through negotiation. 5.6 Other requirements 5.6.1 Other requirements for medium density fiberboard include but are not limited to the following indicators: screw holding force, surface absorption performance and dimensional stability. 5.6.2 When the purchaser has requirements for other test items, the performance requirements shall be determined through negotiation between the supplier and the purchaser.6 Measurement and test methods6.1 Measurement of dimensions 6.1.1 Measuring tools 6.1.1.1 Micrometer: graduation value is 0.01 mm. 6.1.1.2 Steel ruler: graduation value is 0.5 mm. 6.1.1.3 Steel tape measure: graduation value is 1.0 mm. 6.1.1.4 Metal wire (such as steel wire, etc.): diameter is not more than 0.5 mm. 6.1.2 Measurement of length, width and thickness of boards 6.1.2.1 The thickness of the board shall be in accordance with 8.1 of GB/T 19367-2009. 6.1.2.2 The length and width of the board shall be in accordance with 8.2 of GB/T 19367-2009. 6.1.3 Verticality measurement Perform according to 8.3 of GB/T 19367-2009. 6.2 Sampling and test piece preparation 6.2.1 Instruments 6.2.1.1 Micrometer: graduation value is 0.01 mm. 6.2.1.2 Vernier caliper: graduation value is 0.1 mm. 6.2.1.3 Balance: sensitivity is 0.01 g. 6.2.2 Methods 6.2.2.1 The sample shall be drawn in accordance with 8.2.2. The size, quantity and number of the test pieces are shown in Table 18. The size of the test pieces shall be measured in accordance with 4.1 of GB/T 17657-2013. 6.2.2.2 For the same performance test pieces, the distance between each other shall not be less than 100 mm, see Figure 1. If there are appearance defects at the test piece location, the test piece location may be appropriately staggered. If the sample size is insufficient for the test piece, another sample shall be taken from the same batch. 6.2.2.3 The test piece is not allowed to have burnt edges. The edges shall be straight and the adjacent sides shall be right angles. The test shall be carried out in accordance with 4.14 of GB/T 17657-2013. The test piece needs to be balanced. 6.11 Determination of internal bonding strength after boiling water The test shall be carried out in accordance with 4.13 of GB/T 17657-2013. The test piece needs to be balanced. 6.12 Determination of static bending strength after immersion in water at 70°C The test shall be carried out in accordance with 4.9 of GB/T 17657-2013. The test piece needs to be balanced. 6.13 Determination of screw holding force Perform according to 4.21 of GB/T 17657-2013. 6.14 Determination of surface absorption performance Perform according to 4.28 of GB/T 17657-2013. 6.15 Determination of dimensional stability Perform according to 4.33 of GB/T 17657-2013.7 Specification limits7.1 The performance requirements specified in this document are the specification limits of the product. They are used to determine whether the physical and mechanical properties of the product are qualified. 7.2 For dimensional deviation, density and moisture content, the values in Table 3 are calculated based on the average value. For formaldehyde emission limits, the values given in GB 18580-2017 are calculated based on the average value. 7.3 The following physical and mechanical properties in Tables 4 to 17 are the lower specification limits μL. - Static bending strength; - Elastic modulus; - Internal bonding strength; - Surface bonding strength; - Internal bonding strength after cyclic test; - Internal bonding strength after boiling water; - Static bending strength after 70℃ water immersion treatment. The 5% quantile value x5% calculated from the above performance indicators of a board shall not be less than the lower specification limit μL of the corresponding board type in Table 4 ~ Table 17. 7.4 The following physical property indicators in Tables 4 to 17 are upper specification limits μu. - Water absorption thickness expansion rate; - Water absorption thickness expansion rate after cyclic test. The 95% percentile value x95% calculated from the above performance indicators of a board shall not be greater than the upper specification limit μu of the corresponding board type in Table 4 ~ Table 17. 7.5 The upper and lower specification limits are calculated according to the method in Annex A.8 Inspection rules8.1 Inspection types 8.1.1 Exit-factory inspection The exit-factory inspection includes the following items: a) Appearance quality; b) Specifications and dimensions and deviations; c) Physical and chemical properties: density and density deviation within the board, moisture content, water absorption thickness expansion rate, internal bonding strength, static bending strength. NOTE: Enterprises can use the dryer method, gas analysis method, and perforation extraction method to control the formaldehyde emission limit in production. Establish the correlation with the 1 m3 climate chamber method to confirm that the formaldehyde emission limit of the exit-factory products meets the requirements. For information on formaldehyde emission limit requirements, see GB 18580-2017. 8.1.2 Type inspection In addition to all the items of the exit-factory inspection, type inspection also includes ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 11718-2021 be delivered?Answer: The full copy PDF of English version of GB/T 11718-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 11718-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 11718-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 11718-2021 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 11718-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 11718-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 11718-2021?A step-by-step guide to download PDF of GB/T 11718-2021_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 11718-2021". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
