Detail of GB/T 17657-2022

Introduction of GB/T 17657-2022

GB/T 17657-2022 Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels WARNING: When the clauses of test methods specified in this document are referenced or used during development and revision of the product standard, the applicable conditions of the test methods specified herein, including but not limited to preparation of specimen, quantity of specimen, specimen treatment, equipment or appliance function, measuring range and accuracy, operation procedures, etc. shall be fully understood, and the suitability of the clauses related to the test methods specified herein to the product standard quality requirements shall be evaluated, and then the appropriate test method shall be selected and determined. 1 Scope This document describes the test methods of evaluating the main properties of wood-based panels and surface decorated wood-based panels. This document is applicable to the tests of properties of wood-based panels, surface decorated wood-based panels and their products. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions 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 250-2008 Textiles - Tests for color fastness - Grey scale for assessing change in color GB/T 601 Chemical reagent - Preparations of reference titration solutions GB/T 730-2008 Textiles - Tests for colour fastness - Quality control of blue wool reference materials 1 to 7 GB/T 845-2017 Cross recessed pan head tapping screw GB/T 846-2017 Cross recessed countersunk head tapping screw GB/T 3190-2020 Wrought aluminium and aluminium alloy - Chemical composition GB/T 3977-2008 Methods of colour specification GB/T 3978-2008 Standard illuminants and geometric conditions GB/T 4893.5-2013 Test of surface coatings of furniture - Part 5: Determination of thickness GB/T 4897 Particleboard GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 7921-2008 Uniform color space and color difference formula GB/T 9286-2021 Paints and varnishes - Cross-cut test GB/T 9761-2008 Paints and varnishes - Visual comparison of the colour of paints GB/T 18259-2018 Terms of wood-based panel and its surface decoration GB/T 26704-2011 Pencil LY/T 1612 1m3 climate chamber for determination of formaldehyde emission JB/T 3889-2006 Coated abrasives - Abrasive cloth 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 18259-2018 and the following apply. 3.1 wood-based panels panels or formed products, which are composed of material units, made from wood or non-wood plant fibers as the main raw materials, with or without adhesive and other additive applied Note: Mainly including plywood, particleboard, fiberboard, etc. [Source: GB/T 18259-2018, 2.1]. 3.2 decorated wood-based panels panels of which the wood-based panel is used as the base, coated or finished with various decorative materials [Source: GB/T 18259-2018, 2.13]. 4 Test methods 4.1 Measurement of dimension of specimen 4.1.1 Method description The thickness, length and width of the specimen are determined by linear measurement. 4.1.2 Instruments 4.1.2.1 Micrometer, or similar measuring tool, of which the measuring range may be selected according to the thickness of the specimen, the measuring head diameter is 6.0mm to 20.0mm, and the division value is 0.01mm. 4.1.2.2 Vernier caliper, of which the measuring range shall meet the length requirements of the specimen, and the division value shall be less than or equal to 0.05mm. 4.1.3 Measurement procedures 4.1.3.1 Measuring location and measuring point The number and location of measuring points are specified in the relevant test methods. 4.1.3.2 Thickness measurement Select the diameter of the micrometer measuring head according to the panel type. In principle, the measuring head with a large diameter shall be used for low-density panels and panels with rough surfaces. Slowly clamp the measuring surface of the micrometer on the specimen (the pressure applied is about 0.02MPa to 0.05MPa), so that the specimen is in close contact with the measuring surface, and read the data. 4.1.3.3 Measurement of length and width Slowly clamp the vernier caliper on the specimen, with the angle between the caliper and the surface of specimen is about 45° (see Figure 1), so as to accurately read and record the data. Figure 1 Measurement method for length and width 4.1.4 Expression of results Thickness: in mm, accurate to 0.01mm; Length and width: in mm, accurate to 0.1mm. 4.2 Determination of density 4.2.1 Method description The ratio of the mass of the specimen to its volume is determined. 4.2.2 Instruments 4.2.2.1 Micrometer, of which the measuring range is 0mm to 25mm, 25mm to 50mm or 50mm to 75mm, and the division value is 0.01mm. 4.2.2.2 Vernier caliper, of which the measuring range is 0mm to 150mm, and the division value is less than or equal to 0.05mm. 4.2.2.3 Balance: with a sensitivity of 0.01g. 4.2.3 Requirements for specimen 4.2.3.1 Dimension of specimen Generally, the specimen length l=(50±1)mm and width b=(50±1)mm. For hollow structural panels with holes and honeycombs, the pipe holes are parallel to the length or width of the specimen, which is at least twice the unit length or width of each pipe hole section (i.e. twice the pipe diameter plus twice the thickness of wall panels), and the specimen shall have a symmetrical cross section, as shown in Figure 2.

Contents of GB/T 17657-2022

Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Test methods 4.1 Measurement of dimension of specimen 4.2 Determination of density 4.3 Determination of moisture content 4.4 Determination of thickness swelling rate of water absorption - Method 1 4.5 Determination of thickness swelling rate of water absorption - Method 2 4.6 Determination of 24h water absorption 4.7 Determination of static bending strength and modulus of elasticity - Three-point bending method 4.8 Determination of static bending strength and modulus of elasticity - Four-point bending method 4.9 Determination of static bending strength - Immersion treatment method 4.10 Determination of static bending strength - Immersion-freezing-drying treatment method 4.11 Determination of internal bonding strength 4.12 Determination of internal bonding strength - 2h boiling water method 4.13 Determination of moisture resistance - Boiling-drying method 4.14 Determination of moisture resistance - Cyclic method 4.15 Determination of surface bonding strength - Method 1 4.16 Determination of surface bonding strength - Method 2 4.17 Determination of bonding strength 4.18 Determination of shear strength of bond line 4.19 Determination of immersion peeling performance 4.20 Determination of peel resistance 4.21 Determination of screw holding force 4.22 Determination of impact toughness 4.23 Determination of low temperature impact toughness 4.24 Determination of tensile strength 4.25 Determination of parallel-to-grain compressive strength 4.26 Determination of accelerated aging property 4.27 Determination of sand content 4.28 Determination of coefficient of sliding friction 4.29 Determination of surface absorbability 4.30 Determination of high temperature resistance 4.31 Determination of color fastness to light 4.32 Determination of color fastness to light yellowing 4.33 Determination of color and luster stability 4.34 Determination of color difference 4.35 Determination of dimensional stability - Method 1 4.36 Determination of dimensional stability - Method 2 4.37 Determination of dimensional stability - Method 3 4.38 Determination of surface resistance to vapor 4.39 Determination of surface resistance to cracking 4.40 Determination of surface resistance to high-low temperature cycle - Method 1 4.41 Determination of surface resistance to high-low temperature cycle - Method 2 4.42 Determination of surface resistance to scratching 4.43 Determination of surface resistance to staining - Method 1 4.44 Determination of surface resistance to staining - Method 2 4.45 Determination of surface resistance to wearing - Method 1 4.46 Determination of surface resistance to wearing - Method 2 4.47 Determination of surface resistance to wearing - Method 3 4.48 Determination of surface resistance to dry heat - Method 1 4.49 Determination of surface resistance to dry heat - Method 2 4.50 Determination of surface resistance to damp heat - Method 1 4.51 Determination of surface resistance to damp heat - Method 2 4.52 Determination of resistance to boiling water 4.53 Determination of impact resistance 4.54 Determination of cracking resistance 4.55 Determination of formability 4.56 Determination of anti-static property 4.57 Determination of adhesion of paint film 4.58 Determination of hardness of paint film 4.59 Determination of formaldehyde content - Perforation method 4.60 Determination of formaldehyde emission - 1m3 climatic box method 4.61 Determination of formaldehyde emission - Desiccator method 4.62 Determination of formaldehyde emission - Gas analysis method 4.63 Determination of formaldehyde emission - Cell method 4.64 Test method for other properties Annex A (Informative) International standards and foreign advanced standards for reference to test methods Annex B (Informative) Diagram of wood failure rate of plywood specimen Annex C (Informative) Diagram of abnormal failure of plywood specimen Annex D (Informative) Xenon arc lamp device Annex E (Informative) Test method for other properties Bibliography