GB/T 3324-2024 English PDF (GB/T3324-2024)

GB/T 3324-2024: General technical requirements for wooden furniture
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GB/T 3324-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.140
CCS Y 80
Replacing GB/T 3324-2017
General technical requirements for wooden furniture
ISSUED ON: OCTOBER 26, 2024
IMPLEMENTED ON: MAY 01, 2025
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 9
4 Categories ... 11
5 Requirements ... 11
5.1 Main dimensions and their deviations ... 11
5.2 Shape and position tolerances ... 13
5.3 Material requirements ... 14
5.4 Appearance requirements ... 15
5.5 Physical and chemical properties ... 17
5.6 Mechanical properties ... 19
5.7 Structural safety (basic item) ... 20
5.8 Limited amount of hazardous substances (basic items) ... 21
5.9 Electrical safety (basic item) ... 21
5.10 Flame retardancy (basic item) ... 21
6 Test methods ... 21
6.1 Determination of main dimensions and their deviations ... 21
6.2 Shape and position tolerance measurement ... 21
6.3 Material determination ... 23
6.4 Appearance determination ... 23
6.5 Determination of physical and chemical property ... 24
6.6 Mechanical performance test ... 27
6.7 Structural safety ... 28
6.8 Limited content of hazardous substances ... 28
6.9 Electrical safety ... 28
6.10 Flame retardancy ... 28
7 Inspection rules ... 28
7.1 Inspection classification ... 28
7.2 Exit-factory inspection ... 29
7.4 Rules for determining test results ... 31
7.5 Re-inspection rules ... 31
8 Marking, instructions for use, packaging, transportation and storage ... 31
8.1 Marking... 31
8.2 Instructions for use ... 31
8.3 Packaging ... 32
8.4 Transportation and storage ... 32
Appendix A (Normative) Main parts and product classification of wooden furniture 33
A.1 Main components of wooden furniture ... 33
A.2 Classification by main components of the product ... 33
A.3 Classification by surface finish of main parts of the product ... 33
A.4 Products are classified by use occasion ... 34
Appendix B (Normative) Annual average timber balanced moisture content in
provinces (districts, special zones), municipalities, major cities ... 35
Appendix C (Informative) Standards for commonly used wood-based panels and wood
for furniture name ... 37
References ... 39
General technical requirements for wooden furniture
1 Scope
This document stipulates the requirements, inspection rules and markings, instructions
for use, packaging, transportation and storage of wooden furniture; describes the
corresponding test methods; defines terms and definitions; gives classifications.
This document is applicable to the quality control of wooden furniture design,
production, sales services, inspection and testing.
2 Normative references
The contents in the following documents constitute an indispensable clause in this
document through normative references in the text. Among them, only the version
corresponding to the date is applicable to this file; the latest version (including all
modifications) of the reference files without the date is applicable to this file.
GB/T 250 Textiles - Tests for color fastness - Grey scale for assessing change in
color
GB/T 1043.1 Plastics - Determination of Charpy impact properties - Part 1: Non-
instrumented impact test
GB/T 1927.4-2021 Test methods for physical and mechanical properties of small
clear wood specimens - Part 4: Determination of moisture content
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 3920-2008 Textiles - Tests for color fastness - Color fastness to rubbing
GB/T 4893.1-2021 Test of surface coatings of furniture - Part 1: Determination of
surface resistance to cold liquids
GB/T 4893.2-2020 Test of surface coatings of furniture - Part 2: Determination of
resistance to wet heat
GB/T 4893.3-2020 Test of surface coatings of furniture - Part 3: Determination of
resistance to dry heat
GB/T 4893.4-2023 Test of surface coatings of furniture - Part 4: Determination of
5.8 Limited amount of hazardous substances (basic items)
It shall comply with the corresponding provisions of GB 18584-2024. The testing of
formaldehyde, benzene, toluene, xylene, total volatile organic compounds (TVOC) is
only applicable to indoor wooden furniture products.
5.9 Electrical safety (basic item)
The electrical part in the product shall comply with the relevant provisions of GB
44246-2024.
5.10 Flame retardancy (basic item)
The soft cladding in the product shall comply with the relevant provisions of GB 17927-
2024.
6 Test methods
6.1 Determination of main dimensions and their deviations
The test piece shall be placed on a flat panel or flat ground and measured using a steel
ruler or tape measure with accuracy of no less than level II. The dimensional deviation
is the difference between the product identification value and the measured value.
6.2 Shape and position tolerance measurement
6.2.1 Warpage
Warpage determination instrument with an accuracy of no less than 0.1 mm is used.
Select the panel with the most severe warpage; place the instrument on the diagonal
line of the panel for measurement; use the maximum distance as the measured value of
warpage.
6.2.2 Flatness
A flatness measurement device with an accuracy of no less than 0.01 mm is used. Select
3 panels with the most severe unevenness; measure the distance between the reference
line within a length of 0 mm ~ 150 mm on their surface; use the maximum distance as
the flatness measurement value.
6.2.3 Adjacent edge perpendicularity
Use a steel ruler or steel tape measure with accuracy of no less than level II, to measure
the two diagonal lines and opposite sides of the rectangular panel or frame; the
difference is the measurement value of the adjacent side perpendicularity.
6.2.4 Distance deviation
A distance deviation measurement device with an accuracy of no less than 0.1 mm is
used. During measurement, the maximum distance between the two adjacent surfaces
of the door and the frame or the door and the door, door and drawer, drawer and frame,
drawer and drawer shall be selected. In the adjacent surface, one surface is selected as
the measurement reference surface. The base surface of the appliance is placed on the
measurement base surface. The measurement of the appliance is used to measure
another adjacent surface (and one or more parts are measured along the adjacent
surface). When the measured value is both positive (or negative), the maximum
absolute value is the measured value of distance deviation; when the measured value is
positive or negative, the sum of the maximum absolute value is the measured value of
distance deviation, meanwhile the maximum measured value is the rated value of
distance deviation.
6.2.5 Parting
The measurement is performed using a feeler gauge with an accuracy of no less than
0.01 mm. Before measurement, the drawer or door shall be opened and closed 3 times,
to keep the drawer or door in the closed position. When measuring the drawer parting,
the drawer shall be close to any side, to measure the maximum parting on the other side.
When measuring the door parting, the largest parting shall be measured; the maximum
measured value shall be used as the rating value for the parting.
6.2.6 Foot stability
Place the test piece on a flat plate or on a flat ground; use a feeler gauge with an accuracy
of no less than 0.01 mm, to measure the distance between the foot or bottom surface
and the flat plate; record the maximum value as the measured value.
6.2.7 Sag and swing
Determination is carried out using a steel ruler or steel tape measure with an accuracy
of no less than level II. Place the steel ruler or steel tape measure on the horizontal plane
and side adjacent to the measurement part of the test piece. Extend the test piece out of
two-thirds of the total length. Measure the free sagging of the horizontal side of the
drawer and the left and right swings of the side of the drawer. The measured maximum
value is used as the measured value of sag and swing.
6.5 Determination of physical and chemical property
6.5.1 Physical and chemical properties of paint film coating
6.5.1.1 Test location
Generally, it can be used on the surface of the product horizontal components. When
sampling is difficult, it can also be performed on specimens that are exactly the same
as the sample material and process.
6.5.1.2 Paint film liquid resistance
According to the provisions of GB/T 4893.1-2021, 10% sodium carbonate solution is
used for 24 h; 10% acetic acid solution is used for 24 h. One test area is selected each
for acid resistance and alkali resistance.
6.5.1.3 Damp heat resistance of paint film
According to the provisions of GB/T 4893.2-2020, 20 min, 70 °C. Select 1 test area for
the test.
6.5.1.4 Dry heat resistance of paint film
According to the provisions of GB/T 4893.3-2020, 20 min, 70 °C. Select 1 test area for
the test.
6.5.1.5 Paint film adhesion
According to the provisions of GB/T 4893.4-2023, use the coating cross-cutting method.
Select 1 test area for the test.
6.5.1.6 Cold and hot temperature difference resistance of paint film
According to the provisions of GB/T 4893.7-2013, at high temperature (40 ± 2) °C and
relative humidity (95 ± 3)%, perform it for 1 h. At low temperature (-20 ± 2) °C, perform
it for 1 h, for 3 cycles. Select 1 test area for the test.
6.5.1.7 Paint film wear resistance
According to the requirements of GB/T 4893.8-2023, the number of tests is 60
revolutions. Select 3 test areas for the test.
6.5.1.8 Paint films impact resistance
According to the provisions of GB/T 4893.9-2013, the impact height is 50 mm. Select
1 test area for the test.
6.5.1.9 Paint film yellowing resistance
According to the provisions of QB/T 5660-2021, use the blue wool cloth of level 6.
Select 1 test area for the test.
6.5.2 Physical and chemical performance test of cladding (flexible and overlaid)
6.5.2.1 Testing location
Generally, it can be used on the surface of the product horizontal components.
6.5.2.2 Hot and cold cycle resistance
According to the provisions of 4.40 in GB/T 17657-2022, the number of test pieces is
3.
6.5.2.3 Dry heat resistance
According to the provisions of GB/T 4893.3-2020, perform it for 20 min at 70 °C. Select
1 test area for the test.
6.5.2.4 Damp heat resistance
According to the provisions of GB/T 4893.2-2020, perform it for 20 min at 70 °C. Select
1 test area for the test.
6.5.2.5 Scratch resistance
Load 0.5 N according to the provisions of 4.42 in GB/T 17657-2022. The number of
test pieces is 3.
6.5.2.6 Surface gluing strength
According to the provisions of 4.16 in GB/T 17657-2022, the number of test pieces is
3.
6.5.2.7 Contamination resistance
The measurement is carried out according to the provisions of 4.43 in GB/T 17657-
2022. Category 5 contaminants with the "*" mark are selected as conventional test
pollutants. The test time of acetone and coffee is 16 hours; the test time of the remaining
three is 10 minutes. Select 1 test area for each pollutant for testing.
6.5.2.8 Wear resistance
When the surface decorative layer material is polyvinyl chloride film, it shall follow
the provisions of 4.45 in GB/T 17657-2022. Other surface decorative layers are ground
for 60 revolutions, according to the provisions of GB/T 4893.8-2023.
method described in QB/T 2537-2001. The total mass of the general leather test head is
1000 g, using 500 dry frictions and 250 wet frictions; the total mass of the suede and
similar leather test head is 500 g, using 50 dry frictions and 25 wet frictions.
6.5.5.2 Textile fabric pH
The determination is performed according to the method described in GB/T 7573-2009.
6.5.5.3 Leather pH
The determination is performed according to the method described in QB/T 2724-2018.
6.5.5.4 Adhesion firmness of genuine leather and film leather (moving film leather)
coatings
The measurement is performed according to the method described in GB/T 39452-2020.
Samples are taken on the seat or back of the sample, or samples can also be taken on
the same material as the sample.
6.5.6 Corrosion resistance test of metal handles
The determination is performed according to the method described in QB/T 3826-1999.
6.6 Mechanical performance test
6.6.1 Strength and durability of tables
It is performed according to the provisions of GB/T 10357.1. The test level is selected
according to the applicable conditions; the test level 2 is generally selected.
6.6.2 Strength and durability of chair and stool
Chair and stools are in accordance with the provisions of GB/T 10357.3. The test level
is selected according to the applicable conditions; the test level 3 is generally selected.
6.6.3 Strength and durability of single-layer bed
It is performed according to the provisions of GB/T 41650-2022.
6.6.4 Strength and durability of bunk bed
It is performed according to the provisions of GB/T 24430-2023.
6.6.5 Strength and durability of cabinet
It is performed according to the provisions of GB/T 10357.5-2023.
6.6.6 Table stability
It is performed according to the provisions of GB/T 10357.7.
6.6.7 Stability of chairs and stools
The recliner and rocking chairs are subject to the provisions of GB/T 10357.8; other
chairs and stools are subject to the provisions of GB/T 10357.2.
6.6.8 Cabinet stability
It is performed according to the provisions of GB/T 10357.4-2023. The stability of the
frame is performed with reference to this document.
6.6.9 Bunk bed stability
It is performed in accordance with the provisions of GB/T 24430-2023.
6.7 Structural safety
It is performed in accordance with the provisions of GB 28008-2024.
6.8 Limited content of hazardous substances
It is performed in accordance with the provisions of GB 185...