QB/T 2280-2016 English PDF (QBT2280-2016)

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QB/T 2280-2016: Office furniture. Office chair
QB/T 2280-2016
QB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.140
Y 81
Record Number. 53766-2016
Replacing QB/T 2280-2007
Office Furniture-Office Chair
ISSUED ON. JANUARY 15, 2016
IMPLEMENTED ON. JULY 1, 2016
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terminologies and Definitions... 6 
4 Product Classification ... 8 
5 Requirements ... 9 
6 Test Methods ... 17 
7 Inspection Rules ... 37 
8 Marking, Packaging, Transportation and Storage ... 39 
Appendix A (Normative) 64kg Load Module ... 41 
Appendix B (Normative) Impact Bag ... 42 
Foreword
This standard was drafted according to the rules specified in GB/T 1.1-2009.
This standard supersedes "Office Chair" (QB/T 2280-2007).
Compared with QB/T 2280-2007, this standard has the following major technical
differences in addition to the editorial changes.
-- The standard name was changed to have a better relevance with the standard
names of other office furniture;
-- Normative references were added (see Chapter 2);
-- In the chapter of "Terminologies and Definitions", the terminologies of "revolving
chair", "sliding friction", "trundle friction" and "load bearing members" were
deleted; the definitions of "the lowest seat height" and "the highest seat height"
were modified; the terminologies and definitions of "gas spring" and "nominal
force Fa" were added (see Chapter 3);
-- In the chapter of "Classification", "unadjustable office chair" was modified;
classification by "horizontal rotation mode of office chair" and "framework and
load bearing member material" was deleted (see Chapter 4);
-- In the chapter of "Requirements", the requirements for the following items were
deleted. "seat inclination", "wood material", "leather substance", "various other
materials", "air leg", "water permeability of textile fabric", "salt bath resistance of
metal parts coating", "bonding performance of galvanized coating", "plastic
parts" and "trundle/sliding friction"; the requirements for the following items
were modified. “physical and chemical properties of metal parts coating”, “static
load test on seat and back”, “vertical downward static load on armrest”,
“horizontal static load test on armrest”, “reciprocating abrasion test on castor”,
“static load test on base” and “seat durability test”; the requirements for the
following items were added. “resistance to salt spray of metal parts coating”,
“TVOC” and “safety” (see Chapter 5);
-- In the chapter of "Test Methods", the test methods for the following items were
deleted. "wood material", "leather substance", "various other materials", "air leg",
"water permeability of textile fabric", "salt bath resistance of metal parts coating",
"bonding performance of galvanized coating", "plastic parts" and "trundle/
sliding friction"; the test methods for the following items were modified “physical
and chemical properties of metal parts coating”, “static load test on seat and
back”, “vertical downward static load on armrest”, “horizontal static load test on
armrest”, “reciprocating abrasion test on castor”, “static load test on base” and
“seat durability test”; the test methods for the following items were added.
Office Furniture-Office Chair
1 Scope
This standard specifies the terminologies and definitions, product classification,
requirements, test methods, inspection rules and marking, packaging, transportation
and storage of office chairs.
This standard is applicable to office chairs; chairs of similar uses in other occasions
may refer to this standard.
2 Normative References
The following documents for the application of this document are essential. Any dated
reference, just dated edition applies to this document. For undated references, the
latest edition (including any amendments) applies to this document.
GB/T 2828.1 Sampling Procedures for Inspection by Attributes - Part 1.
Sampling Schemes Indexed by Acceptance Quality Limit (AQL)
for Lot-by-lot Inspection
GB/T 3325-2008 Metal Furniture - General Technical Requirements
GB/T 3920 Textiles - Tests for Colour Fastness - Colour Fastness to Rubbing
GB 5296.6 Instructions for Use of Products of Consumer Interest - Part 6.
Furniture
GB/T 6343 Cellular Plastics and Rubbers - Determination of Apparent
Density
GB/T 6669-2008 Flexible Cellular Polymeric Materials - Determination of
Compression Set
GB/T 6670-2008 Flexible Cellular Polymeric Materials - Determination of
Resilience by Ball Rebound
GB/T 9286 Paints and Varnishes - Cross Cut Test for Films
GB/T 10357.2 Test of Mechanical Properties of Furniture - Part 2. Stability of
Chairs and Stools
GB/T
10357.3-2013
Test of Mechanical Properties of Furniture - Part 3. Strength and
Durability of Chairs and Stools
GB 17927.1 Upholstered Furniture - Assessment of the Resistance to Ignition
of Mattress and Sofa - Part 1. Smouldering Cigarette
GB 17927.2 Upholstered Furniture - Assessment of the Resistance to Ignition
of Mattress and Sofa - Part 2. Match Flame Equivalent
GB/T
18204.2-2014
Examination Methods for Public Places - Part 2. Chemical
Pollutants
GB 18587-2001 Indoor Decorating and Refurbishing Materials-Limitations of
Back eccentric
Distance between a vertical line through forced points at back top and a line through
support points at outermost side of base.
3.7
Soft and rigidity covering frame
Members and parts covered by textile fabric, natural leather and imitation leather.
3.8
The lowest seat height
Height of seat when it is adjusted to the lowest point.
3.9
The highest seat height
Height of seat when it is adjusted to the highest point.
3.10
Lift travel
Difference between the highest seat height and the lowest seat height.
3.11
Gas spring
An elastic element, composed of a sealed cylinder tube, sliding piston and piston
assembly inside, using nitrogen or other inert gas as the medium for storing energy.
3.12
Nominal force
Fa
The sum of the minimum stretching force and the minimum compression force divided
by 2.
Fa=(F1+F3)/2
Where,
5.3.1 Appearance of plastic parts
5.3.1.1 Plastic parts shall be free from crack and obvious deformation.
5.3.1.2 Plastic parts shall be free from obvious shrinkage cavity, bubbles, impurities
and scars.
5.3.1.3 Plastic parts used on the outside surface of chairs shall be smooth and clean,
and free from scratch, stain and visible color difference on the surface.
5.3.2 Appearance of soft and rigidity covering frame
5.3.2.1 Members and sewing shall be free from damage, stain, thread slippage,
open seam or degumming.
5.3.2.2 Members and sewing shall be symmetrical at symmetrical positions. The
sewing stitch shall be uniform without obvious floating thread, skipped stitch. The
pattern shall be clear without washboard effect or visible color difference. *
5.3.2.3 Soft covering frame shall be plump, round, uniform and symmetrical at the
symmetrical positions; the inserted line is smooth and straight. The rigidity covering
frame shall be smooth without wrinkle. *
5.3.2.4 All-in-one foaming parts shall be well combined without shedding, wrinkle or
looseness, etc. The self-curtaining part shall be flat and smooth on the surface without
pit and with a uniform thickness and compact texture; the split gap has no influence
on the appearance.
5.3.3 Appearance requirements of wooden parts
5.3.3.1 Surface wooden parts shall be free from crack, wane, dead knot, moth-eaten
material or slight decayed wood.
5.3.3.2 Surface wood-based panel parts shall be overedged.
5.3.3.3 Overedge and veneer shall be free from swelling and degumming.
5.3.3.4 Overedge or veneer shall be put together tightly and flatly with similar texture
and colors without dents, indentation or obvious glue penetration; the veneer shall be
free from scratch, pit, crack, broken corner or knife cut.
5.3.4 Appearance of metal pieces
5.3.4.1 Metal pieces shall be subjected to rust-proof treatment until no rust stain is
found.
5.3.4.2 Metal pieces shall be free from pipe fittings with unsealed ends. The piping
No. Inspection items Test conditions Requirements Test methods
4. During the test, test
pieces shall not make any
obvious and differentiable
noise;
5. Both lift mechanism
and rotating mechanism
shall not fail;
6. Parts and accessories
such as screw shall be free
from visible looseness
revolving chair
Vertical
downward static
load on armrest
750N, 1min 6.6.4
5 Horizontal static load on armrest 445N, 1min 6.6.5
Reciprocating
abrasion on
castor
Apply 113kg of load vertically on seat, then test
2,000 times on test platform with obstacles and
98,000 times on horizontal test platform without
obstacles.
1. There shall be no loss or
damage of serviceability
after the test;
2. After the test, pull the
castor along the center line
of each castor with a force
of 22 N, the castor shall not
drop
6.6.6
7 Static load on base 7,560N, 1min, 2 times
Structural integrity of the
base shall be free from
damage or sudden obvious
deformation
6.6.7
8 Durability of seat and back
Load on seat 950N, 100,000 times
Back load 330N, 100,000 times
Balanced load on seat. 950 N 1. Chair components are
free from fracture or gap;
2. Loading parts are free
from obvious deformation;
3. Chair structure is free
from looseness;
4. During the test, test
pieces shall not make any
obvious and differentiable
noise;
5. Both lift mechanism
and rotating mechanism
shall not fail;
6. Parts and accessories
such as screw shall be free
from visible looseness
6.6.8 is not
applicable to
revolving chair
Back
reciprocating
durability
Load on seat. 102kg; back load. 445N, 120,000
times
6.6.9.1 is
applicable to
Type I office
chair
Load on seat. 102kg; load on back. 334N; 120,000
times
6.6.9.2 is
applicable to
Type II and
Type III office
chairs
10 Tilt mechanism 300,000 times
6.6.10 is
applicable to
Type I and Type
II office chairs
11 Seat rotating durability
Static load on seat. 102kg, angle of rotation.
(360±10)°; frequency of rotation. 5 times/min~15
times/min; for 120,000 times. If the seat is
adjustable, it may be adjusted respectively to the
6.6.11
5.9.3 High and low temperature resistance
It shall meet the requirements of 6.6 in GB/T 29525-2013.
5.9.4 Cycle life
For the sample subjected to high and low temperature resistance test, after 50,000
times of cycle life (it shall be subject to the actual travel when the travel is not greater
than 60 mm; or else, it is subject to 60 mm) test, the total attenuation of nominal force
Fa of gas spring shall not be greater than 13%.
6 Test Methods
6.1 Precision
Unless otherwise specified, the following measuring precision shall be adopted.
-- Loading force. ±5% of the rated value;
-- Mass. ±1% of the rated value;
-- Dimension. ±1mm;
-- Position precision of loading pad. ±5mm.
6.2 Main dimensions
6.2.1 Determination of Point A
Put a 64 kg-load module (see Appendix A) on the seat with center line as symmetry
plane, ensuring that the center of guiding axle of the main weight is consistent with the
center of the seat's rotation axle. Before the test, the seat shall be loaded before being
unloaded, repeat 5 times.
6.2.2 Determination of Point S
For office chairs with unadjustable back, as shown in Figure 7 a), Point S shall be the
most forward point on the back 170 mm ~220 mm above Point A at the central plane.
For office chairs with adjustable back, as shown in Figure 7 b), Point S shall be the
most protruding point on the back at the central plane 400 mm vertically from the
seat's front edge when the back is inclining from back to front.
distance of 200 mm ~300 mm. Observe if the soft damp cloth or white degreased
gauze has the color of the finished parts.
6.4.2 Other appearance inspections
They shall be inspected by 3 persons under the natural light or approximate natural
light with illuminance within the range of 300 lx ~600 lx (e.g. 40 W daylight lamp), and
assessment result is obtained if at least 2 persons have the same opinions.
6.5 Physical and chemical properties
6.5.1 Flexible polyurethane foam
6.5.1.1 Density
It shall be tested according to the requirements of GB/T 6343.
6.5.1.2 Rebound resilience
It shall be tested according to Method A in GB/T 6670-2008.
6.5.1.3 75% compression set
It shall be tested according to Method A in GB/T 6669-2008 with compression of 75%
± 4%.
6.5.2 Color fastness to dry friction of textile fabric
It shall be tested according to the requirements of GB/T 3920.
6.5.3 Metal parts coating
6.5.3.1 Resistance to salt spray
It shall be tested according to the requirements of QB/T 3826.
6.5.3.2 Adhesive force
It shall be tested according to the requirements of GB/T 9286.
6.5.4 Resistance to salt spray of galvanized coating
It shall be tested according to the requirements of QB/T 3826.
6.6 Mechanical property
6.6.1 Stability
It shall be tested according to the requirements of GB/T 10357.2.
6.6.8 Durability of seat and back
6.6.8.1 Seat durability
It shall be tested according to the requirements of 4.7 in GB 10357.3-2013.
6.6.8.2 Back durability
It shall be tested according to the requirements of 4.8 in GB 10357.3-2013.
Seat durability test and back durability test can be combined into one test as they
have the same loading position and loading period. In each loading/unloading period,
seat shall be loaded before the back is loaded; then unload the back before the seat is
unloaded.
6.6.9 Back reciprocating durability (not applicable to office chair with back height
less than 200 mm)
6.6.9.1 ...