QB/T 4839-2023 PDF English
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QB/T 4839-2023: PDF in English (QBT 4839-2023) QB/T 4839-2023
QB
LIGHT INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.140
CCS Y81
Replacing QB/T 4839-2015
Upholstered furniture - Form mattress
软体家具 发泡型床垫
ISSUED ON: DECEMBER 20, 2023
IMPLEMENTED ON: JULY 01, 2024
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms, definitions, symbols... 6
4 Product classification ... 7
5 Requirements ... 8
6 Test method ... 10
7 Inspection rules ... 14
8 Marking, instructions for use, packaging, transportation, storage ... 16
References ... 18
Upholstered furniture - Form mattress
1 Scope
This document specifies the requirements for dimensional deviation, fabric, physical
properties, etc. of foam mattresses; describes the corresponding test methods; specifies
the inspection rules, marking, instructions for use, packaging, transportation and
storage; provides symbols and product classifications that facilitate technical provisions.
This document is applicable to the quality inspection and quality determination of foam
mattresses with a thickness of not less than 130 mm; it is used as a reference for foam
mattresses with a thickness of less than 130 mm.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
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 4802.2 Textiles - Determination of fabric propensity to surface fuzzing and to
pilling - Part 2: Modified Martindale method
GB/T 5296.6 Instructions for use of products of consumer interest - Part 6: furniture
GB/T 6344-2008 Flexible cellular polymeric materials - Determination of tensile
strength and elongation at break
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 9345.1-2008 Plastics - Determination of ash - Part 1: General methods
GB/T 9640-2008 Flexible and rigid cellular polymeric materials - Accelerated
ageing tests
GB/T 10807-2006 Flexible cellular polymeric materials - Determination of hardness
(indentation technique)
GB 15979-2002 Hygienic standard for disposable sanitary products
GB 17927 (all parts) Upholstered furniture - Assessment of the resistance to ignition
of mattress and sofa
GB 18401-2010 National general safety technical code for textile products
GB/T 26392 Slow recovery foam - Determination of recovery time
GB/T 33324 Determination of heavy metal content of latex products - Inductively
coupled plasma atomic emission spectrometry
HG/T 5836-2021 Latex mattresses
QB/T 1952.2 Upholstered furniture - Spring mattress
3 Terms, definitions, symbols
3.1 Terms and definitions
The terms and definitions as defined in QB/T 1952.2, as well as the following terms
and definitions, apply to this document.
3.1.1
Foam mattress
A mattress product made of natural latex, synthetic latex, polyurethane and other
materials, which are formed by foaming process as the main core material and
covered with fabric or composite fabric.
3.1.2
Ash content
The incombustible components left after burning of latex or polyurethane materials
in foam mattresses (3.1.1).
3.1.3
Slow rebound polyurethane foam plastics
A polyurethane foam plastic with slow recovery, low rebound, high hysteresis loss
If the product instructions clearly state that the mattress has different hardness, two
mattresses of the same model shall be used and tested on the soft and hard surfaces of
the mattress, respectively.
6.1.2 Measurement accuracy
Unless otherwise specified, the force measurement shall be accurate to ±5%; the mass
measurement shall be accurate to ±0.5%; the size measurement shall be accurate to ±1
mm; the position of the load pad shall be accurate to ±5 mm.
6.1.3 Ground
The ground for the test shall be rigid, horizontal, flat.
6.2 Test device
6.2.1 Side guard
A device used to prevent the test piece from moving but not to limit the test piece from
tipping over. Its height shall not exceed 12 mm. If the test piece has a special structure,
a higher size may be used; however, its maximum height shall be just enough to prevent
the test piece from moving.
6.2.2 Flat plate
The flat plate is used to measure the outer dimensions of the mattress. The
recommended size is 2000 mm × 2400 mm. The surface shall be hard and flat. The
overall flatness tolerance of the flat plate shall be 2 mm/1000 mm.
6.2.3 Aluminum alloy square tube
The cross-sectional dimensions are 40 mm × 40 mm; the wall thickness is 2 mm; the
length is about 3000 mm; the straightness is 2 mm/1000 mm; the mass is (2500 ± 12.5)
g.
6.3 Dimensional deviation
Test according to the method of QB/T 1952.2.
6.4 Diagonal deviation of mattress surface
Tested according to the method of QB/T 1952.2.
6.5 Other appearance and sensory inspection
No.5 ~ 22 (a total of 18 items) in Table 3 shall be inspected under natural light or
approximate natural light, which has an illumination of 300 lx ~ 600 lx; the floating
line length shall be measured with a steel ruler which has an accuracy not less than
Class II. In case of dispute, three people shall jointly inspect; the majority of the same
conclusions shall be the evaluation value.
6.6 Physical and chemical properties of textile fabrics
6.6.1 Anti-pilling performance
The anti-pilling performance shall be measured according to the method of GB/T
4802.2. The test load for woven fabrics is (415 ± 2) g; the test load for knitted fabrics
is (155 ± 1) g.
6.6.2 Color fastness to dry rubbing
Tested according to the method of GB/T 3920-2008.
6.7 Rebound rate
It is measured according to method A of GB/T 6670-2008.
6.8 Compression permanent deformation
Perform a compression permanent deformation test of (75 ± 4)% according to method
A of 7.2 of GB/T 6669-2008 (compression at 70 °C).
6.9 Tensile strength
It is tested according to the method of GB/T 6344-2008; the test speed is (500 ± 50)
mm/min; the specimen thickness is 10 mm ~ 15 mm, type I specimen, effective gauge
length is 50 mm, the number of specimens is 5.
6.10 Change rate of tensile strength after dry heat aging
Perform dry heat aging test according to the method of GB/T 9640-2008; the test
temperature is (105 ± 2) °C, placed for 16 h; then test the tensile strength according to
6.9; calculate the change rate of tensile strength after dry heat aging, the number of
specimens is 5.
6.11 Mass loss after dry heat aging
Take a specimen with a size of 100 mm × 100 mm × 25 mm. Place it in a standard
environment at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5)%, until
constant weight. Weigh it (m0). Then place it in an oven at a temperature of (105 ± 2) °C
for 48 hours. Weigh it (m1). Calculate the mass loss after dry heat aging. The number
of specimens is 5.
The mass loss after dry heat aging is calculated according to formula (1):
6.21 Mite inhibition rate (functional characteristics)
Tested according to the method of QB/T 1952.2.
6.22 Durability
Tested according to the method of QB/T 1952.2.
6.23 Odor
According to the method in 6.7 of GB 18401-2010, test the 6 sides of the specimen
separately.
6.24 Sign
Check whether the product has a sign and whether the content complies with the
provisions of 8.1.
6.25 Instructions for use
Check whether the product has instructions for use and whether the content complies
with the provisions of 8.2.
7 Inspection rules
7.1 Inspection classification
Product inspection is divided into exit-factory inspection and type inspection.
7.2 Exit-factory inspection
7.2.1 Exit-factory inspection items
Exit-factory inspection is an inspection conducted when the product leaves the factory
or is delivered. Serial No.1 ~ 22, 53 ~ 55 (a total of 25 items) in Table 3 are exit-factory
inspection items.
7.2.2 Sampling and group-batching rules
Exit-factory inspection shall be 100% conducted. If it is difficult to conduct 100%
inspection due to large batches, sampling inspection can be implemented. The sampling
inspection method is based on the provisions of GB/T 2828.1-2012, using normal
inspection, one-time sampling plan, general inspection level II, quality acceptance limit
(AQL) of 6.5; the sample size and judgment value are as shown in Table 4.
b) Product quality grade;
o) Main place of use of the product
d) Implementation standard number;
e) Inspection certificate, production date;
f) Chinese manufacturer's name and address;
g) Mite inhibition rate (functional characteristics) (if any).
8.2 Instructions for use
The main contents of the product instructions for use shall comply with the provisions
of GB/T 5296.6. It shall include at least:
a) Product name, model and specifications, implementation standard number;
b) Product quality grade;
c) Main place of use of the product;
d) Types of main materials and parts of use (fabric, composite fabric, padding, core
material);
e) Product use methods and precautions;
f) Product warranty period;
g) Mite inhibition rate (functional characteristics) (if any).
8.3 Packaging
Products shall be packaged to prevent contamination and damage.
8.4 Transportation and storage
8.4.1 During transportation and storage, the product shall be stacked flat to prevent
scratches and local heavy pressure; necessary protection shall be taken to prevent
pollution, insect damage, moisture, sun exposure.
8.4.2 During storage, the products shall be stacked according to category and
specification.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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