GB/T 5455-2014 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 5455-2014 | English | 85 |
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Textile - Burning Behaviour - Determination of Damaged Length, Afterglow Time and Afterflame Time of Vertically Oriented Specimens
| Valid |
| GB/T 5455-1997 | English | 279 |
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Textiles--Burning behaviour--Vertical method
| Obsolete |
| GB/T 5455-1985 | English | RFQ |
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Textile fabrics--Determination of flame resistance--Vertical method
| Obsolete |
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GB/T 5455-2014: Textile - Burning Behaviour - Determination of Damaged Length, Afterglow Time and Afterflame Time of Vertically Oriented Specimens
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
W 04
Replacing GB/T 5455-1997
Textile – Burning Behaviour –
Determination of Damaged Length, Afterglow Time and
Afterflame Time of Vertically Oriented Specimens
Issued on. SEPTEMBER 3, 2014
Implemented on. MARCH 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Application Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Principle... 6
5 Health and Safety of Test Personnel... 6
6 Apparatus and Materials... 6
7 Specimen Preparation... 9
8 Test Conditions... 10
9 Test Procedure... 10
10 Calculation of Results... 11
11 Test Report... 11
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 5455-1997, Textiles – Burning Behavior – Vertical
Method. Compared with GB/T 5455-1997, the major changes of this Standard are as
follows.
-- the standard name is changed into Textile – Burning Behaviour – Determination
of Damaged Length, Afterglow Time and Afterflame Time of Vertically Oriented
Specimens;
-- it modifies the application scope;
-- it deletes two terms, “afterflame” and “afterglow” and adds the term “flame
application time”;
-- it modifies Figure 1 in the original standard;
-- it adds the diagram of specimen holder (see Figure 2);
-- it deletes the control part of 6.1.5 of the original standard;
-- it modifies the description of “gas” (see 6.1.4);
-- it adds the requirements for the hook of weights (see 6.3);
-- it adds oven and dryer (see 6.6 and 6.7);
-- it modifies the dimensions and number of specimens (see 7.1);
-- it adds one conditioning condition for option (see 7.3);
-- it makes 8.1 “test temperature and humidity” of “test procedure” of the original
standard as an independent article (see Article 8);
-- it reserves the main technical content of Article 8.1 “test procedure”, describes
test procedure once again and adds an optional flame application time;
-- it adds the diagram of “damaged length measurement” (see Figure 4);
-- it adds one method for calculating results (see Article 10).
This Standard was proposed by China National Textile and Apparel Council.
This Standard shall be under the jurisdiction of the Basic Technical Subcommittee of
the National Standardization Technical Committee on Steels (SAC/TC 209/ SC 1).
The drafting organizations of this Standard. Chinatesta Textile (Beijing) Testing and
Certification Centre Co., Ltd., Wenzhou Darong Textile Instrument Co., Ltd.
The main drafters of this Standard. Liu Feifei, Xu Lu, Zhang Hui, Chen Jianyong.
The previous editions of the standard replaced by this Standard are as follows.
-- GB/T 5455-1985, GB/T 5455-1997.
Textile – Burning Behaviour –
Determination of Damaged Length, Afterglow Time and
Afterflame Time of Vertically Oriented Specimens
1 Application Scope
This Standard specifies the test method for the determination of burning behaviour
when flame is applied to the bottom edge of textile vertically oriented.
This Standard applies to all types of textiles and products.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
GB/T 6529, Textiles – Standard Atmospheres for Conditioning and Testing
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
afterflame
The time of flame combustion of material after withdrawing ignition source under
specified conditions, expressed in s.
3.2
afterglow time
The time of flameless combustion of material under specified test conditions, after
flame combustion terminates or ignition source is withdrawn if it is originally flameless
combustion, expressed in s.
3.3
damaged length
The maximum length of the damaged material part in the specified direction under
specified test conditions, expressed in cm.
[GB/T 3291.3, Definition 2.157]
4 Principle
Use a flame generated by a specified igniter to apply flame to the middle of the bottom
edge of specimens vertically oriented; and after specified flame application time,
measure afterflame, afterglow and damaged length of specimens.
5 Health and Safety of Test Personnel
The combustion of textile may generate smoke and toxic gas which is harmful to the
health of the operating personnel.
6 Apparatus and Materials
6.1 Vertical burning tester
6.1.1 Vertical burning test chamber. it is made of materials which are resistant to heat
and smoke with the dimensions inside the chamber (329 ± 2) mm × (329 ± 2) mm ×
(767 ± 2) mm.
6.1.2 Specimen holder. it is made of two U-shaped stainless steel plates of 2.0 mm
in thickness, 422 mm in length and 89 mm in width; the dimensions of its inner frame
are 356 mm × 51 mm. See Figure 2.Specimens are fixed in between two plates and
clamped on both sides with clamps.
6.1.3 Igniter. the inner diameter of pipe orifice is 11 mm; pipe head and vertical line
form an angle of 25°. See Figure 3
6.1.4 Gas. select gas in accordance with the conditioning conditions (see 7.3) and
select industrial propane or butane or propane/butane mixed gas for condition A; select
methane of purity not lower than 97% for condition B.
6.2 Medical degreasing cotton.
6.3 Weight. each weight is attached with a hook which is made of steel wire or
stainless steel wire of diameter 1.1 mm and length about 76 mm by bending 13 mm at
the end into an angle of 45°. There are 5 types of weights which are different in mass.
They shall be selected in accordance with Table 1.
6.4 Straight ruler. minimum scale not greater than 1 mm.
6.5 Sealed container.
6.8 Timer. accurate to 0.1 s.
7 Specimen Preparation
7.1 Prepare specimens in accordance with the conditioning conditions (see 7.3).
Condition A. the dimensions are 300 mm × 89 mm; take 5 pcs longitudinally (vertically)
and 5 pcs laterally (horizontally), altogether 10 specimens.
7.2 Sampling location. specimens are cut with a distance at least 100 mm from the
edge; both sides of specimens shall be parallel with the longitudinal and lateral
directions of fabric; the surface of specimens shall be free from contamination and
wrinkling.
7.3 Specimens are conditioned or dried under one of the following conditions.
Condition A. specimens are conditioned under the standard atmospheric conditions
specified in GB/T 6529; conditioned specimens are placed into a sealed container.
Condition B.
8 Test Conditions
Carry out test in the atmospheric environment of temperature 10°C ~ 30°C and relative
humidity 30% ~ 80%.
9 Test Procedure
9.1 Open gas supply valve before closing the front door of test chamber; light up
igniter; adjust the height of flame to make it stabilize at (40 ± 2) mm. Before starting
the first test, the combustion shall continue stably in this state for 1 min at least and
then the flame is put out.
9.3 Close the chamber door; light up igniter; move the flame to make the bottom side
of specimen just above the centre of the flame after the flame become stabilized; ignite
specimens. At this moment, the time from taking specimens out of sealed container or
desiccator shall be within 1 min.
9.4 The time of applying flame to specimens, i.e. flame application time, is subjected
to the conditioning condition selected (see 7.3). 12 s for Condition A; 3 s for Condition
B.
9.5 After flame application time, withdraw igniter and put out flame; meanwhile, open
timer and record afterflame time and afterglow time, accurate to 0.1 s. If any specimen
is burned through, it shall be recorded.
9.6 When a fabric made of molten fibre is to be tested, degreasing cotton of 10 mm
in thickness shall be used to cover the bottom of test chamber, if molten drops are
generated during the combustion of specimens to be tested. Observe whether the
molten drops cause the combustion or afterglow of degreasing cotton and take records.
9.7 Open fan to discharge the smoke generated in the test.
9.8 Open test chamber; take out specimens; fold specimens to form a straight line
from the highest point within the damaged area along the lengthwise direction of
specimens.
9.9 Remove debris from test chamber; turn off fan; then test another specimen.
10 Calculation of Results
In accordance with the conditioning conditions, the calculation results are as follows.
Condition A.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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