GB/T 20284-2006 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20284-2006 | English | 145 |
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Single burning item test for building materials and products
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GB/T 20284-2006: Single burning item test for building materials and products---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20284-2006
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.40
C 80
Single burning item test for
building materials and products
Issued on. JUNE 2, 2006
Implemented on. NOVEMBER 1, 2006
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Test facility... 6
5 Test specimen... 14
6 Conditioning... 18
7 Principle... 18
8 Test procedure... 18
9 Expression of results... 24
10 Test report... 24
Annex A (Normative) Calculation procedures... 26
Annex B (Informative) Precision of test method... 45
Annex C (Normative) Calibration procedures... 50
Annex D (Informative) Calibration procedures... 63
Annex E (Normative) Design drawings... 67
Annex F (Informative) Data file format... 102
Annex G (Informative) Record sheet... 106
Annex H (Informative) Standardization installation and fixed conditions of
tubular insulation materials... 108
1 Scope
This Standard specifies a method of test for determining the reaction to fire
performance of construction products excluding floorings, and excluding
products which are indicated in the EC Decision 2000/147/EC, when exposed
to thermal attack by a single burning item (SBI). The calculation procedures are
given in annex A. Information on the precision of the test method is given in
annex B. The calibration procedures are given in annexes C and D, of which C
is a normative annex.
NOTE This Standard has been developed to determine the reaction to fire performance
of essentially flat products. The treatment of some families of products, e.g. linear products
(pipes, ducts, cables etc.) need special rules.
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. For dated references,
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 16839.1 Thermocouples - Part 1.Reference tables (GB/T 16839.1-
1997, idt IEC 584-1.1995)
GB/T 6379.1-2004 Accuracy(trueness and precision) of measurement
methods and results - Part 1.General principles and definitions (ISO 5725-
1.1994, IDT)
3 Terms and definitions
For the purposes of this Standard, the terms and definitions in EN ISO 13943
and EN 13501-1 apply, together with the following.
3.1
backing board
calcium silicate panel used to back the specimen that can be placed directly
against a freestanding test specimen or at a distance from it
3.2
specimen
piece of a product, which is to be tested
NOTE This can include the mounting technique used in its end-use application. This also
can include an air gap and/or a substrate where appropriate.
3.3
substrate
product which is used immediately beneath the product about which information
is required
3.4
THR600s
total heat release from the specimen in the first 600 s of exposure to the main
burner flames
3.5
LFS
lateral flame spread on the long specimen wing
NOTE The LFS is defined in more detail in 8.3.3.
4 Test facility
4.1 General
The SBI test facility shall consist of a test room, the test apparatus (trolley, frame,
burners, hood, collector and ducting), the smoke exhaust system and general
measuring equipment.
4.2.1 The test room shall have an inner height of (2.4±0.1) m and an inner
floor area of (3.0±0.2) m in both directions. The walls shall be made of stone
type building blocks (e.g. cellular concrete), gypsum boards, calcium silicate
boards or other boards classified as Euro class A1 or A2.
4.2.4 Both left-orientated arrangements, as shown in Figure 1, and right-
orientated arrangements (the trolley shown in Figure 1 mirrored around a
vertical line) are allowed.
4.3 Materials
Commercial propane, of minimum purity 95%.
4.4 Test apparatus
(See Figures E.1 to E.35 in annex E)
4.4.7 Shield of rectangular shape, width (370 ± 5) mm, height (550 ± 5) mm,
made of calcium silicate board (specification the same as the backing boards),
to protect the specimens from the heat flux of the flames of the auxiliary burner.
It shall be fixed to the hypotenuse side of the auxiliary burner, centered in the
horizontal plane (shielding the total width of the diagonal plus (8 ± 3) mm at
both sides) with the top edge (470 ± 5) mm above the top level of the auxiliary
burner.
4.4.11 Removable panel parts, to allow for additional airflow behind both
specimen wings panels 22 and 25 in Figure E.20 shall be replaced by half
panels, covering only the upper half of the space covered by panels 22 and 25.
Smoke exhaust system
4.5 Smoke exhaust system
4.6 General measurement section equipment
(See Figures E.28 to E.35)
4.6.1 Three thermocouples, all of the K-type in accordance with EN 60584-1,
diameter 0.5 mm, sheathed and insulated. The position of the tips shall be at a
radius of (87±5) mm from the axis and with 120° mutual angular distance.
4.7 Other general equipment
4.7.1 Thermocouple, of the K-type in accordance with EN 60584-1, diameter
(2±1) mm, installed on the outer wall of the testing room within 0.20 m of the
trolley opening and less than 0.20 m above the floor, for measuring the ambient
temperature of the air flow into the test room.
4.7.2 Equipment for measuring the ambient pressure, having an accuracy of
±200 Pa (2 mbar).
4.7.3 Equipment for measuring the relative ambient air humidity, having an
accuracy of ±5 % within the range 20% to 80%.
4.7.4 Data acquisition system (used to record the data automatically) having
an accuracy equal to or better than 100 ppm (0.01%) for O2 and CO2, 0.5°C for
the temperature measurements, 0.01 % of full scale instrument output for all
other instruments and 0.1 s for time.
5 Test specimen
5.1 Dimensions of specimen
5.1.1 The corner specimen consists of two wings, designated the short and
long wings.
5.3.2), the given dimensions refer to the total specimen dimensions.
5.1.2 Specimens with a thickness of more than 200 mm shall be reduced to a
thickness of mm by cutting away the unexposed surface, unless
otherwise specified in the product specification.
5.2 Mounting of specimen
5.2.1 Mounting as in end use application
When products are tested, mounted as in their end use application, the test
results are valid only for that application.
5.3 Installation of the specimen wings in the trolley
5.3.1 The specimen wings shall be placed in the trolley as follows.
5.3.2 The exposed edges of the products and the joint in the corner may be
protected using additional products, if this is in accordance with its end use
application. When additional products are used, the width of the wings including
the additional product shall be in accordance with 5.1.1.
5.3.3 After installation of the specimen on the trolley, the following aspects
shall be photographed.
5.4 Number of specimens
Three specimens (three sets of long plus short wing) shall be tested in
accordance with clause 8.
6 Conditioning
6.1 The conditioning shall be in accordance with EN 13238 and the
requirements of 6.2.
7 Principle
A test specimen, consisting of two vertical wings forming a right-angled corner,
is exposed to the flames from a burner placed at the bottom of the corner (the
“main burner”). The flames are obtained by combustion of propane gas, injected
through a sandbox and give a heat output of (30.7 ± 2.0) kW.
8 Test procedure
8.1 General
Perform the steps in 8.2 in sequence, with the measuring equipment operating
and the trolley with the test specimen and the main burner placed in the frame,
under the hood. The entire testing procedure until the end of the test shall be
carried out within 2 h of removal of the specimen from the conditioning
environment.
8.2 Testing operations
8.2.5 Start the time measurement with the chronometer and the automatic
recording of data. The time of start is t = 0 s. The data to be recorded are given
in 8.4.
8.2.9 At t ≥1560 s.
8.2.10 Record the end of test conditions on the record sheet at least 1 min
after any remaining combustion of the specimen has been totally extinguished.
The data to be recorded are given in 8.3.5.
8.3 Visual observation and manual recording of data
8.3.1 General
The quantities mentioned in this clause shall be observed visually and recorded
in the format given. The observer shall be provided with a chronometer
equipped with an event logger. The observations shall be recorded on a record
sheet, of which an example is given in annex G.
8.3.4 Flaming particles or droplets
The fall of flaming droplets or particles shall be recorded only within the first 600
s of the exposure period and only when the droplets/particles reach the floor
level of the trolley (the level of the lower edge of the specimen) outside the
burner zone. The burner zone is defined as the trolley floor area at the front
side of the specimen wings, less than 0.3 m from the corner line between the
specimen wings, as illustrated in Figure 3.The following occurrences shall be
recorded.
8.4 Automated recording of data
8.4.1 The quantities given in 8.4.2 to 8.4.9 shall be measured and recorded
automatically every 3 s during the period specified in 8.2 and shall be stored for
further processing.
8.4.2 Time (t), in s; at the start of recording of data, t = 0 by definition.
9 Expression of results
9.1 For each test, the burning behavior of the product shall be represented by
graphs of average heat release rate HRRav(t), total heat release THR(t), and
1000 × HRRav(t)/(t-300), for the time interval 0≤ t ≤1500 s;
9.2 For each test, the smoke production behavior of the product shall be given
as the graphs of SPRav(t), total smoke production TSP(t) and 10000 ×
SPRav(t)/(t-300), f
9.3 For each test, the behavior of the product regarding the production of
flaming droplets and particles shall be given as the occurrence, or not, of one
or both categories of fallen flaming droplets and particles, in accordance with
8.3.4 a) or b) respectively.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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