GB/T 10707-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 10707-2008 | English | 145 |
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Rubber - Determination of the burning
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| GB/T 10707-1989 | English | 519 |
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Rubber--Determination of flammability by oxygen index
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GB/T 10707-2008: Rubber - Determination of the burning---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/GBT10707-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.01
G 40
Replacing GB/T 10707-1989, GB/T 13488-1992
Rubber - Determination of the burning
Issued on. JUNE 04, 2008
Implemented on. DECEMBER 01, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Methods A - Oxygen index method... 6
4.1 Principle of test... 6
4.2 Test device... 6
4.3 Specimen... 8
4.4 Test procedure... 8
4.5 Calculation of results... 10
4.6 Test report... 12
5 Method B - Vertical burning method... 12
5.1 Principle of test... 12
5.2 Test device... 12
5.3 Specimen... 13
5.4 Test procedure... 14
5.5 Calculation of results... 15
5.6 Evaluation of results... 16
5.7 Test report... 17
Appendix A (Normative) Calculation of oxygen concentration... 18
Appendix B (Informative) Relationship between oxygen concentration and
oxygen, nitrogen flow rate... 19
Appendix C (Informative) Calculation example of test result... 24
Appendix D (Informative) Schematic diagram of a Bunsen lamp with scaled pole
... 26
Foreword
This standard replaces GB/T 10707-1989 “Rubber - Determination of
flammability by oxygen index” and GB/T 13488-1992 “Rubber - Determination
of the burning behavior of vertical specimens”.
The main technical differences between this standard and GB/T 10707-1989
“Rubber - Determination of flammability by oxygen index” and GB/T 13488-
1992 “Rubber - Determination of the burning behavior of vertical specimens”
are as follows.
- ADD clause 3 “Terms and definitions”;
- In clause 5.4.3, ADJUST the distance between the lamp holder and the
lower end of the specimen from 10 mm to 10 mm ± 1 mm; in clauses 5.4.3
and 5.4.4, ADJUST the flame time applied from 10 s to 10 s ± 5 s;
- For the number of specimens in the oxygen index method, CHANGE it from
“at least 15 specimens” into that “for the rubber materials with a known
oxygen index value range within ± 2, it shall prepare 15 specimens; for the
rubber materials with unknown oxygen index or unstable burning features,
prepare 15 ~ 30 specimens”;
- In clause 5.3.1 Vertical burning method, CHANGE the specimen size from
the original “length 130 mm ± 3 mm, width 13.0 mm ± 0.3 mm, thickness
3.0 mm ± 0.2 mm” into “length 130 mm ± 5 mm, width 13.0 mm ± 0.5 mm,
thickness 3.0 mm ± 0.25 mm”;
- MODIFY the formula (1);
- ADD the content of informative Appendix D.
Appendix A of this standard is normative; Appendix B, Appendix C and
Appendix D are informative.
This standard was proposed by the China Petroleum and Chemical Industry
Association.
This standard shall be under the jurisdiction of the National Rubber and Rubber
Products Standardization Technical Committee Sealing Products
Subcommittee (SAC/TC 35/SC 3).
Drafting organizations of this standard. Northwest Rubber Plastics Research
and Design Institute, Anhui Zhongding Sealing Parts Co., Ltd., Zhuzhou Times
New Material Technology Co., Ltd., Zhejiang Quality and Technical Supervision
and Testing Institute.
The main drafters of this standard. Dong Xiaowu, Chen Jinyang, Wang Jin,
Shen Zhen.
This standard replaces the standard previously issued as follows.
- GB/T 10707-1989;
- GB/T 13488-1992.
Rubber - Determination of the burning
1 Scope
This standard specifies two methods for determining the burning properties of
rubber in a laboratory environment. the oxygen index method (method A) and
the vertical burning method (method B).
This standard is applicable to evaluate the burning properties and flame-
retardant properties of rubber materials in a laboratory environment. It is not
suitable to evaluate the fire hazard of rubber materials under actual use
conditions.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard;
however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 2941-2006 Rubber - General procedures for preparing and
conditioning test pieces for physical test methods (ISO 23529.2004, IDT)
GB/T 3863 Industrial oxygen
3 Terms and definitions
The terms and definitions as established by HG/T 3095 as well as the following
terms and definitions apply to this standard.
4 Methods A - Oxygen index method
4.1 Principle of test
The specimen is vertically supported in a transparent burning cylinder, which
has an upward flowing mixed-gas of oxygen and nitrogen.
4.2 Test device
The test device is as shown in Figure 1.
4.2.1 Burning cylinder. A heat-resistant transparent glass cylinder that can
stand upright on the base. Its inner diameter is 75 mm and the total height is
450 mm, to ensure the airflow velocity in the cylinder is 40 mm/s ± 10 mm/s.
4.2.2 Specimen holder. A clip that holds the specimen vertically at the axial
center of the burning cylinder.
4.2.3 Gas source. Oxygen shall meet the requirements of GB/T 3863; nitrogen
shall meet the requirements of GB/T 3864.
4.2.4 Gas measurement and control system. It consists of pressure gauge,
regulating valve, rotameter (the minimum scale of oxygen and nitrogen
rotameter is 0.05 L/min).
4.2.5 Ignitor. A tube that projects into the burning cylinder to ignite the specimen.
The nozzle has a diameter of 2 mm ± 1 mm. Gas can be selected from propane,
butane, liquefied petroleum gas, natural gas, etc., based on actual conditions.
The length of the flame ejected vertically downward from the nozzle during
burning is 16 mm ± 4 mm.
4.2.6 Timer. A stopwatch with a minimum scale value of 0.1 s or other equivalent
timing device.
4.4 Test procedure
4.4.1 Check the test device to ensure it is in good condition. The burning
cylinder should be placed vertically. The specimen is clamped vertically on the
specimen holder at the center of the cylinder. The top of the specimen is at least
100 mm from the cylinder mouth.
4.4.5 Burning features are evaluated as follows.
4.4.5.1 If the specimen burns for less than 180 s or the flame self-extinguishes
before it burns to the 50 mm mark, it is recorded as the feature “0”, meanwhile
the burning time and burning length are recorded.
4.4.5.2 If the specimen burns for more than 180 s or it burns beyond the 50 mm
mark, it is recorded as the feature “X”, meanwhile extinguish the specimen.
4.4.5.3 If there are phenomena such as droplets, caking, unstable burning,
smoldering, etc., they are also recorded as burning features.
4.4.11 Calculate the estimated standard deviation σ of the oxygen
concentration (including cf) which is used in the last 6 specimens (see 4.5.3). If
the following relationship holds.
4.5.2 Determination of k value
The k value and its positive-negative sign are dependent on the features of the
specimen, which can be determined from Table 1 as follows.
4.5.2.1 If the feature “0” is obtained by the test in 4.4.8, then the first opposite
feature (see 4.4.9) shall be “X”. From the last four feature arrangements per
row in the first column of Table 1, find the row that is exactly the same as the
feature arrangement as obtained in 4.4.10.Then, based on the number of
features “0” as obtained in 4.4.8 and 4.4.9, find the column with the same
number from the row (a). The intersection of rows and columns is the calculated
k value.
5 Method B - Vertical burning method
5.1 Principle of test
The specimen is vertically clamped on the holder, the lower end is burned in a
specified flame for a certain period of time, then move away the flame,
meanwhile measure the burning behaviors such as the duration of flame
burning and the flameless burning, to evaluate the burning property grade of
the specimen.
5.2 Test device
The test device is shown in Figure 2.
5.2.1 Bunsen burner. Tube length 80 mm ~ 100 mm, inner diameter 9.5 mm ±
0.5 mm.
5.5 Calculation of results
5.5.1 Calculation of the flame burning time of a group of specimens.
5.6 Evaluation of results
5.6.1 The vertical burning property of rubber material is divided into three
grades. FV-0, FV-1 and FV-2, as shown in Table 2.
5.7 Test report
The test report shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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