PDF GB/T 14402-2007 English (GB/T 14402-1993: Older version)
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Reaction to fire tests for building materials and products -- Determination of the heat of combustion
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| GB/T 14402-1993 | English | 319 |
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Test method of heat of combustion for building materials
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GB/T 14402-2007: PDF in English (GBT 14402-2007) GB/T 14402-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.40
C 80
GB/T 14402-2007 / ISO 1716:2002
Replacing GB/T 14402-1993
Reaction to Fire Tests for Building Materials and Products -
Determination of the Heat of Combustion
(ISO 1716:2002, IDT)
ISSUED ON: DECEMBER 21, 2007
IMPLEMENTED ON: JUNE 1, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Test Apparatus ... 8
5 Test Specimen ... 13
6 Conditioning ... 16
7 Test Procedure ... 16
8 Expression of Results ... 18
9 Test Report ... 22
10 Validity of Test Results ... 23
Annex A (Normative) Calculation of Net Heat of Combustion ... 24
Annex C (Informative) Calculation of the Corrective Term "c" ... 28
Annex D (Informative) Example of Determination of the Gross Heat of Combustion of
a Non-homogeneous Product ... 29
Foreword
This standard is identical to ISO 1716:2002 "Reaction to Fire Tests for Building Materials and
Products-Determination of the Heat of Combustion" (English version).
To be convenient for use, the following editorial changes are made in this standard:
— "this international standard" is changed into "this standard";
— Replace decimal comma "," with decimal ".";
— Delete the contents and foreword of the international standard.
This standard replaces GB/T 14402-1993 "Test Method of Heat of Combustion for Building
Materials".
Compared with GB/T 14402-1993, this standard has mainly changed the following parts:
— Introduce the concept of substantial component and non-substantial component (see 3.5
and 3.6);
— The test of latent heat of vaporization of water is not required; the gross heat of
combustion tested through bomb method is regarded as the heat of combustion of
materials; if any dispute, the net heat of combustion shall be provided (see Chapter 1);
— Add "cigarette" sample preparation method (see 5.9);
— Add requirements and description for the calculation of heat of combustion of
homogeneous product and non-homogeneous product (see Clause 8);
— Add normative "Calculation of Net Heat of Combustion" (see Annex A);
— Add informative "Precision of Test Method" (see Annex B);
— Add informative "Calculation of the Corrective Term "c"" (see Annex C);
— Add informative "Example of Determination of the Gross Heat of Combustion of a Non-
homogeneous Product" (see Annex D).
Annex A of this standard is normative; Annex B, Annex C and Annex D are informative.
This standard is proposed by the Ministry of Public Security of the People's Republic of China.
This standard is under the jurisdiction of Seventh Subcommittee of National Technical
Committee on Fire Protection of Standardization Administration of China (SAC/TC 113/SC 7).
Drafting organization of this standard: Sichuan Fire Research Institute of Ministry of Public
Security.
Reaction to Fire Tests for Building Materials and Products-
Determination of the Heat of Combustion
1 Scope
This standard specifies a method for the determination of the heat of combustion of building
products at constant volume in a bomb calorimeter.
This standard describes a test method for the measurement of the gross heat of combustion
(PCS). Annex A describes the calculation of the net heat of combustion (PCI) when required.
Information on the precision of the test method is given in Annex B.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute
provisions of this standard. For dated reference, subsequent amendments to (excluding
correction to), or revisions of, any of these publications do not apply. However, all parties
coming to an agreement according to this standard are encouraged to study whether the latest
edition of these documents is applicable. For undated references, the latest edition of the
normative document is applicable to this standard.
ISO 13943 "Fire Safety-Vocabulary"
EN 13238 "Reaction to Fire Tests for Budding Products-Conditioning Procedures and General
Rules for Selection of Substrates"
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in ISO 13943, together with
the following terms and definitions, apply.
3.1
Product
Material, element or component about which information is required.
3.2
Material
4.12.5 Cigarette making paper, which is pre-glued and of minimum dimensions
55mm×50mm with a known heat of combustion. A commercially available cigarette making
paper of 55mm×100mm has been found suitable when cut into two equal pieces.
4.12.6 Firing wire made of pure iron shall be 0.1mm in diameter. Other types of metal wire
may be used, provided that they break under their own tension when the switch is closed on the
firing circuit and the exact heat of combustion for the wire is known. When using a metal
crucible, there shall be no contact between the firing wire and the crucible. It is therefore
advisable to wrap the metal wire with a cotton thread.
4.12.7 A thread made of white cellulosic cotton (see 4.12.6).
5 Test Specimen
5.1 General
A product shall be evaluated through each of its components, taking into account the rules for
non-substantial components. If a non-homogeneous product cannot be delaminated, its
components shall be provided separately. A product can be delaminated when it is possible to
separate one component from another without any part of the other component adhering to the
component to be evaluated.
5.2 Sampling
5.2.1 General
From a representative amount of a homogeneous product, or a component of a non-
homogeneous product, compose a sample from at least five randomly selected parts taken from
across the thickness. A minimum mass of 50g shall be taken from a homogeneous product and
a substantial component of a non-homogeneous product. A minimum mass of 10g shall be taken
for a non-substantial component of a non-homogeneous product.
5.2.2 Loose-fill material
A sample shall be taken at random from the product of a minimum mass of 50g.
5.2.3 Liquid applied products
A sample of a minimum mass of 10g of dried material shall be prepared.
5.3 Determination of surface density
Where required, the surface density of each component of a product shall be determined to an
accuracy of ±0.5% from a minimum area of 250mm×250mm. For liquid applied products, the
dried weight shall be determined.
5.4 Grinding
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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