GB/T 6344-2008 PDF in English
GB/T 6344-2008 (GB/T6344-2008, GBT 6344-2008, GBT6344-2008)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 6344-2008 | English | 105 |
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Flexible cellular polymeric materials -- Determination of tensile strength and elongation at break
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| GB/T 6344-1996 | English | 199 |
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Polymeric materials, cellular flexible--Determination of tensile strength and elongation at break
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| GB/T 6344-1986 | English | RFQ |
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Polymeric materials, cellular flexible--Determination of tensile strength and elongation at break
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Standards related to (historical): GB/T 6344-2008
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GB/T 6344-2008: PDF in English (GBT 6344-2008) GB/T 6344-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
G 31
GB/T 6344-2008 / ISO 1798:2008
Replacing GB/T 6344-1996
Flexible cellular polymeric materials – Determination of
tensile strength and elongation at break
(ISO 1798:2008, IDT)
ISSUED ON: AUGUST 19, 2008
IMPLEMENTED ON: MAY 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Apparatus ... 6
5 Test pieces ... 6
6 Procedure ... 8
7 Calculation ... 8
8 Test report ... 9
Foreword
This Standard is identical to the International Standard ISO 1798:2008 Flexible cellular
polymeric materials - Determination of tensile strength and elongation at break. It is
completely identical to ISO 1798:2008 in terms of technical content and text structure,
with only the following editorial changes:
⎯ Delete the Foreword of the International Standard;
⎯ Delete the Table of Contents of the International Standard;
⎯ Delete the general warning terms for laboratory operators in the International
Standard.
This Standard replaces GB/T 6344-1996, Polymeric materials, cellular flexible -
Determination of tensile strength and elongation at break.
Compared with GB/T 6344-1996, the main changes of this Standard are as follows:
⎯ Modify part of Clause 4;
⎯ Delete 4.1 Thickness gauge; add relevant requirements for "Tensile-testing
machine";
⎯ Add Type 1A test pieces to 5.2;
⎯ In 5.4, add relevant provisions that materials shall be tested 16 h or 48 h after
manufacture;
⎯ Change "average tensile strength" to "tensile strength” in 7.1;
⎯ In Formula (1), use "TS” instead of "σt" to represent the tensile strength;
⎯ In Formula (2), use "Eb" instead of "εt" to represent the elongation at break.
This Standard was proposed by China National Light Industry Council.
This Standard shall be under the jurisdiction of National Technical Committee 48 on
Plastic Products of Standardization Administration of China.
Drafting organizations of this Standard: Beijing Technology and Business University,
Gansu Leather and Plastics Research Institute, National Light Industry Plastics Product
Quality Supervision and Inspection Lanzhou Station, Gansu Leather and Plastic Quality
Supervision and Inspection Station, Sinomax Kuka (Zhejiang) Foam Co., Ltd.
Main drafters of this Standard: Lian Qin, Chen Qian, Yuan Liqun, Wang Xiaopeng,
Zhang Dingjun, Qian Hongxiang.
Flexible cellular polymeric materials — Determination of
tensile strength and elongation at break
1 Scope
This Standard specifies a method for determining the strength and deformation
properties of flexible cellular materials when a test piece is extended at a constant rate
until it breaks.
This Standard applies to the testing of tensile strength and elongation at break of flexible
cellular polymeric materials.
2 Normative references
The terms in the following documents become the terms of this Standard by reference
to this Standard. For dated references, all subsequent amendments (not including errata
content) or revisions do not apply to this standard. However, parties to agreements that
are based on this Standard are encouraged to study whether the latest versions of these
documents can be used. For undated references, the latest edition applies to this
Standard.
GB/T 6342, Cellular plastics and rubbers - Determination of linear dimensions
(GB/T 6342-1993, IDT ISO 1923:1981)
ISO 7500-1:2004, Metallic materials - Verification of static uniaxial testing
machines - Part 1: Tension/compression testing machines - Verification of
calibration of the force-measuring system
ISO 9513, Metallic materials - Calibration of extensometer systems used in
uniaxial testing
ISO 23529, Rubber - General procedures for preparing and conditioning test pieces
for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
tensile strength
27 °C ± 2 °C, (65 ± 5) % relative humidity.
5.4.3 In the case of quality-control tests, test pieces can be taken a shorter time (down
to a minimum of 12 h) after manufacture and testing carried out after conditioning for
a shorter period (down to a minimum of 6 h) in one of the atmospheres specified above.
6 Procedure
6.1 After conditioning as specified in 5.4, measure the thickness of the material at five
evenly distributed points in the area from which the test pieces are to be cut. These
measurements shall be made in accordance with GB 6342 (ISO 1923) and shall not vary
from each other by more than ±2%. If desired, thickness measurements can be
performed on cut test pieces, but test pieces whose thickness falls outside these limits
shall be rejected.
6.2 Mark the gauge length on each test piece with two reference lines, using a marker
with two parallel marking edges. Measure the distance between the inside edges of the
lines to an accuracy of ±1% (these lines shall be 25 mm ~ 50 mm apart for type 1 test
pieces and not more than 40 mm apart for type 1A test pieces).
6.3 Set the load-indicating device to zero and place a test piece in the grips of the tensile-
testing machine, taking care to mount the test piece symmetrically so that the tension
will be distributed uniformly over its cross-section. A preload stress of up to 0.1 kPa or
a preload extension of up to 0.5% may be applied. When using an extensometer, zero it
on completion of the preload. Start the machine at a jaw-separation rate of 500 mm/min
± 50 mm/min and record the maximum force (measured to ±1%) and the distance
between the inside edges of the two reference lines (measured to ±1.25 mm)
immediately prior to break of the test piece. Reject test pieces which break outside the
gauge length, and continue testing until five satisfactory results are obtained. Sufficient
material will have to be available to ensure that retesting can be carried out.
6.4 Carry out the test at the same temperature and humidity as that used for conditioning
the test material.
Note: To reduce break times outside the gauge length, type 1A test pieces are
recommended. In the case of the type 1 cutter, the probability of test pieces
being rejected can be minimized by selecting a gauge length close to the
maximum permitted value of 50 mm.
7 Calculation
7.1 Tensile strength
Calculate the average thickness of each test piece.
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Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)
Linkin: https://www.linkedin.com/in/waynezhengwenrui/
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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